When conducting hypothesis tests for two sample means,the term m1 - m2 in the numerator of the formula reduces to zero because

A) the standard deviations are calculated first. B) the tests are conducted at very low alpha levels. C) the samples are independent as well as random. D) the null hypothesis is assumed to be true. A) the standard deviations are calculated first. B) the tests are conducted at very low alpha levels. C) the samples are independent as well as random. D) the null hypothesis is assumed to be true.

Exam 9: Hypothesis Testing II: the Two-Sample Case

Samples of Republicans and Democrats have been tested for their level of support for welfare reform and the null hypothesis has been rejected.What may we conclude?

(Multiple Choice)

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Question 21

Random samples of 1546 men and 1678 women have been given a scale that measures support of legal abortion.Men average 12.45 and women average 12.46 and the difference is significant at the 0.05 level.What can we conclude?

(Multiple Choice)

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Question 22

When is the t distribution used instead of the Z distribution to test the significance of the difference between two sample means?

(Multiple Choice)

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Question 23

Very large random samples of Catholics and Protestants have been questioned about their opinions on cohabitation.Forty-six percent of the Protestant and 47% of the Catholics approve of males and females living together without being married.The difference has been tested and found to be statistically significant.What is the most reasonable conclusion?

(Multiple Choice)

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Question 24

When testing for the significance of the difference between two sample means,which parameters must be estimated with sample values?

(Multiple Choice)

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Question 25

From a university population,random samples of 145 men and 237 women have been asked if they have ever cheated in a college class.8% of the men and 6% of the women said that they have.What is the appropriate test to assess the significance of this difference?

(Multiple Choice)

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Question 26

In the two sample case,the null hypothesis is always about the difference in the

(Multiple Choice)

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Question 27

When conducting hypothesis tests for two sample means,the test statistic is

(Multiple Choice)

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Question 28

When testing for the significance of the difference between two sample means,we must first estimate ____ before we can compute the test statistic.

(Multiple Choice)

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Question 29

Samples of Republicans and Democrats have been tested for their level of support for a new immigration policy.The test statistic is 0.54 and the critical region begins at $\pm$ 1.96.What may we conclude?

(Multiple Choice)

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Question 30

When testing for the significance of the difference between two sample means,which of the following is almost always unknown?

(Multiple Choice)

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Question 31

Random samples of men and women have been given a scale that measures their support for gun control.Men average 10.2 with standard deviation of 5.3.Women also average 10.2 but their standard deviation is 1.8.How could these results be dealt with appropriately?

(Multiple Choice)

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Question 32

A sample of students attending a large university has been selected.Is there a statistically significant difference between Liberal Arts majors and other students on average number of books (other than those required by course work)read per year? Use the five step model and write a sentence or two interpreting your results. Liberal Ants Other =16.2 =13.7 =2.3 =9.0 =236 =321

(Short Answer)

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Question 33

When testing the significance of the difference between two sample proportions,the null hypothesis is

(Multiple Choice)

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Question 34

When random samples are drawn so that the selection of a case for one sample has no effect on the selection of cases for another sample,the samples are

(Multiple Choice)

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Question 35

Samples from two high schools are being tested for the difference in their average levels of prejudice.One sample contains 39 respondents and the other sample contains 47 respondents.The appropriate sampling distribution is the

(Multiple Choice)

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Question 36

When is the t distribution used instead of the Z distribution to test the significance of the difference between two sample proportions?

(Multiple Choice)

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Question 37

When conducting hypothesis tests for two sample means,the term m₁ - m₂ in the numerator of the formula reduces to zero because

(Multiple Choice)

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Question 38

The larger the sample size,the

(Multiple Choice)

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Question 39

The lower the alpha level,

(Multiple Choice)

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Question 40

Showing 21 - 40 of 47

Samples of Republicans and Democrats have been tested for their level of support for welfare reform and the null hypothesis has been rejected.What may we conclude?

Random samples of 1546 men and 1678 women have been given a scale that measures support of legal abortion.Men average 12.45 and women average 12.46 and the difference is significant at the 0.05 level.What can we conclude?

When is the t distribution used instead of the Z distribution to test the significance of the difference between two sample means?

When testing for the significance of the difference between two sample means,which parameters must be estimated with sample values?

From a university population,random samples of 145 men and 237 women have been asked if they have ever cheated in a college class.8% of the men and 6% of the women said that they have.What is the appropriate test to assess the significance of this difference?

In the two sample case,the null hypothesis is always about the difference in the

When conducting hypothesis tests for two sample means,the test statistic is

When testing for the significance of the difference between two sample means,we must first estimate ____ before we can compute the test statistic.

