CHLD-3301.793 Introductory Statistics WEEK 1-7 brand new version
with correct answers and complete questions graded a+\\ 2026\\
pass!!
Lowering the alpha level from .05 to .01 will increase the power of a statistical test. -
answer-False
In a two-sample ______________design, either the same subjects (participants) are
tested in one condition and then retested in the other condition, or the subjects in one
condition are equated or matched with a specific subject in the other condition. -
answer-Dependent
A Type II error (or beta error) is defined as ________________. -answer-Failing to
reject a false null hypothesis
A researcher measures persons "Social Status" in terms of low, moderate and high
levels. Here, "Social Status" is an example of a(n) -answer-Variable
A researcher risks a Type I error (or alpha error) ________________. -answer-anytime
Ho is rejected
The hypothesis testing procedure consists of a series of steps to help you decide which
one of two competing hypotheses is more likely correct. One of these hypotheses is
called the null hypothesis and the second is called the ___________________
hypothesis. -answer-alternate
The power of a statistical test is the probability of _________________. -answer-
rejecting a false null hypothesis
You believe that eating 5 pixie sticks in a row will increase a 10-year old's hyperactivity
behavior within 30 minutes after consumption. Which of the following is an example of
an appropriate alternate hypothesis? -answer-Eating 5 pixie sticks increases
hyperactivity levels in ten-year-old children.
A worker at your local health food store tells you that research shows that large doses
of vitamin C helps prevent the common cold. You decide you're going to test this claim.
,Which of the following is an example of an appropriate alternate hypothesis? -answer-
Large doses of vitamin C reduces the chance of catching a cold
You have a face-to-face statistics class in the traditional classroom setting. There are 25
males and 45 females enrolled. You're the instructor so you like to arrive in the
classroom before the first students arrive. What is the probability that the first student
who arrives is a male? Round to the nearest tenth or hundredths place. -answer-p=36
A medical researcher is investigating the claim that the mean body temperature of 17
year old females is different from the norm of 98.6 degrees. Which of the following is an
example of an appropriate alternate hypothesis? -answer-17 year old female body
temperature differs from the 98.6 degree norm
You have a jar with ten gumballs. Five are red, three are white, and two are green. You
pick two gumballs in a row. After picking the first gumball you place it back into the jar
and then select your second gumball. What is the probability, p, of drawing a white and
then a green gumball? Round to the nearest hundredths place if a fraction. -answer-
p=.06
An athletic coach is interested in the effects of smoking cigarettes on physical
endurance. Which of the following is an example of an appropriate alternate
hypothesis? -answer-smoking affects endurance
You have 30 marbles, five are blue, seven are red, three are white, and 15 are green.
You pick one marble at random. Which color of marble has the lowest likelihood of
being picked on that single draw? -answer-white
You have one hundred students in an underwater basket weaving course: 70 are
freshmen, 15 are sophomores, 10 are juniors, and 5 are seniors. You pick one student
at random from the roster and he/she is a freshman. What is the probability, p, of
drawing a freshman student? Round to either the nearest tenths or hundredths place if
a fraction. -answer-.70
You have a sample of 110 students of which 75 are freshmen, 15 are sophomores, 10
are juniors, and 10 are seniors. You pick one student at random from the roster and
he/she is a senior. What is the probability, p, of drawing a senior student? Round to the
hundredths place if a fraction. -answer-.09
When untreated during their lifetimes, a certain strain of cancer susceptible rats has an
average lifespan of 134 days. To determine the effects of a new potentially cancer-
retarding drug, a new study is being conducted. In this study, which of the following is
an example of an appropriate alternate hypothesis? -answer-the new drug will increase
the lifespan of rats
With a two-tailed hypothesis test, HA is that the mean from which your sample was
drawn is equal to one specific value. -answer-False
,The sampling distribution of the mean (or sampling distribution for short) consists of a
distribution of ____________. -answer-the means of many equal sized samples drawn
from the population
If one actually selected many samples from a population and calculated the sample
