In testing the difference between the means of two normally distributed populations,if µ1 = µ2 = 50,n1= 9,n2 = 13,the degrees of freedom for the t statistic is ___________.

A) 22 B) 21 C) 19 D) 20 A) 22 B) 21 C) 19 D) 20

Exam 10: Statistical Inferences Based on Two Samples

A test of spelling ability is given to a random sample of 10 students before and after they completed a spelling course.The mean score before the course was 119.60 and after the course the mean score was 130.80.The standard deviation of the difference was 16.061.Calculate the test statistic to test the claim.

(Multiple Choice)

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Question 41

When testing the difference between two population proportions using large independent random samples,__________ test statistic is used.

(Multiple Choice)

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Question 42

An independent samples experiment is an experiment in which there is no relationship between the measurements in the different samples.

(True/False)

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Question 43

The test of means for two related populations match the observations (matched pairs)in order to reduce the ________________ attributable to the difference between individual observations and other factors.

(Multiple Choice)

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Question 44

In testing the difference between the means of two normally distributed populations using large independent random samples,the sample sizes from the two populations must be equal in order to use a Z statistic.

(True/False)

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Question 45

An experiment in which there is no relationship between the measurements on the different samples is a(n)______ experiment.

(Multiple Choice)

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Question 46

If the limits of the confidence interval of the difference between the means of two normally distributed populations were 8.5 and 11.5 at the 95% confidence level,then we can conclude that we are 95% certain that there is a significant difference between the two population means.

(True/False)

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Question 47

Use the following data and a test of the equality of variances for two populations at $\alpha$ = .10,where sample 1 is randomly selected from population 1 and sample 2 is randomly selected from population 2.Identify the critical value used for testing the equality of the variances. $Use the following data and a test of the equality of variances for two populations at \alpha = .10,where sample 1 is randomly selected from population 1 and sample 2 is randomly selected from population 2.Identify the critical value used for testing the equality of the variances.$

(Multiple Choice)

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Question 48

Given the following information about a hypothesis test of the difference between two variances based on independent random samples,what is the critical value of the test statistic at a significance level of .05? Assume that the samples are obtained from normally distributed populations. H_A: $\sigma$ ²_A> $\sigma$ ²_B, $Given the following information about a hypothesis test of the difference between two variances based on independent random samples,what is the critical value of the test statistic at a significance level of .05? Assume that the samples are obtained from normally distributed populations. HA: \sigma 2A> \sigma 2B, 1 = 12, 2 = 9,s1 = 5,s2 = 3,n1 = 13,n2 = 10.$ ₁ = 12, $Given the following information about a hypothesis test of the difference between two variances based on independent random samples,what is the critical value of the test statistic at a significance level of .05? Assume that the samples are obtained from normally distributed populations. HA: \sigma 2A> \sigma 2B, 1 = 12, 2 = 9,s1 = 5,s2 = 3,n1 = 13,n2 = 10.$ ₂ = 9,s₁ = 5,s₂ = 3,n₁ = 13,n₂ = 10.

(Multiple Choice)

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Question 49

If the limits of the confidence interval of the difference between the means of two normally distributed populations were from -2.6 and 1.4 at the 95% confidence level,then we can conclude that we are 95% certain that there is a significant difference between the two population means.

(True/False)

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Question 50

The registrar at a state college is interested in determining whether there is a difference of more than one credit hour between male and female students in the average number of credit hours taken during a term.She selected a random sample of 60 male and 60 female students and observed the following sample information. Calculate the test statistic to be used in the analysis.

(Multiple Choice)

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Question 51

In comparing the difference between two independent population means,by using two small independent samples,the sampling distributions of the population means are at least approximately ________________.

(Multiple Choice)

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Question 52

Suppose that a realtor is interested in comparing the price of midrange homes in two cities in a Midwestern state.She conducts a small survey in the two cities looking at the price of midrange homes.Assume equal population variances. Calculate the 95% confidence interval where pooled variance = 4335357.143

(Multiple Choice)

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Question 53

In testing the difference between the means of two normally distributed populations,if µ₁ = µ₂ = 50,n₁= 9,n₂ = 13,the degrees of freedom for the t statistic is ___________.

(Multiple Choice)

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Question 54

A fast food company uses two management-training methods.Method 1 is a traditional method of training and Method 2 is a new and innovative method.The company has just hired 31 new management trainees.15 of the trainees are randomly selected and assigned to the first method,and the remaining 16 trainees are assigned to the second training method.After three months of training,the management trainees took a standardized test.The test was designed to evaluate their performance and learning from training.The sample mean score and sample standard deviation of the two methods are given below.The management wants to determine if the company should implement the new training method. What is the sample value of the test statistic? (Assume equal population variances)

(Multiple Choice)

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Question 55

When testing the difference for the population of paired differences in which two different observations are taken on the same units,the correct test statistic to use is ____.

(Multiple Choice)

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Question 56

Given the following information about a hypothesis test of the difference between two means based on independent random samples,which one of the following is the correct rejection region at a significance level of .05? H_A: µ_A> µ_B, ₁ = 12, ₂ = 9,s₁ = 4,s₂ = 2,n₁ = 13,n₂ = 10.

(Multiple Choice)

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Question 57

Assume that we are constructing confidence interval for the difference in the means of two populations based on independent random samples.If both sample sizes and the distribution of both populations are highly skewed,then a confidence interval for the difference in the means can be constructed using the t test statistic.

(True/False)

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Question 58

In which of the following tests is the variable of interest the difference between the values of the observations from the two samples rather than the actual observations themselves?

