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Average adult Americans are about one inch taller, but nearly a whopping

25 pounds heavier than they were in 1960, according to a new report from the Centers for Disease Control and Prevention (CDC). The bad news, says the CDC, is that average BMI (body mass index, a weight-for-height formula used to measure obesity) increased among adults from approximately 25 in 1960 to 28 in 2002." Boston is considered one of America's healthiest cities. Is the weight gain since 1960 similar in Boston? A sample of n = 25 adults suggested a mean increase of 17 pounds with a standard deviation of 8.6 pounds. Is Boston statistically significantly different in terms of weight gain since 1960? Run the appropriate test at a 5% level of significance. (15 pts)


Complete the following: (a) state the null and the research hypotheses, (b) identify the critical values of z or t used to "define the decision rule" (c) calculate the test statistic, (d) report the p-value, and (e) report your findings. Show all of your work.

Step-by-step answer

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