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Chapter 9: Q. 67 (page 588)
Attitudes In the study of older students鈥� 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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Ages of presidents Joe is writing a report on the backgrounds of American presidents. He looks up the ages of all the presidents when they entered office. Because Joe took a statistics course, he uses these numbers to perform a significance test about the mean age of all U.S. presidents. Explain why this makes no sense.
Which of the following confidence intervals would lead us to reject H0 : in favor of
Ha :p not equal to at the significance level?
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鈥檚 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鈥� suspicion? Carry out a test pg to help you answer this question.
In planning a study of the birth weights of babies whose mothers did not see a
doctor before delivery, a researcher states the hypotheses as
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?
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