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Jeff's bowling scores are approximately normally distributed with mean 160 and standard deviation 13, while Jack's scores are normally distributed with mean 145 and standard deviation 22. If Jeff and Jack each bowl one game, then assuming that their scores are independent random variables, approximate the probability that the total of their scores is above 285.
Utilizing your charts stated whether the filling operation has been in control for every of the 18 operating hours this day.
Scrap rates per thousand (parts whose defects cannot be reworked) are compared for 5 randomly selected days at three plants. Does the data prove a significant difference in mean scrap rates?
in a study of 750 randomly selected medical malpractice suits it is found that 452 of them were dropped or dismissed.1.
Compute the standard error of estimate, and interpret its meaning.
Use the chi-square test of independence with a .05 level of significance to analyze the data. What is your conclusion?
We want to estimate the population mean within 5, with a 99% confidence level. The population std dev is estimated to be 15. How large is the required sample size?
a researcher is trying to determine the temperature of lake erie within 1 mile of the shore. he measures the
Consider Obama's health care plan. There are = #s of males and females. 50% of the females approve (A) of the plan and 70% of the males do not approve (N) of the plan.
cdrw prime ltd manufactures and replicates cd-roms for software and music recording companies. cdrw prime ltd sells
Standard deviation of 23.8 days. What is the 90% confidence interval for the average days worked by employees in all payroll departments?
Also, the sample data appear to have a bell-shaped distribution. Construct the 95% confidence interval for the mean time spent on paperwork by all managers.
Say you think your positive pairs trade returns are due to pairs trades you made on small stocks (measured by market capitalization). Describe how would you test this hypothesis?
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