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1. Suppose the distribution of cholesterol level in normal adults is roughly symmetric with mean 219 mg/100mL and standard deviation 41 mg/100mL. A large number of physicians join a study. Each of them selects a random sample of size 25 from their regular visitors and measures their cholesterol level.
a. What is the expected value of the sample means?
b. What is the standard error of the sample means?
c. What proportion of the sample means do you expect to be greater than 223 mg/100mL?
d. If each physician increases the sample size from 25 to 50, what proportion of the sample means do you expect to be less than 218 mg/100mL?
e. One physician observes the following data on 25 individuals. She does not know the population mean or population variance of cholesterol levels. What is her estimate of the population mean and a 95% confidence interval?
213 196 267 194 249 275 277 165 164 239
190 234 161 214 215 239 225 232 160 261
170 308 160 201 203
Berdine's Chicken Factory has several stores in the Hilton Head, South Carolina, area. When interviewing applicants for server positions, the owner would like to include information on the amount of tip a server can expect to earn per check (or bi..
The article "Effects of a Rice-Rich Versus Potato-Rich Diet on Glucose, Lipoprotein, and Cholesterol Metabolism in Noninsulin-Dependent Diabetics" (Amer. J. of Clinical Nutr., 1984: 598-606) gives the accompanying data on cholesterol-synthesis rat..
If the theater has 100 seats, find the probability that 6 or more patrons will not show up for the sold-out performance.
Reconsider the data on claw closing force and claw size for three species of crabs, shown in Exercise 7.22. Display 10.18 shows output from the least squares fit to the separate lines model for the regression of log force on log height.
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First, read Chapter 6 and Case 3: Miller Building Supplies in your textbook, Working Capital Management: Applications and Case Studies
a. Construct a bar chart that effectively displays these data. b. Construct a pie chart to display these data.
How much money would a Western household have to spend on groceries per year in order to be at the 99th percentile (i.e., only 1% of Western households would spend more on groceries)?
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There are so many issues to think about, however, that he has a difficult time keep ing them all straight. After hearing about your decision-analysis course, he asks you whether you have learned anything that might help him in his decision. What k..
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