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Problem: The masses (in kilograms) of a sample of five boxes being sent by Purolator are: 13, 6, 7, 4 and 10.
a) Compute the range
b) Compute the standard deviation
c) Using Chebyshev's Theorem, at least what percent of the observations must be within 2.5 standard deviations of the mean?
d) Given the masses are normal, about 68% of the values would occur between what values?
e) Determine the first quartile
q1. an investigator hypothesizes that cholesterol level in children might be affected by educating their
What must be the probability that a randomly chosen young adult has some education beyond high school but does not have a bachelor's degree? What is the probability that a randomly chosen young adult has at least a high school education?
If you are constructing a confidence interval for a population mean, for the same confidence level, the width of the confidence interval will
A spring has a nonlinear force law such that the force necessary to compress the spring is given by: What is the chance that 1 item out of 30 would remain as 1 of the last 2 items if an item is removed 1 at a time?
Use the Wilcoxon signed-rank test with a = 0.01 to determine whether there is any evidence that the median APR on student credit cards is less then 15.06.
a major airline recently began encouraging reservation agents to nap during their breaks. the table below lists the
A cohort study of smoking and bladder cancer was conducted in a small island population. There were a total of 1000 people on the island. Four hundred were smokers and 600 were not. Fifty of the smokers developed bladder cancer. Ten of the non-smo..
Find the probability that the number that say they would feel secure is (a) exactly five, (b) more than five, and (c) at most five.
Produce a 95% confidence interval to estimate the change of the average selling price of gasoline between the twentieth and the twenty-first centuries.
Why did people in other countries believe that the American Revolution or the Declaration of Independence was important to them?
A social psychologist studied the effect of height on perceived overall attractiveness. Students were recruited to come to a research laboratory in pairs.
On time. A Department of Transportation report about air travel found that, nationwide, 76% of all flights are on time.
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