When testing H0: $\mu$1 - $\mu$2 = 2,HA: $\mu$1 - $\mu$2 > 2,where 1 = 522, 2 = 516, $\sigma$12 = 28, $\sigma$22 = 24,n1= 40,n2 = 30,at $\alpha$ = .01,what is the test statistic?

A) 4.91 B) 2.33 C) 3.27 D) 2.67 A) 4.91 B) 2.33 C) 3.27 D) 2.67

Find a 95 percent confidence interval for µ1- µ2,where n1= 50,n2 = 75, 1 = 82, 2 = 76, $\sigma$12 = 8 and $\sigma$22 = 6.

A) (5.04 6.96) B) (5.53 6.47) C) (5.19 6.81) D) (5.41 6.59) A) (5.04 6.96) B) (5.53 6.47) C) (5.19 6.81) D) (5.41 6.59)

Calculate the t statistic for testing equality of means where 1 = 8.2, 2 = 11.3,s12 = 5.4,s22 = 5.2,n1= 6,n2 = 7.(Assume equal population variances)

A) -2.42 B) -1.05 C) -2.63 D) -4.86 A) -2.42 B) -1.05 C) -2.63 D) -4.86

Given two independent normal distributions with s12- s12 = 100,µ1= µ2 = 50,n1= n2 = 50,the sampling distribution of the mean difference 1- 2 will have a mean of _________.

A) 1 B) 0 C) 50 D) 100 A) 1 B) 0 C) 50 D) 100

Find a 95 percent confidence interval for µ1- µ2,where n1= 15,n2 = 10, 1 = 1.94, 2 = 1.04,s12 = .2025 and s22 = .0676.(Assume equal population variances)

A) (0.587 1.213) B) (0.848 0.952) C) (0.629 1.171) D) (0.573 1.227) A) (0.587 1.213) B) (0.848 0.952) C) (0.629 1.171) D) (0.573 1.227)

Exam 10: Statistical Inferences Based on Two Samples

In an opinion survey,a random sample of 1000 adults from the U.S.A and 1000 adults from Germany were asked whether they supported the death penalty.590 American adults and 560 German adults indicated that they supported the death penalty.The researcher wants to know if there is sufficient evidence to conclude that the proportion of adults who support the death penalty is higher in the U.S.A.than in Germany.What is the p-value for this test?

(Multiple Choice)

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Question 61

When testing H₀: $\mu$ ₁ - $\mu$ ₂ = 2,H_A: $\mu$ ₁ - $\mu$ ₂ > 2,where $When testing H0: \mu 1 - \mu 2 = 2,HA: \mu 1 - \mu 2 > 2,where 1 = 522, 2 = 516, \sigma 12 = 28, \sigma 22 = 24,n1= 40,n2 = 30,at \alpha = .01,what is the test statistic?$ ₁ = 522, $When testing H0: \mu 1 - \mu 2 = 2,HA: \mu 1 - \mu 2 > 2,where 1 = 522, 2 = 516, \sigma 12 = 28, \sigma 22 = 24,n1= 40,n2 = 30,at \alpha = .01,what is the test statistic?$ ₂ = 516, $\sigma$ ₁² = 28, $\sigma$ ₂² = 24,n₁= 40,n₂ = 30,at $\alpha$ = .01,what is the test statistic?

(Multiple Choice)

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Question 62

At = .10,testing the hypothesis that the proportion of Consumer (CON)industry companies winter quarter profit growth is more than 2% greater than the proportion of Banking (BKG)companies winter quarter profit growth,given that _CON= .20, _BKG= .14,n_CON = 300,n_BKG = 400,calculate the estimated standard deviation for the model.

(Multiple Choice)

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Question 63

In an experiment involving matched pairs,a sample of 12 pairs of observations is collected.The degree of freedom for the t statistic is 10.

(True/False)

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Question 64

Find a 95 percent confidence interval for µ₁- µ₂,where n₁= 50,n₂ = 75, $Find a 95 percent confidence interval for µ1- µ2,where n1= 50,n2 = 75, 1 = 82, 2 = 76, \sigma 12 = 8 and \sigma 22 = 6.$ ₁ = 82, $Find a 95 percent confidence interval for µ1- µ2,where n1= 50,n2 = 75, 1 = 82, 2 = 76, \sigma 12 = 8 and \sigma 22 = 6.$ ₂ = 76, $\sigma$ ₁² = 8 and $\sigma$ ₂² = 6.

