STATS EXAM 2 QUESTIONS ANSWERED CORRECTLY LATEST UPDATE 2026
The group you actually collect data from for your study is known as the __________. - Answers
Sample
A statement that postulates a relationship between variables is referred to as a ____. - Answers
Research hypothesis
What type of hypothesis posits a difference between groups where the difference is specified? -
Answers Directional Hypothesis
Which of the following is an example of a nondirectional hypothesis? - Answers There is a
relationship between a high-fat diet and weight gain.
The null hypothesis refers to the ______, whereas the research hypothesis refers to the ______. -
Answers population/sample
Optimally, it is possible to generalize you results from ________ to _________. - Answers your
sample/a larger population
Null hypotheses refer to the following: - Answers The population
In order to help ensure generalizability, which of the following should be true about your sample? -
Answers It is representative
A hypothesis is best defined as - Answers An educated guess
A smaller difference between the sample statistic and the population parameter means that you will
have: - Answers Lower sampling error
If there is no difference between sample and population values, you will have: - Answers No sampling
error
Research hypotheses refer to the following: - Answers The sample
Which of the following is a nondirectional test? - Answers A two-tailed test
Which of the following is a directional test? - Answers one-tailed test
A sample is BEST defined as _____. - Answers a smaller group selected from a given population
Which of the following is a measure of how well a sample approximates the characteristics of a
population? - Answers Sampling error
Which of the following is an example of a directional hypothesis? - Answers There is a positive
relationship between a high-fat diet and weight gain.
Which of the following means "before the fact"? - Answers a priori
Which test would you want to use to test a nondirectional research hypothesis? - Answers Two-tailed
test
If you were to hypothesize that test scores from classroom A will be higher than test scores from
classroom B, you have a: - Answers Directional research hypothesis
What two scores would divide a normal distribution such that 64.26% of the general population falls
within them if the mean is 100 and the standard deviation is 15? - Answers 85 to 115
What is the basis for the normal curve? - Answers probability
When we want to infer from a sample to the population, what assumption must be met? - Answers
Population is normally distributed
In a distribution with a mean of 100 and a standard deviation of 15, what is the probability that a
score will be 115 or higher? - Answers 16%
The percentage of scores fall on either side of the distribution: - Answers 50%
Under the normal curve, approximately what percent of scores fall between -1 and -2 standard
deviations below the mean? - Answers 14%
What characteristic of the normal curve deals with skewness? - Answers Mean, median, and mode
To calculate a z-score, you: - Answers subtract the mean from the raw score, and divide this
difference by the standard deviation
What is the T-score for a Z-score of -1? - Answers 40
Under the normal curve, if a z score of 1.65 included 45% of the area above the mean, what percent
remains above 1.65 on the X axis? - Answers 5%
If a distribution has a mean of 25 and a standard deviation of 2, what value would -4 standard
deviations from the mean? - Answers 17
If a distribution had a mean of 1000 and a standard deviation of 100, how many standard deviations is
600 from the mean? - Answers -4
If you want to calculate a z score for a test where your raw score was 24, what other information
must you know? - Answers Mean and standard deviation
The group you actually collect data from for your study is known as the __________. - Answers
Sample
A statement that postulates a relationship between variables is referred to as a ____. - Answers
Research hypothesis
What type of hypothesis posits a difference between groups where the difference is specified? -
Answers Directional Hypothesis
Which of the following is an example of a nondirectional hypothesis? - Answers There is a
relationship between a high-fat diet and weight gain.
The null hypothesis refers to the ______, whereas the research hypothesis refers to the ______. -
Answers population/sample
Optimally, it is possible to generalize you results from ________ to _________. - Answers your
sample/a larger population
Null hypotheses refer to the following: - Answers The population
In order to help ensure generalizability, which of the following should be true about your sample? -
Answers It is representative
A hypothesis is best defined as - Answers An educated guess
A smaller difference between the sample statistic and the population parameter means that you will
have: - Answers Lower sampling error
If there is no difference between sample and population values, you will have: - Answers No sampling
error
Research hypotheses refer to the following: - Answers The sample
Which of the following is a nondirectional test? - Answers A two-tailed test
Which of the following is a directional test? - Answers one-tailed test
A sample is BEST defined as _____. - Answers a smaller group selected from a given population
Which of the following is a measure of how well a sample approximates the characteristics of a
population? - Answers Sampling error
Which of the following is an example of a directional hypothesis? - Answers There is a positive
relationship between a high-fat diet and weight gain.
Which of the following means "before the fact"? - Answers a priori
Which test would you want to use to test a nondirectional research hypothesis? - Answers Two-tailed
test
If you were to hypothesize that test scores from classroom A will be higher than test scores from
classroom B, you have a: - Answers Directional research hypothesis
What two scores would divide a normal distribution such that 64.26% of the general population falls
within them if the mean is 100 and the standard deviation is 15? - Answers 85 to 115
What is the basis for the normal curve? - Answers probability
When we want to infer from a sample to the population, what assumption must be met? - Answers
Population is normally distributed
In a distribution with a mean of 100 and a standard deviation of 15, what is the probability that a
score will be 115 or higher? - Answers 16%
The percentage of scores fall on either side of the distribution: - Answers 50%
Under the normal curve, approximately what percent of scores fall between -1 and -2 standard
deviations below the mean? - Answers 14%
What characteristic of the normal curve deals with skewness? - Answers Mean, median, and mode
To calculate a z-score, you: - Answers subtract the mean from the raw score, and divide this
difference by the standard deviation
What is the T-score for a Z-score of -1? - Answers 40
Under the normal curve, if a z score of 1.65 included 45% of the area above the mean, what percent
remains above 1.65 on the X axis? - Answers 5%
If a distribution has a mean of 25 and a standard deviation of 2, what value would -4 standard
deviations from the mean? - Answers 17
If a distribution had a mean of 1000 and a standard deviation of 100, how many standard deviations is
600 from the mean? - Answers -4
If you want to calculate a z score for a test where your raw score was 24, what other information
must you know? - Answers Mean and standard deviation
