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Total cholesterol in children ages 10-15 yrs of age is assumed to folow a normal distribution with a mean 191 and a standard deviation of 22.4
A.) What proportion of children 10 to 15 have a total cholesterol between 180 and 190?B.) What proportion of children 10 to 15 would be classified as hyperlipidemic (assume that hyperlipidemia is defined as a total cholesterol lelvel of 200)?C.) What is the 90th percentile of total cholesterol?
A random sample of 100 computers showed a mean of 115 gigabytes used with a standard deviation of 20 gigabytes. What is the standard error of the mean?
At the .01 significance level, can we conclude that there is more variation?
Calculate the correlation between decorating and Christmas enjoyment - Maximize Wayne's studying effectiveness.
Product while 43 out of 80 females preferred it. Compute the test statistic and use technology to find the corresponding p-value based on this test.
Nicotine patches are often used to help smokers quit. Does giving medicine to fight depression also help? A randomized double blind experiment assigned 244 smokers to receive nicotine patches and another 245 to receive both a patch and the antidep..
During the past six months, 73.2% of US households purchased sugar. Assume that these expenditures are approximately normally distributed with a mean of $8.22 and a standard deviation of $1.10. 80% of the households spent more than what amount?
Convert these four officers' scores to standardized z-values.Do you believe there was adequate reason to question these four exam scores? What suppositions are you making?
In a sample of 50 members of a local health club you find that 12 of these members meet weekly with a physical fitness trainer and that the average body mass index (BMI) of these 12 members is less than the average BMI of the other 38 club members..
What does a confidence interval tell us and why is it importance to use a confidence interval?
At the time she was hired as a server at the Grumney Family Restaurant, Beth Brigden was told, "You can average $72 a day in tips." Assume the population of daily tips is normally distributed with a standard deviation of $2.45.
Estimating the value of the population mean on the basis of the sample mean alone produces a(n):
What is the 95% confidence interval for the standard deviation of birth weights at County General Hospital, if the standard deviation of the last 25 babies born there was 1.1 pounds.
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