(Multiple Choice)

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Question 59

In testing the difference between two independent population means,it is assumed that the level of measurement is at least ______________.

(Multiple Choice)

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Question 60

Showing 41 - 60 of 132

When testing the difference between two population proportions using large independent random samples,__________ test statistic is used.

An independent samples experiment is an experiment in which there is no relationship between the measurements in the different samples.

The test of means for two related populations match the observations (matched pairs)in order to reduce the ________________ attributable to the difference between individual observations and other factors.

In testing the difference between the means of two normally distributed populations using large independent random samples,the sample sizes from the two populations must be equal in order to use a Z statistic.

An experiment in which there is no relationship between the measurements on the different samples is a(n)______ experiment.

If the limits of the confidence interval of the difference between the means of two normally distributed populations were 8.5 and 11.5 at the 95% confidence level,then we can conclude that we are 95% certain that there is a significant difference between the two population means.

If the limits of the confidence interval of the difference between the means of two normally distributed populations were from -2.6 and 1.4 at the 95% confidence level,then we can conclude that we are 95% certain that there is a significant difference between the two population means.

In comparing the difference between two independent population means,by using two small independent samples,the sampling distributions of the population means are at least approximately ________________.

In testing the difference between the means of two normally distributed populations,if µ₁ = µ₂ = 50,n₁= 9,n₂ = 13,the degrees of freedom for the t statistic is ___________.

When testing the difference for the population of paired differences in which two different observations are taken on the same units,the correct test statistic to use is ____.

Given the following information about a hypothesis test of the difference between two means based on independent random samples,which one of the following is the correct rejection region at a significance level of .05? H_A: µ_A> µ_B, ₁ = 12, ₂ = 9,s₁ = 4,s₂ = 2,n₁ = 13,n₂ = 10.

In which of the following tests is the variable of interest the difference between the values of the observations from the two samples rather than the actual observations themselves?

In testing the difference between two independent population means,it is assumed that the level of measurement is at least ______________.

An Introduction to Business Statistics

Descriptive Statistics: Tabular and Graphical Methods

Descriptive Statistics: Numerical Methods

Probability

Discrete Random Variables

Continuous Random Variables

Sampling and Sampling Distributions

Confidence Intervals

Hypothesis Testing

Experimental Design and Analysis of Variance

Chi-Square Tests

Simple Linear Regression Analysis

Multiple Regression

Model Building and Model Diagnostics

Time Series Forecasting

Process Improvement Using Control Charts

Nonparametric Methods

Decision Theory

Filters

Exam 10: Statistical Inferences Based on Two Samples

When testing the difference between two population proportions using large independent random samples,__________ test statistic is used.

An independent samples experiment is an experiment in which there is no relationship between the measurements in the different samples.

The test of means for two related populations match the observations (matched pairs)in order to reduce the ________________ attributable to the difference between individual observations and other factors.

In testing the difference between the means of two normally distributed populations using large independent random samples,the sample sizes from the two populations must be equal in order to use a Z statistic.

An experiment in which there is no relationship between the measurements on the different samples is a(n)______ experiment.

If the limits of the confidence interval of the difference between the means of two normally distributed populations were 8.5 and 11.5 at the 95% confidence level,then we can conclude that we are 95% certain that there is a significant difference between the two population means.

Use the following data and a test of the equality of variances for two populations at α\alphaα = .10,where sample 1 is randomly selected from population 1 and sample 2 is randomly selected from population 2.Identify the critical value used for testing the equality of the variances.

If the limits of the confidence interval of the difference between the means of two normally distributed populations were from -2.6 and 1.4 at the 95% confidence level,then we can conclude that we are 95% certain that there is a significant difference between the two population means.

In comparing the difference between two independent population means,by using two small independent samples,the sampling distributions of the population means are at least approximately ________________.

In testing the difference between the means of two normally distributed populations,if µ1 = µ2 = 50,n1= 9,n2 = 13,the degrees of freedom for the t statistic is ___________.

When testing the difference for the population of paired differences in which two different observations are taken on the same units,the correct test statistic to use is ____.

Given the following information about a hypothesis test of the difference between two means based on independent random samples,which one of the following is the correct rejection region at a significance level of .05? HA: µA> µB, 1 = 12, 2 = 9,s1 = 4,s2 = 2,n1 = 13,n2 = 10.

In which of the following tests is the variable of interest the difference between the values of the observations from the two samples rather than the actual observations themselves?

In testing the difference between two independent population means,it is assumed that the level of measurement is at least ______________.

An Introduction to Business Statistics

Descriptive Statistics: Tabular and Graphical Methods

Descriptive Statistics: Numerical Methods

Probability

Discrete Random Variables

Continuous Random Variables

Sampling and Sampling Distributions

Confidence Intervals

Hypothesis Testing

Experimental Design and Analysis of Variance

Chi-Square Tests

Simple Linear Regression Analysis

Multiple Regression

Model Building and Model Diagnostics

Time Series Forecasting

Process Improvement Using Control Charts

Nonparametric Methods

Decision Theory

Filters

In testing the difference between the means of two normally distributed populations,if µ₁ = µ₂ = 50,n₁= 9,n₂ = 13,the degrees of freedom for the t statistic is ___________.

Given the following information about a hypothesis test of the difference between two means based on independent random samples,which one of the following is the correct rejection region at a significance level of .05? H_A: µ_A> µ_B, ₁ = 12, ₂ = 9,s₁ = 4,s₂ = 2,n₁ = 13,n₂ = 10.