## A medical researcher studied obesity in adolescent girls. The researcher collected body mass index (BMI), body fat percentage, and other per

Question

A medical researcher studied obesity in adolescent girls. The researcher collected body mass index (BMI), body fat percentage, and other personal variables from 92 adolescent girls. The data collected by the researcher is a random sample representative of the population of all adolescent girls. We do not know the population standard deviation for adolescent girls’ BMI.
Selected data from the sample is provided below:
Sample Statistic Value of sample statistic
Sample mean (x^-) Body Mass Index (BMI) 21.65
Sample standard deviation (s) of Body Mass Index (BMI) 4.33
Sample size 92
1) You will use information about the body mass index (BMI) variable for the sample of adolescent girls to compute and interpret confidence intervals.
a) Based on the given information, compute a 90% confidence interval for the population mean BMI of adolescent girls. Note that if the sample size is sufficiently large, you can use a z* confidence multiplier instead of a t’ confidence multiplier. Round any values that you use to three decimal places.
b) In your 90% confidence interval, what is the point estimate for the population mean BMI of adolescent girls? Provide a numeric value.
c) In your 90% confidence interval, what is the margin of error? Provide a numeric value.
d) Interpret your 90% confidence interval for the population mean BMI of adolescent girls.

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9 hours 2021-09-12T16:24:28+00:00 1 Answer 0

## Answers ( )

1. interpret your 90% confendencw