Question 1

A parametric test is NOT based on assumptions about the population.

Accepted Answer

A) True 
 B)False  False

Question 2

The distribution of means has the same mean as the distribution of scores for the population, and the spread is:

Accepted Answer

A)  Tests 
B)  Nonparameters 
C)  Parameters 
D)  Assumptions 
A)  Tests 
B)  Nonparameters 
C)  Parameters 
D)  Assumptions D

Question 3

If 28 percent of scores fall between a negative z score and the mean, then 32 percent of scores fall below that z score.

Accepted Answer

A) True 
 B)False  False

Question 4

Mehl (2007) published a study in the journal Science reporting the results of an extensive study of 396 men and women comparing the number of words uttered per day by each sex.If Mehl was testing the idea that women talk more than men, what type of hypothesis test would he conduct?

Accepted Answer

A)  one-tailed test 
B)  two-tailed test 
C)  nonparametric test 
D)  z test 
A)  one-tailed test 
B)  two-tailed test 
C)  nonparametric test 
D)  z test

Question 5

Stephanie wonders whether college textbooks change in price as students advance in their academic work.She finds some national data on college textbooks that indicates the average price of a text is $96 with a standard deviation of $31.She decides to collect the prices of 30 textbooks that are required for senior-level courses at her university.She finds the average cost to be $89.What is the percentile rank of Stephanie's collection of books? (Round z score to two decimal places.)

Accepted Answer

A)  8.71 
B)  10.75 
C)  39.25 
D)  41.29 
A)  8.71 
B)  10.75 
C)  39.25 
D)  41.29

Question 6

When hypothesis testing, a more common approach is to use a _____ rather than a _____.

Accepted Answer

A)  two-tailed test; one-tailed test 
B)  one-tailed test; two-tailed test 
C)  null hypothesis; research hypothesis 
D)  research hypothesis; null hypothesis 
A)  two-tailed test; one-tailed test 
B)  one-tailed test; two-tailed test 
C)  null hypothesis; research hypothesis 
D)  research hypothesis; null hypothesis

Question 7

The average do-it-yourself bedroom makeover costs $475 with a standard deviation of $86 (fictional data).Tanya redoes her daughter's room for $654.What percent of bedroom makeovers cost less than Tanya spent? (Round z score to two decimal places.)

Accepted Answer

A)  1.88% 
B)  38.49% 
C)  48.12% 
D)  98.12% 
A)  1.88% 
B)  38.49% 
C)  48.12% 
D)  98.12%

Question 8

As long as the sample size is greater than 30, one can assume that the underlying population has an approximately normal distribution.

Accepted Answer

A) True 
 B)False

Question 9

As long as the sample size is greater than 30, the results of a study can be generalized to most populations.

Accepted Answer

A) True 
 B)False

Question 10

The _____ hypothesis is usually the "boring" one.

Accepted Answer

A)  null 
B)  research 
C)  normalized 
D)  standard 
A)  null 
B)  research 
C)  normalized 
D)  standard

Question 11

In one statistics course, students reported studying an average of 9.92 hours a week, with a standard deviation of 4.54.Treating the class as the population, what is the percentile for a student in the class who studies 11 hours a week? (Round z score to two decimal places.)

Accepted Answer

A)  9.48 
B)  40.52 
C)  50.00 
D)  59.48 
A)  9.48 
B)  40.52 
C)  50.00 
D)  59.48

Question 12

A nondirectional test looks in both tails of the distribution.

Accepted Answer

A) True 
 B)False

Question 13

When determining the z value for a mean rather than a score, the value is called a z statistic.

Accepted Answer

A) True 
 B)False

Question 14

The second step in hypothesis testing is:

Accepted Answer

A)  stating the null and research hypotheses. 
B)  determining the characteristics of the comparison distribution. 
C)  selecting the appropriate test based on the population, comparison distribution, and underlying assumptions. 
D)  determining the critical values for a test. 
A)  stating the null and research hypotheses. 
B)  determining the characteristics of the comparison distribution. 
C)  selecting the appropriate test based on the population, comparison distribution, and underlying assumptions. 
D)  determining the critical values for a test.

Question 15

The same logic used to find an individual's percentile rank can be applied to a mean to determine the relative standing of the mean in a distribution of means.

Accepted Answer

A) True 
 B)False

Question 16

If one fails to reject the null hypothesis, the result is said to be:

Accepted Answer

A)  unacceptable. 
B)  unimportant. 
C)  not statistically significant. 
D)  valid. 
A)  unacceptable. 
B)  unimportant. 
C)  not statistically significant. 
D)  valid.

Question 17

Under what conditions is it permissible to proceed with a hypothesis test even though the assumption that the population distribution is approximately normal is violated?

Accepted Answer

A)  We are cautious about generalizing the results. 
B)  The sample size is greater than 30. 
C)  The data are not clearly ratio. 
D)  The data are not clearly nominal or ordinal. 
A)  We are cautious about generalizing the results. 
B)  The sample size is greater than 30. 
C)  The data are not clearly ratio. 
D)  The data are not clearly nominal or ordinal.

Question 18

What is the percentage of observations that fall between z scores of -1.02 and 0.61?

