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At a large publishing company, the mean age of proofreaders is 36.2 years, and the standard deviation is 3.7 years. Assume the variable is normally distributed. Please put you answer in decimal form. b. If a random sample of 15 proofreaders is selected, find the probability that the mean age of the proofreaders in the sample will be between 36 and 37.5 years
a control chart for the fraction non-conforming of muffler bearing production is maintained with a p value of 0.10 and
Find a 90 percent confidence interval estimate of the population mean and what is the 95 percent confidence interval estimate of the population mean.
The flashlight batteries produced by Manufacturer X are known to have a mean life of 60 hours, with a standard deviation of 4 hours. At least what percentage of flashlights will have a life of 54 to 66 hours?
now that you are familiar with the basic concepts of statistics what are some examples of when you have seen or heard
a search engine site claims that on average one out of five visitors clicks on an ad.a if 8 users visit the site what
a real estate company wants to study the relationship between house sales prices and some important predictors of sales
If you know you need a sample size of 1,063 out of 300,000 to get a 95% confidence level and a 3% confidence interval what steps would you take to get a random sample?
Statistics Questions Set: If the mean number of hours of television watched by teenagers per week is 12 with a standard deviation of 2 hours, what proportion of teenagers watch 16 to 18 hours of TV a week? (Assume a normal distribution.)
Using the original data, test at the 5% significance level that the population standard deviation of studying times is greater than 4 hours.
in a survey of 270 college students it is found that 64 like brussels sprouts 94 like broccoli 58 like cauliflower 26
Estimate with 95% confidence the mean reduction in time it takes for someone who has taken the sleeping pill to fall asleep.
assume that womens heights are normally distributed with a mean given by u62.3in and a standard deviation given by
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