Question 1

The two-tailed p value that a statistical program produces refers to

Accepted Answer

A)   the value of t .
B)   the probability of getting at least that large a value of t if the null hypothesis is false.
C)   the probability of getting at least that large an absolute value of t if the null hypothesis is true.
D)   the probability that the null hypothesis is true.E) C) and D)
F) None of the above

Question 2

Which of the following statements is true?

Accepted Answer

A)   Confidence intervals are the boundaries of confidence limits.
B)   Confidence intervals always enclose the population mean.
C)   Sample size does not affect the calculation of t .
D)   Confidence limits are the boundaries of confidence intervals.E) None of the above
F) B) and C)

Question 3

If the standard deviation of the population is 15 and we repeatedly draw samples of 25 observations each, the resulting sample means will have a standard error of

Accepted Answer

A)   2
B)   3
C)   15
D)   0.60E) A) and B)
F) C) and D)

Question 4

All of the following increase the magnitude of the t statistic and/or the likelihood of rejecting H0 EXCEPT

Accepted Answer

A)   a greater difference between the sample mean and the population mean.
B)   an increase in sample size.
C)   a decrease in sample variance.
D)   a smaller significance level ( a ) .E) All of the above
F) B) and C)

Question 5

The importance of the underlying assumption of normality behind a one-sample means test

Accepted Answer

A)   depends on how fussy you are.
B)   depends on the sample size.
C)   depends on whether you are solving for t or z .
D)   doesn't depend on anything.E) C) and D)
F) B) and C)

Question 6

When would you NOT use a standardized measure of effect size?

Accepted Answer

A)   when the difference in means is itself meaningful
B)   when it is clearer to the reader to talk about a percentage
C)   when some other measure conveys more useful information
D)   all of the aboveE) B) and C)
F) None of the above

Question 7

A sampling distribution of the mean is typically the mean of one sample.

Accepted Answer

A) True 
 B)False

Question 8

Calculate the 95% confidence interval for μ given 
  s = 25, and N = 101.

Accepted Answer

p (95.4 ≤ ...

Question 9

A normal distribution is one in which all outcomes are equally likely.

Accepted Answer

A) True 
 B)False

Question 10

With a one-sample t test, the value of t is

Accepted Answer

A)   always positive.
B)   positive if the sample mean is too small.
C)   negative whenever the sample standard deviation is negative.
D)   positive if the sample mean is larger than the hypothesized population mean.E) B) and C)
F) A) and B)

Question 11

If we have calculated a confidence interval and we find that it does NOT include the population mean,

Accepted Answer

A)   we must have done something wrong in collecting data.
B)   our interval was too wide.
C)   we made a mistake in calculation.
D)   this will happen a fixed percentage of the time.E) A) and B)
F) All of the above

Question 12

Given  m = 100, 
  s = 27, and N = 30: 
a. Calculate t. 
b. Write a sentence interpreting the value of t as a two-tailed test. 
c. Write a sentence interpreting the value of t as a one-tailed test.

Accepted Answer

a. t = -1.25
b. The sample me...

Question 13

When comparing the mean of a sample of 30 people to the population mean, the degrees of freedom are 31.

Accepted Answer

A) True 
 B)False

Question 14

With large samples and a small population variance, the sample means usually

Accepted Answer

A)   will be close to the population mean.
B)   will slightly underestimate the population mean.
C)   will slightly overestimate the population mean.
D)   will equal the population mean.E) C) and D)
F) All of the above

Question 15

If we compute 95% confidence limits on the mean as 112.5 - 118.4, we can conclude that

Accepted Answer

A)   the probability is .95 that the sample mean lies between 112.5 and 118.4.
B)   the probability is .05 that the population mean lies between 112.5 and 118.4.
C)   an interval computed in this way has a probability of .95 of bracketing the population mean.
D)   the population mean is not less than 112.5.E) A) and B)
F) A) and C)

Question 16

The mean anxiety score in elementary school children is 14.55. A researcher wants to know if children of anxious parents are more anxious than the average child. Below are the anxiety scores from 10 children of anxious parents. 
13         14         14         15         15         15         16         17         17         18 
  
a. Calculate the t value. 
b. Write a sentence to answer the researcher's question.

Accepted Answer

a. t = 1.18
b. Based on this ...

Question 17

A one-sample t test was used to see if a college ski team skied faster than the population of skiers at a popular ski resort. The resulting statistic was t .05(23)  = -7.13, p

Accepted Answer

A)   The sample mean of the college skiers was significantly different from the population mean.
B)   The sample mean of the college skiers was not significantly different from the population mean.
C)   The null hypothesis was true.
D)   The sample mean was greater than the population mean.E) All of the above
F) C) and D)

Question 18

When we take a single sample mean as an estimate of the value of a population mean, we have

Accepted Answer

A)   a point estimate.
B)   an interval estimate.
C)   a population estimate.
D)   a parameter.E) A) and B)
F) A) and C)

Question 19

The sampling distribution of the mean is

Accepted Answer

A)   the population mean.
B)   the distribution of the population mean over many populations.
C)   the distribution of sample means over repeated samples.
D)   the mean of the distribution of the sample.E) All of the above
F) None of the above

Question 20

Assuming a two-tailed one sample test is being used, what are the critical values for t given the following sample sizes: 
a. N = 10 
b. N = 15 
c. N = 30

Accepted Answer

a. 2.262
...