(Multiple Choice)

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Question 65

In testing the difference between the means of two normally distributed populations using large,independent random samples with known variances,the correct test statistic to use is:

(Multiple Choice)

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Question 66

Let p₁ represent the population proportion of U.S.Senate and Congress (House of Representatives)democrats who are in favor of a new modest tax on "junk food".Let p₂ represent the population proportion of U.S.Senate and Congress (House of Representative)republicans who are in favor of a new modest tax on "junk food".Out of the 265 democratic senators and congressman 106 of them are in favor of a "junk food" tax.Out of the 285 republican senators and congressman only 57 of them are in favor of a "junk food" tax.At = .01,can we conclude that the proportion of democrats who favor "junk food" tax is more than 5% higher than proportion of republicans who favor the new tax?

(Multiple Choice)

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Question 67

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. $The registrar at a state college is interested in determining whether there is a difference of more than one credit hour between male and female students in the average number of credit hours taken during a term.She selected a random sample of 60 male and 60 female students and observed the following sample information. What do you conclude if z = 1.73 at \alpha = .01?$ What do you conclude if z = 1.73 at $\alpha$ = .01?

(Multiple Choice)

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Question 68

Two hospital emergency rooms use different procedures for triage of their patients.We want to test the claim that the mean waiting time of patients is the same for both hospitals.The 40 randomly selected subjects from one hospital produce a mean of 18.3 minutes.The 50 randomly selected patients from the other hospital produce a mean of 25.31 minutes.Assume a $\sigma$ _a = 2.1 minutes and $\sigma$ _b = 2.92 minutes.What do you conclude about the waiting time for patients in the two hospitals testing at $\alpha$ = .001?

(Multiple Choice)

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Question 69

If we are testing the hypothesis about the mean of a population of paired differences with samples of n₁ = 10,n₂ = 10,the degrees of freedom for the t statistic is ____.

(Multiple Choice)

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Question 70

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.Test the hypothesis at = .05

(Multiple Choice)

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Question 71

Calculate the t statistic for testing equality of means where ₁ = 8.2, ₂ = 11.3,s₁² = 5.4,s₂² = 5.2,n₁= 6,n₂ = 7.(Assume equal population variances)

(Multiple Choice)

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Question 72

In testing the equality of population variances,two assumptions are required: independent samples and normally distributed populations.

(True/False)

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Question 73

In an opinion survey,a random sample of 1000 adults from the U.S.A and 1000 adults from Germany were asked whether they supported the death penalty.590 American adults and 560 German adults indicated that they supported the death penalty.The researcher wants to know if there is sufficient evidence to conclude that the proportion of adults who support the death penalty is higher in the U.S.A.than in Germany.What is the rejection point (critical value of the test statistic)at = .05?

(Multiple Choice)

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Question 74

Given two independent normal distributions with s₁²- s₁² = 100,µ₁= µ₂ = 50,n₁= n₂ = 50,the sampling distribution of the mean difference ₁- ₂ will have a mean of _________.

(Multiple Choice)

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Question 75

When testing the difference between two proportions selected from populations with large independent samples,the Z test statistic is used.

(True/False)

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Question 76

In order to test the effectiveness of a drug called XZR designed to reduce cholesterol levels,9 heart patients' cholesterol levels are measured before they are given the drug.The same 9 patients use XZR for two continuous months.After two months of continuous use the 9 patients' cholesterol levels are measured again.The comparison of cholesterol levels before vs.after administering the drug is an example of testing the difference between:

(Multiple Choice)

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Question 77

In testing for the equality of means from two independent populations,if the null hypothesis is rejected,the test could result in:

(Multiple Choice)

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Question 78

In testing the difference between the means of two independent populations,if neither population is normally distributed,then the sampling distribution of the difference in means will be approximately normal provided that the sum of the sample sizes obtained from the two populations are at least 30.

