Explain the difference between the null hypothesis and alternative hypothesis. Which one can be proven in a statistical sense?

How can you determine when to use a lower one‐tailed test of hypothesis versus an upper one‐tailed test?
 
Explain the purpose of the chi‐square test for independence. Provide some practical examples where this test might be used in business.

Explain the difference between simple and multiple linear regression.
 
Explain what is the coefficient of determination, R^2 (Rsquared)? What does it measure?
Part 1 of 1  
Question 1 of 4  25.0 Points 
Solve Problem and Applications:Solve Problem and Applications:ch 5 prob1 (use excel file Call Center Data)
51: 1. Call centers typically have high turnover. The director of human resources for a large bank has compiled data on about 70 former employees at one of the bank’s call centers in the Excel file Call Center Data . In writing an article about call center working conditions, a reporter has claimed that the average tenure is no more than two years.
As you formulate and test a hypothesis using these data, how should the null and alternative hypothesis statements be written?
A.Ho: The average employee tenure is < 2.0 H1: The average employee tenure is ≥ 2.0 

B.Ho: The average employee tenure is ≥ 2.0 H1: The average employee tenure is < 2.0 

C.Ho: The average employee tenure is ≥ 2.0 H1: The average employee tenure is > 2.0 

D.Ho: The average employee tenure is > 2.0 H1: The average employee tenure is < 2.0 

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Question 2 of 4  25.0 Points 
Solve Problem and Applications:Solve Problem and Applications:ch 5 prob1 (use excel file Call Center Data)
51: 1. Call centers typically have high turnover. The director of human resources for a large bank has compiled data on about 70 former employees at one of the bank’s call centers in the Excel file Call Center Data . In writing an article about call center working conditions, a reporter has claimed that the average tenure is no more than two years.
As you formulate and test a hypothesis using these data, what is the value of the t Test Statistic?
A.0.5 

B.1.89 

C. 0.84 

D.0.0 

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Question 3 of 4  25.0 Points 
Solve Problem and Applications:Solve Problem and Applications:ch 5 prob1 (use excel file Call Center Data)
51: 1. Call centers typically have high turnover. The director of human resources for a large bank has compiled data on about 70 former employees at one of the bank’s call centers in the Excel file Call Center Data . In writing an article about call center working conditions, a reporter has claimed that the average tenure is no more than two years.
As you formulate and test a hypothesis using these data, what is the Critical Value?
A.1.667 

B.2.0 

C.1.5 

D.0.0 

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Question 4 of 4  25.0 Points 
Solve Problem and Applications:Solve Problem and Applications:ch 5 prob1 (use excel file Call Center Data)
51: 1. Call centers typically have high turnover. The director of human resources for a large bank has compiled data on about 70 former employees at one of the bank’s call centers in the Excel file Call Center Data . In writing an article about call center working conditions, a reporter has claimed that the average tenure is no more than two years.
As you formulate and test a hypothesis using these data, what is your final conclusion?
A.Reject the null hypothesis 
 
B.Do not reject the null hypothesis 
 
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