means, the resulting sampling distribution is referred to as a(n) __________ sampling
distribution -answer-empirical
If the obtained sample mean falls in the region of rejection, then your decision in Step 4
of the hypothesis testing process should be to retain H0. -answer-false
For a two-tailed test with = .05, you should reject H0 if the ____________ of the
calculated z score (or calculated t score) is greater than the critical value of z (or t) -
answer-absolute value
The numerator of the z test formula measures ________________. -answer-the actual
difference between M and u
A population is known to have a mean of = 50. A treatment is expected to decrease
scores for individuals in this population. The treatment effect will be evaluated using a
one-tailed hypothesis test. Which of the following is the correct statement of the
alternate hypothesis, HA? -answer-u<50
A researcher administers a treatment to a sample of n = 25 participants and uses the z
test to evaluate the effect of the treatment. The hypothesis test produces a calculated z
= 2.37. The critical value of z* is 2.58 for a two tailed test with = .01. What is the
appropriate decision to be made in Step 4 of the hypothesis testing procedure? -
answer-retain Ho
According to the Central Limit Theorem, the value of the mean of the sampling
distribution of the mean is the population mean, µ. -answer-true
A researcher is conducting an experiment to evaluate a treatment that is expected to
increase the scores for individuals in a population that is known to have a mean of = 80.
The results will be examined using a one-tailed hypothesis test. Which of the following
is the correct statement of the null hypothesis, H0? -answer-u less than or equal to
eighty
A sleep researcher hypothesizes that college students who are deprived of sleep will
perform significantly lower on tests of cognitive ability than the general student body
who likely slept around eight hours. One standardized test of cognitive ability, called the
STCA, reveals that mean score for college students who slept around eight hours is µ =
4.5. Scores on the STCA range from 1-9 with high scores indicating better performance.
The researcher brings 15 volunteer participants into the sleep lab one night and limits
, their sleep to four hours. The next morning he administers the STCA. Their scores are
below.
2, 3, 3, 2, 5, 3, 3, 3, 6, 7, 2, 5, 4, 3, 4
Which of the following are the correct statements of the null and alternate hypotheses? -
answer-H0: µ ≥ 4.5 and HA: µ < 4.5
A researcher believes that a common over-the-counter medication for arthritis, Advil, will
have a negative effect on driving ability when administered in high doses. You ask a
group of seven adults who have arthritis and use Advil to participate in a driver
simulation task while under the influence of a high amount of Advil. You record the
following braking times (in seconds) required to stop upon seeing a car stopped ini the
same lane in front of them. You expect the Advil drivers to have significantly retarted or
slower (hence longer braking times, or increased braking times) braking times than the
normative group. The mean braking time on this task for persons with arthritis who have
not self-administered Advil or other drugs is μ = 0.7 seconds. Remember, higher
braking time scores mean that the individual is "slow", and the researcher expects Advil
will slow braking times.
Braking times (in seconds)
1.2
1.0
1 -answer-4.99
An administrator in charge of undergraduate education at UT Permian Basin wanted to
know whether the number of books that professors require of students per course has
changed in Spring semester as compared to the previous Spring semester a year ago.
The administrator knows that a year ago in Spring the mean number of books that
instructors required per course was normally distributed with μ = 2.2 and σ = 0.6. With a
sample of N = 15 classes this current Spring semester, the administrator obtained the
following number of books that a professor required per class:
1, 3, 0, 2, 1, 5, 4, 2, 2, 7, 1, 1, 2, 2, 3
Set your alpha level at = .01, and summarize the results of the hypothesis testing
procedure by putting your results in journal form. Ignore the minus sign if your
calculated z or t is negative. -answer-z = 1.29, p > .01
A researcher knows that the weights of 3-year old children are normally distributed with
µ = 40 pounds and ơ = 8. She speculates that children in poverty-stricken regions are
undernourished and therefore underweight. With a sample of N = 12 children in a
poverty-stricken zone of a large metropolitan city, the researcher obtained the weights
with correct answers and complete questions graded a+\\ 2026\\
pass!!