Exam 12: Hypothesis Tests Applied to Means: One Sample

Correct Answer
verified
a. t = 1.18
b. Based on this ...
View Answer

If we have calculated a confidence interval and we find that it does NOT include the population mean,

Correct Answer
verified

With a one-sample t test, the value of t is

Correct Answer
verified

When we take a single sample mean as an estimate of the value of a population mean, we have

Correct Answer
verified

Which of the following statements is true?

Correct Answer
verified

Given m = 100, s = 27, and N = 30: a. Calculate t. b. Write a sentence interpreting the value of t as a two-tailed test. c. Write a sentence interpreting the value of t as a one-tailed test.

Correct Answer
verified
a. t = -1.25
b. The sample me...
View Answer

When comparing the mean of a sample of 30 people to the population mean, the degrees of freedom are 31.

Correct Answer
verified

A normal distribution is one in which all outcomes are equally likely.

Correct Answer
verified

The two-tailed p value that a statistical program produces refers to

Correct Answer
verified

All of the following increase the magnitude of the t statistic and/or the likelihood of rejecting H₀ EXCEPT

Correct Answer
verified

With large samples and a small population variance, the sample means usually

Correct Answer
verified

A one-sample t test was used to see if a college ski team skied faster than the population of skiers at a popular ski resort. The resulting statistic was t _.05(23) = -7.13, p

Correct Answer
verified

A sampling distribution of the mean is typically the mean of one sample.

Correct Answer
verified

The importance of the underlying assumption of normality behind a one-sample means test

Correct Answer
verified

Calculate the 95% confidence interval for μ given s = 25, and N = 101.

Correct Answer
verified
p (95.4 ≤ ...
View Answer

If the standard deviation of the population is 15 and we repeatedly draw samples of 25 observations each, the resulting sample means will have a standard error of

Correct Answer
verified

Assuming a two-tailed one sample test is being used, what are the critical values for t given the following sample sizes: a. N = 10 b. N = 15 c. N = 30

Correct Answer
verified
a. 2.262
...
View Answer

The sampling distribution of the mean is

Correct Answer
verified

If we compute 95% confidence limits on the mean as 112.5 - 118.4, we can conclude that

Correct Answer
verified

When would you NOT use a standardized measure of effect size?

Correct Answer
verified

Exam 12: Hypothesis Tests Applied to Means: One Sample

Correct Answerverifieda. t = 1.18 b. Based on this ...View AnswerShow Answer

If we have calculated a confidence interval and we find that it does NOT include the population mean,

Correct AnswerverifiedShow Answer

With a one-sample t test, the value of t is

Correct AnswerverifiedShow Answer

When we take a single sample mean as an estimate of the value of a population mean, we have

Correct AnswerverifiedShow Answer

Which of the following statements is true?

Correct AnswerverifiedShow Answer

Given m = 100, s = 27, and N = 30: a. Calculate t. b. Write a sentence interpreting the value of t as a two-tailed test. c. Write a sentence interpreting the value of t as a one-tailed test.

Correct Answerverifieda. t = -1.25 b. The sample me...View AnswerShow Answer

When comparing the mean of a sample of 30 people to the population mean, the degrees of freedom are 31.

Correct AnswerverifiedShow Answer

A normal distribution is one in which all outcomes are equally likely.

Correct AnswerverifiedShow Answer

The two-tailed p value that a statistical program produces refers to

Correct AnswerverifiedShow Answer

All of the following increase the magnitude of the t statistic and/or the likelihood of rejecting H0 EXCEPT

Correct AnswerverifiedShow Answer

With large samples and a small population variance, the sample means usually

Correct AnswerverifiedShow Answer

A one-sample t test was used to see if a college ski team skied faster than the population of skiers at a popular ski resort. The resulting statistic was t .05(23) = -7.13, p

Correct AnswerverifiedShow Answer

A sampling distribution of the mean is typically the mean of one sample.

Correct AnswerverifiedShow Answer

The importance of the underlying assumption of normality behind a one-sample means test

Correct AnswerverifiedShow Answer

Calculate the 95% confidence interval for μ given s = 25, and N = 101.

Correct Answerverifiedp (95.4 ≤ ...View AnswerShow Answer

If the standard deviation of the population is 15 and we repeatedly draw samples of 25 observations each, the resulting sample means will have a standard error of

Correct AnswerverifiedShow Answer

Assuming a two-tailed one sample test is being used, what are the critical values for t given the following sample sizes: a. N = 10 b. N = 15 c. N = 30

Correct Answerverifieda. 2.262 ...View AnswerShow Answer

The sampling distribution of the mean is

Correct AnswerverifiedShow Answer

If we compute 95% confidence limits on the mean as 112.5 - 118.4, we can conclude that

Correct AnswerverifiedShow Answer

When would you NOT use a standardized measure of effect size?

Correct AnswerverifiedShow Answer

Correct Answer
verified
a. t = 1.18
b. Based on this ...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
a. t = -1.25
b. The sample me...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

All of the following increase the magnitude of the t statistic and/or the likelihood of rejecting H₀ EXCEPT

Correct Answer
verified

Correct Answer
verified

A one-sample t test was used to see if a college ski team skied faster than the population of skiers at a popular ski resort. The resulting statistic was t _.05(23) = -7.13, p

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
p (95.4 ≤ ...
View Answer

Correct Answer
verified

Correct Answer
verified
a. 2.262
...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified