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Assume that we want to estimate the mean IQ score for the population of statistics professors. How many statistics professors must be randomly selected for IQ tests if we want 99% confidence that t
Cletus Inc. plans to overhaul the cafeteria menu and has formed a four person team to evaluate alternatives. The team identifies four criteria and their corresponding percentage weights. Option A ha
A product is made up of 20 componets in a series. Ten of the componets have a 1/10,000 chance of failure. Five have a 3/10,000 chance for failure. Four have a 4/10,000 chance for failure. One compo
It has been determined from past golfing data that the number of hours a couple spend playing golf per day is normally distributed with a mean of 5 and a standard deviation of 2. Use an appropriate
A random sample of 100 items is selected from a population of size 350. What is the probability that the sample mean will exceed 200 if the population means is 195 and the population standard devia
Last year in the 400 random tests conducted, 14 employees failed the test. Would it be reasonable to conclude that less than 5 percent of the employees are not able to pass the random drug test?
A recent survey of 50 executives who were laid off from their previous position revealed it took a mean of 26 weeks for them to find another position. The standard deviation of the sample was 6.2 we
Determine a 95 percent confidence interval for the population mean. Need procedures in excel spreedsheet
An auditor wants to estimate what proportion of a bank's commercial loan files are incomplete. The auditor randomly samples 100 files and finds 9 are incomplete. Using a 95% confidence interval, est
Suppose an archeologist wants to estimate the density of ferromagnetic artifacts in the Tara region. For this purpose, a random sample of 55 plots, each of size 100 square meters, is used. The numbe
What is the variance on this questionnaire in the general population?
You're the supervisor of a group of employees whose task is to assemble disk drives that go into computers. You find that quality is not what it should be and that many of your group's devices have
What can be said about the sampling distribution for the average amount of time customers spent in the restaurant? Be sure to explain your answer.
A study is run to estimate the mean total cholesterol level in children 2 to 6 years of age. A sample of 9 participants is selected and their total cholesterol levels are measured as follows:Generat
Among coffee drinkers, men drink a mean of 3.2 cups per day with standard deviation of 0.8 cups. Assume the number of coffee drinks per day follows a normal distribution.
What proportion of children 10 to 15 years of age would be classified as hyperlipidemic (assume that hyperlipidemia is defined as a total cholesterol level over 200)?
A nursing school wants to estimate the true mean annual income of its alumni. It randomly samples 200 of its alumni. The mean annual income was $52,500 with a standard deviation of $1,800. Find a 9
A private medical clinic wants to estimate the true mean annual income of its patients. The clinic needs to be within $100 of the true mean. The clinic estimates that the true population standard d
According to a survey 78 % of major US companies electronically monitor their employees. What is the probability that at most 196 companies in the sample electronically monitor their employees?
What is the approximate probability that the mean score X of these students is 23 or higher? D) Which of your two normal probability calculations in (a) and (c) is more accurate? Why?
Using the data, construct a 95% lower confidence interval on mean battery life. Why would the manufacturer be interested in a one-sided confidence interval?
The Normal distribution with mean 130 gallons and standard deviation 12 gallons. On a randomly selected day, the probability that the store sells at least 154 gallons is?
Make a worksheet in Excel for your calculations. (b) Make a histogram of the data. Would you be justified in using a parametric t test that assumes normality?
Five percent of bottles filled by A, four percent of bottles filled by B, and three percent of bottles filled by C are rejected for some reason. If a bottle is filled by A or B, what is the probabil
20% of their customers purchase package 3 and 25% of their customers purchase package 4. Find the expected value or average profit per customer.