Question 1

Statisticians recommend that the power of a test equal _____,that is,the probability that one will correctly reject a false null hypothesis.

Accepted Answer

A)  5% 
B)  10% 
C)  50% 
D)  80% 
E)  95% 
A)  5% 
B)  10% 
C)  50% 
D)  80% 
E)  95% D

Question 2

List the six-stage sequence for testing statistical significance.

Accepted Answer

The six stages in hypothesis testing are 1)state the null hypothesis,2)choose the statistical test,3)select the desired level of significance,4)compute the calculated difference value,5)obtain the critical value,and 6)interpret the test.

Question 3

How can a researcher determine whether data meet the assumption of normality necessary for using parametric tests?

Accepted Answer

A)  Assess the level of significance 
B)  Determine the probability of making a type II error 
C)  Determine the probability of making a type I error 
D)  Examine a normal probability plot 
E)  Examine whether the distribution is bimodal or multimodal 
A)  Assess the level of significance 
B)  Determine the probability of making a type II error 
C)  Determine the probability of making a type I error 
D)  Examine a normal probability plot 
E)  Examine whether the distribution is bimodal or multimodal D

Question 4

When sample sizes exceed _____,the t and Z distributions are virtually identical.

Accepted Answer

A)  120 
B)  300 
C)  500 
D)  1000 
E)  the t and Z distributions will never be identical 
A)  120 
B)  300 
C)  500 
D)  1000 
E)  the t and Z distributions will never be identical

Question 5

A researcher should consider answers to all of the following questions except _____ when selecting a particular test of significance.

Accepted Answer

A)  how many samples are involved in the test? 
B)  are the samples related? 
C)  what type of data is involved? 
D)  what is the level of significance? 
E)  all of the above should be addressed 
A)  how many samples are involved in the test? 
B)  are the samples related? 
C)  what type of data is involved? 
D)  what is the level of significance? 
E)  all of the above should be addressed

Question 6

Which of the following involves a test of two-related samples?

Accepted Answer

A)  test of differences in the percent of men and women who are or are not members of Greek organizations on campus 
B)  Test of the average incomes of subscribers of Southern Living and Better Homes and Gardens 
C)  Test of whether the mean salary of professors at Metro University is higher than the national average for university professors 
D)  Test of whether a change occurred in the proneness for heart disease among people who switched to a diet high in fish 
E)  Test of differences in ad recall among three experimental groups (each of which saw a different advertisement) and a control group 
A)  test of differences in the percent of men and women who are or are not members of Greek organizations on campus 
B)  Test of the average incomes of subscribers of Southern Living and Better Homes and Gardens 
C)  Test of whether the mean salary of professors at Metro University is higher than the national average for university professors 
D)  Test of whether a change occurred in the proneness for heart disease among people who switched to a diet high in fish 
E)  Test of differences in ad recall among three experimental groups (each of which saw a different advertisement) and a control group

Question 7

_____ tests are hypothesis testing procedures that assume that the variables of interest are measured on at least an interval scale.

Accepted Answer

A)  Parameter 
B)  Parametric 
C)  Nonparametric 
D)  Significance 
E)  Metric 
A)  Parameter 
B)  Parametric 
C)  Nonparametric 
D)  Significance 
E)  Metric

Question 8

If the hypothesis presented is tested with a .05 level of significance and the resulting p value is .01,which of the following is the correct decision regarding the null hypothesis?

Accepted Answer

A)  Reject the null 
B)  Cannot reject the null 
C)  The decision cannot be determined with the information provided 
D)  Reject the alternate 
E)  None of the above 
A)  Reject the null 
B)  Cannot reject the null 
C)  The decision cannot be determined with the information provided 
D)  Reject the alternate 
E)  None of the above

Question 9

When conducting an ANOVA,if the F ratio is close to 1,which of the following interpretations is true?

Accepted Answer

A)  The null hypothesis is rejected 
B)  There is no difference between the means of the groups examined 
C)  The population means are unequal 
D)  The between-groups variance is twice the within-groups variance 
E)  All of the above are true 
A)  The null hypothesis is rejected 
B)  There is no difference between the means of the groups examined 
C)  The population means are unequal 
D)  The between-groups variance is twice the within-groups variance 
E)  All of the above are true

Question 10

If a difference is not caused only by random sampling fluctuations,it is said to have _____.

Accepted Answer

A)  resistance 
B)  statistical significance 
C)  substantive significance 
D)  reasonable doubt 
E)  practical significance 
A)  resistance 
B)  statistical significance 
C)  substantive significance 
D)  reasonable doubt 
E)  practical significance

Question 11

What is the difference between a Type I error and a Type II error? How are the two errors related?

Accepted Answer

A Type I erroroccurs when the sample res

Question 12

Which of the following tests is most appropriate for examining differences in the average number of hours spent viewing television among four different age groups?

Accepted Answer

A)  Z test 
B)  t-test 
C)  ANOVA 
D)  X2 
E)  McNemar test 
A)  Z test 
B)  t-test 
C)  ANOVA 
D)  X2 
E)  McNemar test

Question 13

The level of significance chosen for hypothesis testing is based on _____.

