Question

_____11) If the null hypothesis is that the population mean is equal to 150 and a sample

                mean of 113 gave significant support against the null hypothesis, which of the

                following sample means would be certain to give support against the null

                 hypothesis.

    a) 114                              b.) 122                   c.) 264               d.) 112

_____12) If the p-value is less than the significance level, you would .

     a.) reject the null hypothesis         b.) accept the null hypothesis

     c.) accept the rejection region      d.) accept the test statistic

_____13) If the null hypothesis has been accepted and there truly exists a significant   

                 difference, what type of error has been made?

                 a) none                           b)   type II                    c) type I               d) type III

_____14) If a directional hypothesis is legitimate, which will have greater statistical power?

     a.) a one-tailed test                                   b.) a two-tailed test

     c.) both will have the same power            d.) you can’t run a two tailed test

15)___________     A study was conducted to test the effectiveness of aspirin on reducing

                                 fatal heart attacks. Two different groups were used in the study. The  

16)____________    control group (n = 20) received placebos and the experimental group

                                 (n = 20) received the aspirin. After four years, 10 of the control group

17____________     and 4 of the experimental group participants died of fatal heart attacks.

                                 Use a significance level of .01 and test to see if there was a significant               

                                 reduction in the number of fatal heart attacks in the experimental group.         

                                 List the 15) test statistic 16) P-value 17) whether to reject or accept Ho.  

                         

18)____________    The Mill Valley Brewery distributes soda bottles labeled 12 oz. The

                                   Bureau of Weights and Measurements randomly selects 40 of these

19)____________      bottles and measures their contents. They obtain a sample mean of 11.8

                                   oz and a sample standard deviation of 0.24 oz. Using a significance                                   

20)____________      level of .05, test the Bureau’s claim that the brewery is cheating   

                                   consumers. List the 18) test statistic   19) p-value   20) whether to accept

                                   or reject the null hypothesis.

Answer 1

11) Answer: c.) 264

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12) If the p-value is less than the significance level, you would .

Answer: a.) reject the null hypothesis

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13) If the null hypothesis has been accepted and there truly exists a significant difference, what type of error has been made?

Answer: b) type II  

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14) If a directional hypothesis is legitimate, which will have greater statistical power?

Answer: a.) a one-tailed test

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