# DAT 565 Practice Week 4 Knowledge Check

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1)      John rejected his null hypothesis in a right-tailed test for a mean at α = .025 because his critical t value was 2.000 and his calculated t value was 2.345. We can be sure that

2)      A corporate analyst is testing whether mean inventory turnover has increased. Inventory turnover in six randomly chosen product distribution centers (PDCs) is shown.

3)      To compare the cost of three shipping methods, a random sample of four shipments is taken for each of three firms. The cost per shipment is shown below.

4)      Three bottles of wine are tasted by three experts. Each rater assigns a rating (scale is from 1=terrible to 10=superb). Which test would you use for the most obvious hypothesis?

5)      Which is an invalid alternative hypothesis?

6)      Randomly chosen MBA students were asked their opinions about the ideal number of children for a married couple. The sample data were entered into MegaStat, and the following results were produced.

7)      What conclusion can you draw from this analysis at α = .05?

8)      When testing the hypothesis H0: μ = 100 with n = 100 and σ2 = 100, we find that the sample mean is 97. The test statistic is

9)      To compare the cost of three shipping methods, a firm ships material to each of four different destinations over a six-month period. The average cost per shipment is shown below.

10)  Here is an Excel ANOVA table that summarizes the results of an experiment to assess the effects of ambient noise level and plant location on worker productivity. The test used α = .05.

Systolic blood pressure of randomly selected HMO patients was recorded on a particular Wednesday, with the results shown here:

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