UCF QMB 3200 UPDATED EXAMS SCRIPT ALL
QUESTIONS AND ANSWERS SURE A+
✔✔The probability of making a Type I error when the null hypothesis is true as an
equality is called the - ✔✔level of significance.
✔✔Which of the following null hypotheses cannot be correct? - ✔✔H0: u not=10.
✔✔It has been stated that at least 75 out of every 100 people who go to the movies on
Saturday night buy popcorn. Identify the null and alternative hypotheses. - ✔✔H0:
p>.75, Ha: p<.75.
✔✔A fast food restaurant has automatic drink dispensers to help fill orders more
quickly. When the 12 ounce button is pressed, they would like for exactly 12 ounces of
beverage to be dispensed. There is, however, undoubtedly some variation in this
amount. The company does not want the machine to systematically over fill or under fill
the cups. Which of the following gives the correct set of hypotheses? - ✔✔H0: u=12,
Ha: u not=12
✔✔Which of the following describes a Type II Error? - ✔✔Accept H0 when H0 is false.
, ✔✔Which of the following does not need to be known in order to compute the p-value? -
✔✔The level of significance.
✔✔What is the probability of making a Type I error? - ✔✔𝛼 alpha.
✔✔The p-value - ✔✔must be a number between 0 and 1.
✔✔The normal probability distribution can be used to approximate the sampling
distribution of as long as - ✔✔np>5 and n(1-p)>5.
✔✔For the case where σ is unknown, which statistic is used to estimate σ? - ✔✔S
✔✔For the case where σ is unknown, the test statistic has a t distribution. How many
degrees of freedom does it have? n-1Which of the following describes a Type I Error? -
✔✔Reject H0 when H0 is true.
✔✔The matched sample design often leads to a smaller sampling error than the
independent sample design. The primary reason is that in a matched sample design -
✔✔variation between subjects is eliminated because the same subjects are used for
both treatments.
✔✔Suppose we are constructing an interval estimate for the difference between the
means of two populations when the standard deviations of the two populations are
unknown. Suppose it can be assumed that the two populations have equal variances. If
n1 is the size of sample 1 and n2 is the size of sample 2, we must use a t distribution
with - ✔✔degrees of freedom.
✔✔A researcher recruits 25 people to participate in a study on alcohol consumption and
its interactions with Tylenol. The 25 participants had to come to a check-in center every
day at 7:00 a.m. for one week. They were given various amounts of alcohol. Each day,
each participant would flip a coin to determine if they also took Tylenol with their
alcohol. They found that their BAC was 25% higher on days when they were given
Tylenol with their alcohol than when they drank alcohol alone. This is an example of
a(n) - ✔✔matched sample design.
✔✔The standard error of is given by - ✔✔The one that has a root square covering the
entire thing
✔✔Which of the following scenarios follows a matched sample design? - ✔✔A teacher
uses a pretest and then a post test with her students to see how much they have
improved.
✔✔A company wants to identify which of the two production methods has the smaller
completion time. One sample of workers is selected and each worker first uses one
QUESTIONS AND ANSWERS SURE A+
✔✔The probability of making a Type I error when the null hypothesis is true as an
equality is called the - ✔✔level of significance.
✔✔Which of the following null hypotheses cannot be correct? - ✔✔H0: u not=10.
✔✔It has been stated that at least 75 out of every 100 people who go to the movies on
Saturday night buy popcorn. Identify the null and alternative hypotheses. - ✔✔H0:
p>.75, Ha: p<.75.
✔✔A fast food restaurant has automatic drink dispensers to help fill orders more
quickly. When the 12 ounce button is pressed, they would like for exactly 12 ounces of
beverage to be dispensed. There is, however, undoubtedly some variation in this
amount. The company does not want the machine to systematically over fill or under fill
the cups. Which of the following gives the correct set of hypotheses? - ✔✔H0: u=12,
Ha: u not=12
✔✔Which of the following describes a Type II Error? - ✔✔Accept H0 when H0 is false.
, ✔✔Which of the following does not need to be known in order to compute the p-value? -
✔✔The level of significance.
✔✔What is the probability of making a Type I error? - ✔✔𝛼 alpha.
✔✔The p-value - ✔✔must be a number between 0 and 1.
✔✔The normal probability distribution can be used to approximate the sampling
distribution of as long as - ✔✔np>5 and n(1-p)>5.
✔✔For the case where σ is unknown, which statistic is used to estimate σ? - ✔✔S
✔✔For the case where σ is unknown, the test statistic has a t distribution. How many
degrees of freedom does it have? n-1Which of the following describes a Type I Error? -
✔✔Reject H0 when H0 is true.
✔✔The matched sample design often leads to a smaller sampling error than the
independent sample design. The primary reason is that in a matched sample design -
✔✔variation between subjects is eliminated because the same subjects are used for
both treatments.
✔✔Suppose we are constructing an interval estimate for the difference between the
means of two populations when the standard deviations of the two populations are
unknown. Suppose it can be assumed that the two populations have equal variances. If
n1 is the size of sample 1 and n2 is the size of sample 2, we must use a t distribution
with - ✔✔degrees of freedom.
✔✔A researcher recruits 25 people to participate in a study on alcohol consumption and
its interactions with Tylenol. The 25 participants had to come to a check-in center every
day at 7:00 a.m. for one week. They were given various amounts of alcohol. Each day,
each participant would flip a coin to determine if they also took Tylenol with their
alcohol. They found that their BAC was 25% higher on days when they were given
Tylenol with their alcohol than when they drank alcohol alone. This is an example of
a(n) - ✔✔matched sample design.
✔✔The standard error of is given by - ✔✔The one that has a root square covering the
entire thing
✔✔Which of the following scenarios follows a matched sample design? - ✔✔A teacher
uses a pretest and then a post test with her students to see how much they have
improved.
✔✔A company wants to identify which of the two production methods has the smaller
completion time. One sample of workers is selected and each worker first uses one