(True/False)

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Question 79

Find a 95 percent confidence interval for µ₁- µ₂,where n₁= 15,n₂ = 10, ₁ = 1.94, ₂ = 1.04,s₁² = .2025 and s₂² = .0676.(Assume equal population variances)

(Multiple Choice)

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Question 80

Showing 61 - 80 of 132

In an experiment involving matched pairs,a sample of 12 pairs of observations is collected.The degree of freedom for the t statistic is 10.

In testing the difference between the means of two normally distributed populations using large,independent random samples with known variances,the correct test statistic to use is:

If we are testing the hypothesis about the mean of a population of paired differences with samples of n₁ = 10,n₂ = 10,the degrees of freedom for the t statistic is ____.

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.Test the hypothesis at = .05

Calculate the t statistic for testing equality of means where ₁ = 8.2, ₂ = 11.3,s₁² = 5.4,s₂² = 5.2,n₁= 6,n₂ = 7.(Assume equal population variances)

In testing the equality of population variances,two assumptions are required: independent samples and normally distributed populations.

Given two independent normal distributions with s₁²- s₁² = 100,µ₁= µ₂ = 50,n₁= n₂ = 50,the sampling distribution of the mean difference ₁- ₂ will have a mean of _________.

When testing the difference between two proportions selected from populations with large independent samples,the Z test statistic is used.

In testing for the equality of means from two independent populations,if the null hypothesis is rejected,the test could result in:

In testing the difference between the means of two independent populations,if neither population is normally distributed,then the sampling distribution of the difference in means will be approximately normal provided that the sum of the sample sizes obtained from the two populations are at least 30.

Find a 95 percent confidence interval for µ₁- µ₂,where n₁= 15,n₂ = 10, ₁ = 1.94, ₂ = 1.04,s₁² = .2025 and s₂² = .0676.(Assume equal population variances)

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 H0: μ\muμ 1 - μ\muμ 2 = 2,HA: μ\muμ 1 - μ\muμ 2 > 2,where 1 = 522, 2 = 516, σ\sigmaσ 12 = 28, σ\sigmaσ 22 = 24,n1= 40,n2 = 30,at α\alphaα = .01,what is the test statistic?

In an experiment involving matched pairs,a sample of 12 pairs of observations is collected.The degree of freedom for the t statistic is 10.

Find a 95 percent confidence interval for µ1- µ2,where n1= 50,n2 = 75, 1 = 82, 2 = 76, σ\sigmaσ 12 = 8 and σ\sigmaσ 22 = 6.

In testing the difference between the means of two normally distributed populations using large,independent random samples with known variances,the correct test statistic to use is:

If we are testing the hypothesis about the mean of a population of paired differences with samples of n1 = 10,n2 = 10,the degrees of freedom for the t statistic is ____.

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.Test the hypothesis at = .05

Calculate the t statistic for testing equality of means where 1 = 8.2, 2 = 11.3,s12 = 5.4,s22 = 5.2,n1= 6,n2 = 7.(Assume equal population variances)

In testing the equality of population variances,two assumptions are required: independent samples and normally distributed populations.

Given two independent normal distributions with s12- s12 = 100,µ1= µ2 = 50,n1= n2 = 50,the sampling distribution of the mean difference 1- 2 will have a mean of _________.

When testing the difference between two proportions selected from populations with large independent samples,the Z test statistic is used.

In testing for the equality of means from two independent populations,if the null hypothesis is rejected,the test could result in:

Find a 95 percent confidence interval for µ1- µ2,where n1= 15,n2 = 10, 1 = 1.94, 2 = 1.04,s12 = .2025 and s22 = .0676.(Assume equal population variances)

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

If we are testing the hypothesis about the mean of a population of paired differences with samples of n₁ = 10,n₂ = 10,the degrees of freedom for the t statistic is ____.

Calculate the t statistic for testing equality of means where ₁ = 8.2, ₂ = 11.3,s₁² = 5.4,s₂² = 5.2,n₁= 6,n₂ = 7.(Assume equal population variances)

Given two independent normal distributions with s₁²- s₁² = 100,µ₁= µ₂ = 50,n₁= n₂ = 50,the sampling distribution of the mean difference ₁- ₂ will have a mean of _________.

Find a 95 percent confidence interval for µ₁- µ₂,where n₁= 15,n₂ = 10, ₁ = 1.94, ₂ = 1.04,s₁² = .2025 and s₂² = .0676.(Assume equal population variances)