Accepted Answer

A)  the desired level of confidence one wishes to have in the results 
B)  the desired degree of precision 
C)  how much risk of a type I error one is willing to accept 
D)  the statistical test used 
E)  whether the sample is a probability sample 
A)  the desired level of confidence one wishes to have in the results 
B)  the desired degree of precision 
C)  how much risk of a type I error one is willing to accept 
D)  the statistical test used 
E)  whether the sample is a probability sample

Question 14

Which of the following hypotheses is a null hypothesis?

Accepted Answer

A)  There is no difference in the monthly grocery bills of families with one child and families with two children 
B)  Grocery bills vary according to the number of meals eaten outside the home 
C)  Families with two children have significantly higher grocery bills than families with just one child 
D)  There is a relationship between grocery bills and the number of people in a household 
E)  The mean age in a household is predictive of the amount of money sent on food each month 
A)  There is no difference in the monthly grocery bills of families with one child and families with two children 
B)  Grocery bills vary according to the number of meals eaten outside the home 
C)  Families with two children have significantly higher grocery bills than families with just one child 
D)  There is a relationship between grocery bills and the number of people in a household 
E)  The mean age in a household is predictive of the amount of money sent on food each month

Question 15

Which of the following is not true of the Kruskal-Wallis test?

Accepted Answer

A)  It is a one-way analysis of variance by ranks 
B)  It assumes random selection 
C)  It assumes a continuous distribution 
D)  It is used with two-related samples 
E)  All of the above are true 
A)  It is a one-way analysis of variance by ranks 
B)  It assumes random selection 
C)  It assumes a continuous distribution 
D)  It is used with two-related samples 
E)  All of the above are true

Question 16

Which test is an extension of the McNemar test useful for tests involving more than two samples?

Accepted Answer

A)  Cochran Q 
B)  ANOVA 
C)  n-way ANOVA 
D)  Kruskal-Wallis 
E)  Mann-Whitney U 
A)  Cochran Q 
B)  ANOVA 
C)  n-way ANOVA 
D)  Kruskal-Wallis 
E)  Mann-Whitney U

Question 17

Which of the following illustrates the correct expression of the null hypothesis for the alternate hypothesis that more than 40% of Internet users shop online?

Accepted Answer

A)  H0: π≤ .40 
B)  HA: π> .40 
C)  H0: π = .40 
D)  HA: π≠ .40 
E)  H0: µ = .40 
A)  H0: π≤ .40 
B)  HA: π> .40 
C)  H0: π = .40 
D)  HA: π≠ .40 
E)  H0: µ = .40

Question 18

Which of the following statements is not correct about the alternative hypothesis?

Accepted Answer

A)  It may be directional or nondirectional 
B)  The alternative hypothesis represents the conclusion for which evidence is sought 
C)  The alternative hypothesis is the opposite of the null hypothesis 
D)  It is always the hypothesis tested 
E)  None of the statements are correct 
A)  It may be directional or nondirectional 
B)  The alternative hypothesis represents the conclusion for which evidence is sought 
C)  The alternative hypothesis is the opposite of the null hypothesis 
D)  It is always the hypothesis tested 
E)  None of the statements are correct

Question 19

_____ tests are hypothesis testing procedures that assume that the variables are measured on a nominal or ordinal scale.

Accepted Answer

A)  Parameter 
B)  Parametric 
C)  Nonparametric 
D)  Resistant 
E)  Type I 
A)  Parameter 
B)  Parametric 
C)  Nonparametric 
D)  Resistant 
E)  Type I

Question 20

What type of hypothesis states that a sample statistic is either greater than or less than the population parameter?

Accepted Answer

A)  Null 
B)  One-tailed 
C)  Two-tailed 
D)  Three-tailed 
E)  None of the above 
A)  Null 
B)  One-tailed 
C)  Two-tailed 
D)  Three-tailed 
E)  None of the above

Exam 17: Hypothesis Testing

Statisticians recommend that the power of a test equal _____,that is,the probability that one will correctly reject a false null hypothesis.

List the six-stage sequence for testing statistical significance.

How can a researcher determine whether data meet the assumption of normality necessary for using parametric tests?

When sample sizes exceed _____,the t and Z distributions are virtually identical.

A researcher should consider answers to all of the following questions except _____ when selecting a particular test of significance.

Which of the following involves a test of two-related samples?

_____ tests are hypothesis testing procedures that assume that the variables of interest are measured on at least an interval scale.

If the hypothesis presented is tested with a .05 level of significance and the resulting p value is .01,which of the following is the correct decision regarding the null hypothesis?

When conducting an ANOVA,if the F ratio is close to 1,which of the following interpretations is true?

If a difference is not caused only by random sampling fluctuations,it is said to have _____.

What is the difference between a Type I error and a Type II error? How are the two errors related?

Which of the following tests is most appropriate for examining differences in the average number of hours spent viewing television among four different age groups?

The level of significance chosen for hypothesis testing is based on _____.

Which of the following hypotheses is a null hypothesis?

Which of the following is not true of the Kruskal-Wallis test?

Which test is an extension of the McNemar test useful for tests involving more than two samples?

Which of the following illustrates the correct expression of the null hypothesis for the alternate hypothesis that more than 40% of Internet users shop online?

Which of the following statements is not correct about the alternative hypothesis?

_____ tests are hypothesis testing procedures that assume that the variables are measured on a nominal or ordinal scale.

What type of hypothesis states that a sample statistic is either greater than or less than the population parameter?

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