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# Manually calculating the t-statistic Aa Aa a An obstetrician wonders whether his patients gain the same amount of weight over the course of their...  Need the whole problem figured. Confused on figuring the problem. 2. Manually calculating the t-statistic Aa Aa a An obstetrician wonders whether his patients gain the same amount of weight over the course of their pregnancies as
pregnant women in the United States did 10 years ago. He collects the following random sample of current patient
weight gains: Patient Weight Gains (Pounds)
X 35
31
39 31
34
33
23
23
28
24 The obstetrician plans to use a t-statistic to make an inference about the population mean. Which of the following
conditions are necessary for the t-statistic to be appropriate? Check all that apply. I:| The data are nominal or ordinal. I:I The research question concerns the population variance.
I:I The research question concerns the population mean.
|:| The data are interval. Assume that the distribution of patient weight gains is normal. The obstetrician's null and alternative hypotheses are
H0: u = 33; H1: [1 :t 33. To calculated the t-statistic, the obstetrician first needs to calculate the sample mean ()7)
and the sample standard deviation (5). The value of )_( is , and the value of s is . The value of
the t-statistic is t Distribution V Degrees of Freedom = 10 IEE Use the Distributions tool to determine the rejection region when the significance level is o: = .01. The obstetrician
should reject the null hypothesis when . Thus, the obstetrician reject the
null hypothesis.

#### Top Answer

a. The research question concerns the population mean The data are... View the full answer

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