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Category > Statistics Posted 26 May 2017 My Price 4.00

A researcher was interested in knowing whether the mean weight of the second baby is higher

A researcher was interested in knowing whether the mean weight of the second baby is higher, lower, or about the same as the mean weight of the first baby for women who have at least two children. She selected a representative sample of 40 women who had at least two children and asked them for the weights of the oldest two at birth. She found that the mean of the differences (first - second) was 5 ounces, with a standard deviation of 7 ounces.

a. Why was the researcher’s study design better than taking independent samples of mothers and asking the first sample about the weight of their first baby and the second sample about the weight of their second baby?

b. Define the parameter of interest. Use appropriate notation.

c. Write the mean of 5 ounces and the standard deviation of 7 ounces using appropriate statistical notation.

d. Find a 90% confidence interval for the parameter that you defined in part (b). Write a sentence or two interpreting the interval.

 

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Alpha Geek
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Status NEW Posted 26 May 2017 05:05 PM My Price 4.00

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file 1495820311-Answer.docx preview (59 words )
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