When testing H0: $\sigma$12= $\sigma$12,HA: $\sigma$12> $\sigma$22 at $\alpha$ = .01 where n1 = 5,n2= 6,s12 = 15750,s22 = 10920 what critical value do we use?

A) 2.821 B) 11.39 C) 8.75 D) 1.443 A) 2.821 B) 11.39 C) 8.75 D) 1.443 B

Exam 10: Statistical Inferences Based on Two Samples

When testing H₀: $\sigma$ ₁²= $\sigma$ ₁²,H_A: $\sigma$ ₁²> $\sigma$ ₂² at $\alpha$ = .01 where n₁ = 5,n₂= 6,s₁² = 15750,s₂² = 10920 what critical value do we use?

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Question 1

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In a market research study conducted by a local winery on white wine preference,the following results were found.Of a sample of 500 men,120 preferred white wine and of a sample of 500 women,210 preferred white wine.Setup the alternative hypothesis that will test the claim that the percentage of women preferring white wine is 25% higher than men.

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Question 2

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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.What do you conclude at $\alpha$ = .01?

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Question 3

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With a 90 percent confidence interval for the difference between the proportions of failures in factory 1 and factory 2 where $With a 90 percent confidence interval for the difference between the proportions of failures in factory 1 and factory 2 where 1 = .05, 2 = .04,n1= 500,n2 = 2000 of (-.0076 .0276)can we reject the null hypothesis at \alpha = .10?$ ₁ = .05, $With a 90 percent confidence interval for the difference between the proportions of failures in factory 1 and factory 2 where 1 = .05, 2 = .04,n1= 500,n2 = 2000 of (-.0076 .0276)can we reject the null hypothesis at \alpha = .10?$ ₂ = .04,n₁= 500,n₂ = 2000 of (-.0076 .0276)can we reject the null hypothesis at $\alpha$ = .10?

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Question 4

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. $A fast food company uses two management-training methods.Method 1 is a traditional method of training and Method 2 is a new and innovative method.The company has just hired 31 new management trainees.15 of the trainees are randomly selected and assigned to the first method,and the remaining 16 trainees are assigned to the second training method.After three months of training,the management trainees took a standardized test.The test was designed to evaluate their performance and learning from training.The sample mean score and sample standard deviation of the two methods are given below.The management wants to determine if the company should implement the new training method. What is the absolute value of the rejection point (critical value of the test statistic)at \alpha = .01?$ What is the absolute value of the rejection point (critical value of the test statistic)at $\alpha$ = .01?

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Question 5

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

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Question 6

In testing the difference between two means from two normally distributed independent populations,the distribution of the difference in sample means will be:

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Question 7

In testing the difference between the means of two normally distributed populations using small independent random samples,the most appropriate test statistic is the _________ statistic.

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Question 8

Given the following information about a hypothesis test of the difference between two means based on independent random samples,what is the standard deviation of the difference between the two means? Assume that the samples are obtained from normally distributed populations having equal variances. H_A: µ_A> µ_B, ₁ = 12, ₂ = 9,s₁ = 5,s₂ = 3,n₁ = 13,n₂ = 10.

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Question 9

In testing the equality of population variance,what assumption(s)should be considered?

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Question 10

A new company is in the process of evaluating its customer service.The company offers two types of sales: 1.Internet sales;2.Store sales.The marketing research manager believes that the Internet sales are more than 10% higher than store sales.The alternative hypothesis for this problem would be stated as:

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Question 11

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. Write the null hypothesis.

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Question 12

A new company is in the process of evaluating its customer service.The company offers two types of sales: 1.Internet sales;2.Store sales.The marketing research manager believes that the Internet sales are more than 10% higher than store sales.The null hypothesis would be:

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Question 13

In general,the shape of the F distribution is _________.

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Question 14

What is the value of the computed F-statistic for testing equality of population variances where s₁² = .004,s₂² = .002? Consider H_A: $\sigma$ ₁²> $\sigma$ ₂².

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Question 15

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. $A fast food company uses two management-training methods.Method 1 is a traditional method of training and Method 2 is a new and innovative method.The company has just hired 31 new management trainees.15 of the trainees are randomly selected and assigned to the first method,and the remaining 16 trainees are assigned to the second training method.After three months of training,the management trainees took a standardized test.The test was designed to evaluate their performance and learning from training.The sample mean score and sample standard deviation of the two methods are given below.The management wants to determine if the company should implement the new training method. What is the absolute value of the rejection point (critical value of the test statistic)at \alpha = .05?$ What is the absolute value of the rejection point (critical value of the test statistic)at $\alpha$ = .05?

