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A quality control supervisor has taken a sample of 16 bolts from the output of a thread-cutting machine and tested their tensile strengths. The results, in tons of force required for breakage, are as follows:
2.20 2.15 1.85 2.231.98 2.24 1.96 2.271.95 2.08 1.92 2.192.07 2.31 2.30 1.89
a) Determine the mean, median, range, and midrange.b) Calculate the mean absolute deviation (MAD).c) Calculate the standard deviation and variance
You are the manager of a softball league in the locality in which there are 5 local teams with 10 people each. The league has been arranged for parity so that each local team has 5 good players and 5 bad players.
A sample of 400 bags of dog food which are advertised to contain twenty-five pounds had a mean content weight of 24.5 pounds with a standard deviation of 3 pounds.
Of the estimated natural gas reserves in North America, 4.59 *10^9 m ^3 are in United States. 2.66*10^9 m^3 are in Canada, and 1.99*10^9 m^3 are in Mexico.
The Executive Camera Company provides full expenses for its sales force. When attempting to budget automobile expenses for its employees, the financial department uses mileage figures to estimate gas, tire, and repair expenses.
At the .05 significance level can we conclude that there is more variation in the processing time of the new machine?
A scientist wishes to find the 98% confidence interval for the mean number of peaches per tree. How many trees does she need to sample to be accurate within 10 peaches per tree?
A manufacturer of a chemical used in glue, attempting to control the amount of a hazardous chemical its workers are exposed to, has given instructions to halt production if the mean amount in the air exceeds 3.0 ppm.
Identify the level of measurement (nominal, ordinal, interval, ratio) for the number of shares held by stockholders.
Find the asymptotic distribution of the MLE of the indicated parameter and find formulas for approximate standard errors of the MLE.
A multiple choice test with 50 questions is given. Each question has four choices. What is the student's probability of passing if passing is at least 60% correct?
Make a stem plot for the men height data. Calculate the five-number summary for the women.
What is the probability that the sample proportion of grocery stores selling Haagen-Dazs ice-cream, will be within 0.01 of the population proportion?
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