Lowering the alpha level from .05 to .01 will increase the power of a statistical test. -
answer-False
In a two-sample ______________design, either the same subjects (participants) are
tested in one condition and then retested in the other condition, or the subjects in one
condition are equated or matched with a specific subject in the other condition. -
answer-Dependent
A Type II error (or beta error) is defined as ________________. -answer-Failing to
reject a false null hypothesis
A researcher measures persons "Social Status" in terms of low, moderate and high
levels. Here, "Social Status" is an example of a(n) -answer-Variable
A researcher risks a Type I error (or alpha error) ________________. -answer-anytime
Ho is rejected
The hypothesis testing procedure consists of a series of steps to help you decide which
one of two competing hypotheses is more likely correct. One of these hypotheses is
called the null hypothesis and the second is called the ___________________
hypothesis. -answer-alternate
The power of a statistical test is the probability of _________________. -answer-
rejecting a false null hypothesis
You believe that eating 5 pixie sticks in a row will increase a 10-year old's hyperactivity
behavior within 30 minutes after consumption. Which of the following is an example of
an appropriate alternate hypothesis? -answer-Eating 5 pixie sticks increases
hyperactivity levels in ten-year-old children.
A worker at your local health food store tells you that research shows that large doses
of vitamin C helps prevent the common cold. You decide you're going to test this claim.
,Which of the following is an example of an appropriate alternate hypothesis? -answer-
Large doses of vitamin C reduces the chance of catching a cold
You have a face-to-face statistics class in the traditional classroom setting. There are 25
males and 45 females enrolled. You're the instructor so you like to arrive in the
classroom before the first students arrive. What is the probability that the first student
who arrives is a male? Round to the nearest tenth or hundredths place. -answer-p=36
A medical researcher is investigating the claim that the mean body temperature of 17
year old females is different from the norm of 98.6 degrees. Which of the following is an
example of an appropriate alternate hypothesis? -answer-17 year old female body
temperature differs from the 98.6 degree norm
You have a jar with ten gumballs. Five are red, three are white, and two are green. You
pick two gumballs in a row. After picking the first gumball you place it back into the jar
and then select your second gumball. What is the probability, p, of drawing a white and
then a green gumball? Round to the nearest hundredths place if a fraction. -answer-
p=.06
An athletic coach is interested in the effects of smoking cigarettes on physical
endurance. Which of the following is an example of an appropriate alternate
hypothesis? -answer-smoking affects endurance
You have 30 marbles, five are blue, seven are red, three are white, and 15 are green.
You pick one marble at random. Which color of marble has the lowest likelihood of
being picked on that single draw? -answer-white
You have one hundred students in an underwater basket weaving course: 70 are
freshmen, 15 are sophomores, 10 are juniors, and 5 are seniors. You pick one student
at random from the roster and he/she is a freshman. What is the probability, p, of
drawing a freshman student? Round to either the nearest tenths or hundredths place if
a fraction. -answer-.70
You have a sample of 110 students of which 75 are freshmen, 15 are sophomores, 10
are juniors, and 10 are seniors. You pick one student at random from the roster and
he/she is a senior. What is the probability, p, of drawing a senior student? Round to the
hundredths place if a fraction. -answer-.09
When untreated during their lifetimes, a certain strain of cancer susceptible rats has an
average lifespan of 134 days. To determine the effects of a new potentially cancer-
retarding drug, a new study is being conducted. In this study, which of the following is
an example of an appropriate alternate hypothesis? -answer-the new drug will increase
the lifespan of rats
With a two-tailed hypothesis test, HA is that the mean from which your sample was
drawn is equal to one specific value. -answer-False
,The sampling distribution of the mean (or sampling distribution for short) consists of a
distribution of ____________. -answer-the means of many equal sized samples drawn
from the population
If one actually selected many samples from a population and calculated the sample
