Business Statistics Need Fast

The independent t-test is based on which distribution?
@Answer found in section 4.5 The Independent Samples t-Test, in Statistics for Managers

 The distribution of difference scores.
 The distribution of sample means.
 The distribution of error scores.
 The distribution of z.

Statistical significance for a tested mean difference means practical significance as well. 

 True 
 False 

The mean of the distribution of sample means will have the same value as the mean of the distribution of individual scores upon which it is based. 

 True 
 False 

The z-test can be used to test mean differences even when the initial data set is not normally distributed.

 True 
 False 

The standard error of the mean is actually the standard deviation of all of the means that make up the distribution of sample means.

 True 
 False 

What is the alternate hypothesis in a problem where sales group two is predicted to be “. . . significantly less productive than sales group one?”
@Answer found in sections 4.3 The One-sample t-Test and 4.4 Hypothesis Testing, in Statistics for Managers

 HA: μ1
≠ μ 2
 HA: μ 1μ 2 
 HA: μ 1μ
 HA: μ 1μ 2

Which of the following defines statistical significance? 

 The outcome is unlikely to have occurred by chance.
 The outcome is important.
 The outcome is unusual.
 The outcome is one that can be explained by normal circumstances.

 
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