Accepted Answer

A)  22.91 
B)  34.61 
C)  42.48 
D)  57.52 
A)  22.91 
B)  34.61 
C)  42.48 
D)  57.52

Question 19

Replication can help determine the circumstances in which a finding holds true or not.

Accepted Answer

A) True 
 B)False

Question 20

A nonparametric test is NOT based on assumptions about the population.

Accepted Answer

A) True 
 B)False

A parametric test is NOT based on assumptions about the population.

The distribution of means has the same mean as the distribution of scores for the population, and the spread is:

If 28 percent of scores fall between a negative z score and the mean, then 32 percent of scores fall below that z score.

Mehl (2007) published a study in the journal Science reporting the results of an extensive study of 396 men and women comparing the number of words uttered per day by each sex.If Mehl was testing the idea that women talk more than men, what type of hypothesis test would he conduct?

When hypothesis testing, a more common approach is to use a _ rather than a _.

The average do-it-yourself bedroom makeover costs $475 with a standard deviation of $86 (fictional data).Tanya redoes her daughter's room for $654.What percent of bedroom makeovers cost less than Tanya spent? (Round z score to two decimal places.)

As long as the sample size is greater than 30, one can assume that the underlying population has an approximately normal distribution.

As long as the sample size is greater than 30, the results of a study can be generalized to most populations.

The _____ hypothesis is usually the "boring" one.

In one statistics course, students reported studying an average of 9.92 hours a week, with a standard deviation of 4.54.Treating the class as the population, what is the percentile for a student in the class who studies 11 hours a week? (Round z score to two decimal places.)

A nondirectional test looks in both tails of the distribution.

When determining the z value for a mean rather than a score, the value is called a z statistic.

The second step in hypothesis testing is:

The same logic used to find an individual's percentile rank can be applied to a mean to determine the relative standing of the mean in a distribution of means.

If one fails to reject the null hypothesis, the result is said to be:

Under what conditions is it permissible to proceed with a hypothesis test even though the assumption that the population distribution is approximately normal is violated?

What is the percentage of observations that fall between z scores of -1.02 and 0.61?

Replication can help determine the circumstances in which a finding holds true or not.

A nonparametric test is NOT based on assumptions about the population.

An Introduction to Statistics and Research Design

Frequency Distributions

Visual Displays of Data

Central Tendency and Variability

Sampling and Probability

The Normal Curve, Standardization and Z Scores

Confidence Intervals, Effect Size, and Statistical Power

The Single-Sample T Test

The Paired-Samples T Test

The Independent-Samples T Test

One-Way Between-Groups Anova

One-Way Within-Groups Anova

Two-Way Between-Groups Anova

Correlation

Regression

Chi-Square Tess

Choosing and Reporting Statistics

Filters

Exam 7: Hypothesis Testing With Z Tests

A parametric test is NOT based on assumptions about the population.

The distribution of means has the same mean as the distribution of scores for the population, and the spread is:

If 28 percent of scores fall between a negative z score and the mean, then 32 percent of scores fall below that z score.

Mehl (2007) published a study in the journal Science reporting the results of an extensive study of 396 men and women comparing the number of words uttered per day by each sex.If Mehl was testing the idea that women talk more than men, what type of hypothesis test would he conduct?

When hypothesis testing, a more common approach is to use a _____ rather than a _____.

The average do-it-yourself bedroom makeover costs $475 with a standard deviation of $86 (fictional data).Tanya redoes her daughter's room for $654.What percent of bedroom makeovers cost less than Tanya spent? (Round z score to two decimal places.)

As long as the sample size is greater than 30, one can assume that the underlying population has an approximately normal distribution.

As long as the sample size is greater than 30, the results of a study can be generalized to most populations.

The _____ hypothesis is usually the "boring" one.

In one statistics course, students reported studying an average of 9.92 hours a week, with a standard deviation of 4.54.Treating the class as the population, what is the percentile for a student in the class who studies 11 hours a week? (Round z score to two decimal places.)

A nondirectional test looks in both tails of the distribution.

When determining the z value for a mean rather than a score, the value is called a z statistic.

The second step in hypothesis testing is:

The same logic used to find an individual's percentile rank can be applied to a mean to determine the relative standing of the mean in a distribution of means.

If one fails to reject the null hypothesis, the result is said to be:

Under what conditions is it permissible to proceed with a hypothesis test even though the assumption that the population distribution is approximately normal is violated?

What is the percentage of observations that fall between z scores of -1.02 and 0.61?

Replication can help determine the circumstances in which a finding holds true or not.

A nonparametric test is NOT based on assumptions about the population.

An Introduction to Statistics and Research Design

Frequency Distributions

Visual Displays of Data

Central Tendency and Variability

Sampling and Probability

The Normal Curve, Standardization and Z Scores

Confidence Intervals, Effect Size, and Statistical Power

The Single-Sample T Test

The Paired-Samples T Test

The Independent-Samples T Test

One-Way Between-Groups Anova

One-Way Within-Groups Anova

Two-Way Between-Groups Anova

Correlation

Regression

Chi-Square Tess

Choosing and Reporting Statistics

Filters

When hypothesis testing, a more common approach is to use a _ rather than a _.