means, the resulting sampling distribution is referred to as a(n) __________ sampling
distribution -answer-empirical
If the obtained sample mean falls in the region of rejection, then your decision in Step 4
of the hypothesis testing process should be to retain H0. -answer-false
For a two-tailed test with = .05, you should reject H0 if the ____________ of the
calculated z score (or calculated t score) is greater than the critical value of z (or t) -
answer-absolute value
The numerator of the z test formula measures ________________. -answer-the actual
difference between M and u
A population is known to have a mean of = 50. A treatment is expected to decrease
scores for individuals in this population. The treatment effect will be evaluated using a
one-tailed hypothesis test. Which of the following is the correct statement of the
alternate hypothesis, HA? -answer-u<50
A researcher administers a treatment to a sample of n = 25 participants and uses the z
test to evaluate the effect of the treatment. The hypothesis test produces a calculated z
= 2.37. The critical value of z* is 2.58 for a two tailed test with = .01. What is the
appropriate decision to be made in Step 4 of the hypothesis testing procedure? -
answer-retain Ho
According to the Central Limit Theorem, the value of the mean of the sampling
distribution of the mean is the population mean, µ. -answer-true
A researcher is conducting an experiment to evaluate a treatment that is expected to
increase the scores for individuals in a population that is known to have a mean of = 80.
The results will be examined using a one-tailed hypothesis test. Which of the following
is the correct statement of the null hypothesis, H0? -answer-u less than or equal to
eighty
A sleep researcher hypothesizes that college students who are deprived of sleep will
perform significantly lower on tests of cognitive ability than the general student body
who likely slept around eight hours. One standardized test of cognitive ability, called the
STCA, reveals that mean score for college students who slept around eight hours is µ =
4.5. Scores on the STCA range from 1-9 with high scores indicating better performance.
The researcher brings 15 volunteer participants into the sleep lab one night and limits
, their sleep to four hours. The next morning he administers the STCA. Their scores are
below.
2, 3, 3, 2, 5, 3, 3, 3, 6, 7, 2, 5, 4, 3, 4
Which of the following are the correct statements of the null and alternate hypotheses? -
answer-H0: µ ≥ 4.5 and HA: µ < 4.5
A researcher believes that a common over-the-counter medication for arthritis, Advil, will
have a negative effect on driving ability when administered in high doses. You ask a
group of seven adults who have arthritis and use Advil to participate in a driver
simulation task while under the influence of a high amount of Advil. You record the
following braking times (in seconds) required to stop upon seeing a car stopped ini the
same lane in front of them. You expect the Advil drivers to have significantly retarted or
slower (hence longer braking times, or increased braking times) braking times than the
normative group. The mean braking time on this task for persons with arthritis who have
not self-administered Advil or other drugs is μ = 0.7 seconds. Remember, higher
braking time scores mean that the individual is "slow", and the researcher expects Advil
will slow braking times.
Braking times (in seconds)
1.2
1.0
1 -answer-4.99
An administrator in charge of undergraduate education at UT Permian Basin wanted to
know whether the number of books that professors require of students per course has
changed in Spring semester as compared to the previous Spring semester a year ago.
The administrator knows that a year ago in Spring the mean number of books that
instructors required per course was normally distributed with μ = 2.2 and σ = 0.6. With a
sample of N = 15 classes this current Spring semester, the administrator obtained the
following number of books that a professor required per class:
1, 3, 0, 2, 1, 5, 4, 2, 2, 7, 1, 1, 2, 2, 3
Set your alpha level at = .01, and summarize the results of the hypothesis testing
procedure by putting your results in journal form. Ignore the minus sign if your
calculated z or t is negative. -answer-z = 1.29, p > .01
A researcher knows that the weights of 3-year old children are normally distributed with
µ = 40 pounds and ơ = 8. She speculates that children in poverty-stricken regions are
undernourished and therefore underweight. With a sample of N = 12 children in a
poverty-stricken zone of a large metropolitan city, the researcher obtained the weights
