A researcher collected sample data for 18 middle-aged women. The sample had a mean serum cholesterol level (measured in milligrams per one nundred milliliters) of 192.2 , with a standard deviation of 7.7 . Assuming that serum cholesterol levels for middle-aged women are normally distributed, find a \( 95 \% \) confidence interval for the mean serum cholesterol level of all women in this age group. Give the lower limit and upper limit of the \( 95 \% \) confidence interval. Carry your intermediate computations to at least three decimal places. Round your answers to one decimal place. (If necessary, consult a list of formulas.) Lower limit: Upper limit:

Find the range of the following data set, Assume the data set is a sample. \[ \begin{array}{lllllllllll} & 41 & 82 & 37 & 43 & 77 & 44 & 44 & 50 & 49 & 49\end{array} \] 8

If a scatter plot shows points that are closely clustered together, what can you infer about the correlation between the variables?

Four scenarios of statistical studies are given below. Decide which study uses a population parameter. Answer 1000 of the 1883 participants in last year's Ironman in Kona, Hawail were interviewed. \( 68 \% \) of those interviewed said they became interested in triathlons after first ofmpeting in marathons. 351 dog owners who were surveyed, 70 reported owning two dogs. Parkland Hospital performs 15,000 births a year. Of 1000 subjects in a study on multiple births, 38 gave birth to twins. in \( 2001.78 \% \) of children diagnosed with cancer were in remission after five years, and this number is improving.

The grades on the second statistics test for Ms. Rose's class are in the following list. Find the frequency distribution for the grades. B, B, A, D, D, D, D, C, C, D, F, D, D, D, D, B, C, B, F, F, C

In how many ways can a committee of 5 students be formed from 10 students?