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1. A research concludes that the number of hours of exercise per week for adults is normally distributed w ith a mean of 4 hours and a standard deviation of 2 . 5 hours. Show all work. Just the answer, without supporting work, will receive no credit.
(a) What is the probability that a randomly selected adult has at least 5 hours of exercise per week (round the answer to 4 decimal places)
(b) Find the 75 th percentile for the distribution of exercise time per wee k . ( round the answer to 2 decimal places)
2. Assume the SAT Mathematics Level 2 test scores are normally distributed with a mean of 500 and a standard deviation of 100. Show all work. Just the answer, without supporting work, will receive no cred it.
(a) Consider all random samples of 6 4 test score s. What is the standard deviation of the sample means ? (Round your answer to three decimal places)
(b) What is the probability that 6 4 randomly selected test scores will have a mean test score that is between 4 90 and 5 20 ? (Round your answer to four decimal places)
If they have a GPA that falls in the range between 2.50 and 3.50, what is their z score and percentage of the area do they fall in?
Assume that this sample mean was obtained from a random sample of 200 homes in this county, and that the sample standard deviation was $140,000. Give a 95% confidence interval for the average value of a home in Ventura County.
Assuming a normal distribution of item values, what percentage of values would you expect to be out of bounds when the process is in control?
Drug use forty-six percent of marijuana use among youth occurs in the inner cities (Source: Partnership for a Drugfree America).
consider the following frequency of demanddemandnbspnbspnbspnbspnbspnbsp relative
What type of survey method the researcher could use and why and what sampling method could the researcher use to select his/her sample and why
In a random hour, the number of call attempts N at a telephone switch has a Poisson distribution with a mean of either α0 (hypothesis H0) or α1 (hypothesis H1). For a priori probabilities P[Hi], find the MAP and ML hypothesis testing rules given ..
During our examination of the foundations of western culture, we have wrestled with the questions, "What is a good human being? What is the good life?
Assume that a 95% confidence interval estimate of the population mean annual starting salary is desired. what is the planning value for the population standard deviation?
question recently students in a marketing research class were interested in the driving behavior of students.
Suppose that the natural logarithm of cholesterol levels for males in a given age bracket is normally distributed with amean of 5.35 and a standard deviation of .12. What percentage of themales in this age bracket could be expected to have a seru..
For a regional hospital in a metropolitan area, what are some of the internal failure and external failure costs? How might they be reduced?
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