Question

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 has 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? Apply the appropriate test at a 5% level of significance.

1)critical t value: +/-

2)Computed statistic:

Based on comparing the computed statistic to the critical value which of the following is (are) true?

a)There is significant evidence, alpha=0.05, that the BMI for Boston residents is significantly different than 25.

b)There is not significant evidence, alpha=0.05, that the BMI for Boston residents is significantly different than 25.

c)Statistically speaking the difference between the BMI for Boston residents and a BMI of 25 is 0

d) b and c

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