Samples of Republicans and Democrats have been tested for their level of support for a new immigration policy.The test statistic is 0.54 and the critical region begins at $\pm$ 1.96.What may we conclude?

When testing for the significance of the difference between two sample means,which of the following is almost always unknown?

Random samples of men and women have been given a scale that measures their support for gun control.Men average 10.2 with standard deviation of 5.3.Women also average 10.2 but their standard deviation is 1.8.How could these results be dealt with appropriately?

When testing the significance of the difference between two sample proportions,the null hypothesis is

When random samples are drawn so that the selection of a case for one sample has no effect on the selection of cases for another sample,the samples are

Samples from two high schools are being tested for the difference in their average levels of prejudice.One sample contains 39 respondents and the other sample contains 47 respondents.The appropriate sampling distribution is the

When is the t distribution used instead of the Z distribution to test the significance of the difference between two sample proportions?

When conducting hypothesis tests for two sample means,the term m₁ - m₂ in the numerator of the formula reduces to zero because

The larger the sample size,the

The lower the alpha level,

Introduction

Basic Descriptive Statistics: Percentages Ratios and Rates Frequency Distributions

Charts and Graphs

Measures of Central Tendency

Measures of Dispersion

The Normal Curve

Introduction in Inferential Statistics, the Sampling Distribution, and Estimation

Hypothesis Testing I: the One-Sample Case

Hypothesis Testing III: the Analysis of Variance

Hypothesis Testing Iv: Chi Square

Introduction to Bivariate Association and Measures of Association for Variables Measured at the Nominal Level

Association Between Variables Measured at the Ordinal Level

Association Between Variables Measured at the Interval-Ratio Level

Partial Correlation and Multiple Regression and Correlation

Filters

Exam 9: Hypothesis Testing II: the Two-Sample Case

Samples of Republicans and Democrats have been tested for their level of support for welfare reform and the null hypothesis has been rejected.What may we conclude?

Random samples of 1546 men and 1678 women have been given a scale that measures support of legal abortion.Men average 12.45 and women average 12.46 and the difference is significant at the 0.05 level.What can we conclude?

When is the t distribution used instead of the Z distribution to test the significance of the difference between two sample means?

When testing for the significance of the difference between two sample means,which parameters must be estimated with sample values?

From a university population,random samples of 145 men and 237 women have been asked if they have ever cheated in a college class.8% of the men and 6% of the women said that they have.What is the appropriate test to assess the significance of this difference?

In the two sample case,the null hypothesis is always about the difference in the

When conducting hypothesis tests for two sample means,the test statistic is

When testing for the significance of the difference between two sample means,we must first estimate ____ before we can compute the test statistic.

Samples of Republicans and Democrats have been tested for their level of support for a new immigration policy.The test statistic is 0.54 and the critical region begins at ±\pm± 1.96.What may we conclude?

When testing for the significance of the difference between two sample means,which of the following is almost always unknown?

Random samples of men and women have been given a scale that measures their support for gun control.Men average 10.2 with standard deviation of 5.3.Women also average 10.2 but their standard deviation is 1.8.How could these results be dealt with appropriately?

When testing the significance of the difference between two sample proportions,the null hypothesis is

When random samples are drawn so that the selection of a case for one sample has no effect on the selection of cases for another sample,the samples are

Samples from two high schools are being tested for the difference in their average levels of prejudice.One sample contains 39 respondents and the other sample contains 47 respondents.The appropriate sampling distribution is the

When is the t distribution used instead of the Z distribution to test the significance of the difference between two sample proportions?

When conducting hypothesis tests for two sample means,the term m1 - m2 in the numerator of the formula reduces to zero because

The larger the sample size,the

The lower the alpha level,

Introduction

Basic Descriptive Statistics: Percentages Ratios and Rates Frequency Distributions

Charts and Graphs

Measures of Central Tendency

Measures of Dispersion

The Normal Curve

Introduction in Inferential Statistics, the Sampling Distribution, and Estimation

Hypothesis Testing I: the One-Sample Case

Hypothesis Testing III: the Analysis of Variance

Hypothesis Testing Iv: Chi Square

Introduction to Bivariate Association and Measures of Association for Variables Measured at the Nominal Level

Association Between Variables Measured at the Ordinal Level

Association Between Variables Measured at the Interval-Ratio Level

Partial Correlation and Multiple Regression and Correlation

Filters

Samples of Republicans and Democrats have been tested for their level of support for a new immigration policy.The test statistic is 0.54 and the critical region begins at $\pm$ 1.96.What may we conclude?

When conducting hypothesis tests for two sample means,the term m₁ - m₂ in the numerator of the formula reduces to zero because