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Business Statistics Need Fast

/in /by

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 ;

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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 ;1= ;μ ;2 ;
;HA: ;μ ;1> ;μ2 ;
;HA: ;μ ;1< ;μ ;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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