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Chapter 9: Q. 67 (page 588)
Attitudes In the study of older students’ attitudes from Exercise , the sample mean SSHA score was and the sample standard deviation was .
(a) Calculate the test statistic.
(b) Find the P-value using Table . Then obtain a more precise P-value from your calculator.
a.
b.. Using calculator
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What is significance good for? Which of the following questions does a significance test answer? Justify your answer.
(a) Is the sample or experiment properly designed?
(b) Is the observed effect due to chance?
(c) Is the observed effect important?
Would the hypothesis that be rejected at the level in favor of a two-sided alternative? Justify your answer.
The P-value for a two-sided test of the null hypothesis is
(a) Does theconfidence interval forinclude ? Why or why not?
(b) Does the confidence interval forinclude ? Why or why not
Healthy bones The recommended daily allowance (RDA) of calcium for women between the ages of and years is milligrams (mg). Researchers who were involved in a large-scale study of women’s bone health suspected that their participants had significantly lower calcium intakes than the RDA. To test this suspicion, the researchers measured the daily calcium intake of a random sample of women from the study who fell in the desired age range. The Minitab output below displays descriptive statistics for these data, along with the results of a significance test.
(a) Determine whether there are any outliers. Show your work.
(b) Interpret the P-value in context.
(c) Do these data give convincing evidence to support the researchers’ suspicion? Carry out a test pg to help you answer this question.
Does Friday the have an effect on people's behavior? Researchers collected data on the numbers of shoppers at a sample of different grocery stores on Friday the and Friday the in the same month. The dotplot and computer output below summarize the data on the difference in the number of shoppers at each store on these two days (subtracting in the order minus ).
Researchers would like to carry out a test of versus , where is the true mean difference in the number of grocery shoppers on these two days. Which of the following conditions for performing a paired test is not met?
1. Random
II. Normal
III. Independent
(a) I only
(b) II only
(c) III only
d) I and II only
(e) I, II, and III
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