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Question 16

A financial analyst working for a financial consulting company wishes to find evidence that the average price-to-earnings ratio in the consumer industry is higher than average price-to-earnings ratio in banking industry.The alternative hypothesis is:

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Question 17

A coffee shop franchise owner is looking at two possible locations for a new shop.To help make a decision he looks at the number of pedestrians that go by each of the two locations in one-hour segments.At location A,counts are taken for 35 one-hour units and with a mean number of pedestrians of 421 and a sample standard deviation of 122.At the second location (B),counts are taken for 50 one hour units with a mean number of pedestrians of 347 and a sample standard deviation of 85.Assume the two populations variances are not known but are equal.Calculate a 95% confidence interval for the difference in pedestrian traffic at the two locations.(pooled estimate of = 22.4)

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Question 18

Find a 98 percent confidence interval for the paired difference. .

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Question 19

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 the administration of the drug is an example of testing the difference between two ____________

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Question 20

Showing 1 - 20 of 132

When testing H₀: $\sigma$ ₁²= $\sigma$ ₁²,H_A: $\sigma$ ₁²> $\sigma$ ₂² at $\alpha$ = .01 where n₁ = 5,n₂= 6,s₁² = 15750,s₂² = 10920 what critical value do we use?

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

In testing the difference between two means from two normally distributed independent populations,the distribution of the difference in sample means will be:

In testing the difference between the means of two normally distributed populations using small independent random samples,the most appropriate test statistic is the _________ statistic.

In testing the equality of population variance,what assumption(s)should be considered?

A new company is in the process of evaluating its customer service.The company offers two types of sales: 1.Internet sales;2.Store sales.The marketing research manager believes that the Internet sales are more than 10% higher than store sales.The null hypothesis would be:

In general,the shape of the F distribution is _________.

What is the value of the computed F-statistic for testing equality of population variances where s₁² = .004,s₂² = .002? Consider H_A: $\sigma$ ₁²> $\sigma$ ₂².

A financial analyst working for a financial consulting company wishes to find evidence that the average price-to-earnings ratio in the consumer industry is higher than average price-to-earnings ratio in banking industry.The alternative hypothesis is:

Find a 98 percent confidence interval for the paired difference. .

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: σ\sigmaσ 12= σ\sigmaσ 12,HA: σ\sigmaσ 12> σ\sigmaσ 22 at α\alphaα = .01 where n1 = 5,n2= 6,s12 = 15750,s22 = 10920 what critical value do we use?

With a 90 percent confidence interval for the difference between the proportions of failures in factory 1 and factory 2 where 1 = .05, 2 = .04,n1= 500,n2 = 2000 of (-.0076 .0276)can we reject the null hypothesis at α\alphaα = .10?

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

In testing the difference between two means from two normally distributed independent populations,the distribution of the difference in sample means will be:

In testing the difference between the means of two normally distributed populations using small independent random samples,the most appropriate test statistic is the _________ statistic.

In testing the equality of population variance,what assumption(s)should be considered?

A new company is in the process of evaluating its customer service.The company offers two types of sales: 1.Internet sales;2.Store sales.The marketing research manager believes that the Internet sales are more than 10% higher than store sales.The null hypothesis would be:

In general,the shape of the F distribution is _________.

What is the value of the computed F-statistic for testing equality of population variances where s12 = .004,s22 = .002? Consider HA: σ\sigmaσ 12> σ\sigmaσ 22.

A financial analyst working for a financial consulting company wishes to find evidence that the average price-to-earnings ratio in the consumer industry is higher than average price-to-earnings ratio in banking industry.The alternative hypothesis is:

Find a 98 percent confidence interval for the paired difference. .

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

When testing H₀: $\sigma$ ₁²= $\sigma$ ₁²,H_A: $\sigma$ ₁²> $\sigma$ ₂² at $\alpha$ = .01 where n₁ = 5,n₂= 6,s₁² = 15750,s₂² = 10920 what critical value do we use?

What is the value of the computed F-statistic for testing equality of population variances where s₁² = .004,s₂² = .002? Consider H_A: $\sigma$ ₁²> $\sigma$ ₂².