1. To determine if the choice of cereal is related to income, one should use a s

Question

1. To determine if the choice of cereal is related to income, one should use a significance test based on

A. the Z-distribution. B. the t-distribution. C. the F-distribution. D. the 2 -distribution.

2. One factor in low productivity is the amount of time wasted by workers. Wasted time includes time spent cleaning up mistakes, waiting for more material and equipment, and performing any other activity not related to production. In a project designed to examine this problem, an operations management consultant took a survey of 200 workers in companies that were classified as successful (on the basis of their latest annual profits) and another 200 workers from unsuccessful companies. The amount of time (in hours) wasted during a standard 40- hour workweek was recorded for each worker. Successful (1) Unsuccessful (2) Sample Summaries Data Set #1 Data Set #1 Sample Size 200 200 Sample Mean 5.017 7.802 Sample Std Dev 1.393 3.094 The test that should be used to determine if more time is wasted in unsuccessful companies than is successful companies is

A. F-test

B. 2-sample Z for proportions using a pooled proportion

C. 2-sample t test for means assuming unequal population variances

D. Paired t-test

E. Chi-square test of homogeneity

Explanation / Answer

Answers:

1) A) Z - distribution

2) C) 2- sample t test for means assuming unequal population variances

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