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A survey of 30 adults found that the mean age of a person's primary vehicle is 5.6 years. Assuming the standard deviation of the populaiton is 0.8 year, find the 99% confidence interval estimate for the population mean.
The response of the GSS question in 2006 about the number of hours daily spent watching TV, the responses by the seven subjects who identified themselves as Hindus were 2,3,2,1,0,1,4,3. find a point estimate of the population mean for Hindus. The ..
If Procter & gamble sells about 20 million bars of soap per week, but the demand is not constant, and production management would like to get a better handle on how sales are distributed over the year. What might be helpful to the production and (..
Assume each lifetime is independent. Round your answer to four decimal places (e.g. 98.7654). What is the probability that the lathe will operate at least seven years?
A study investigated the perception of corporate ethical values among individuals specializing in marketing. Using a=.05 and the following data (higher scores indicates higher ethical values) test for significant differences in perception among th..
For each of the following problems, assume that the homogeneity of variance assumption has not been met and that you will need to use the adjusted Welch statistic.
Powerball is a lottery game. It involves choosing five white balls from a drum containing 55 balls and one red ball from a drum containing 42 balls. A player must match all five white balls and the red ball to win the jackpot.
An Auditor of a small bsuiness has sampled 50 of 700 accounts. The sample mean total receivables is $435, and the sample standard deviation is $86. Find a 95% confidence interval for the total amount of receivables.
A population is normally distributed, with a mean of 23.45 and a standard deviation of 3.8. What is the probability of each of the following?
Cash withdrawals (in multiples of $20) at an on-campus ATM for a random sample of 30 Fridays and 30 Mondays are shown below.
A new restaurant with 123 seats is being planned. Studies show that 57% of the customers demand a smoke free area. How many seats sould be in the non-smoking area in order to be very sure (mean+3StandardDeviation) of having enough seating there?
A recent study by a large retailer designed to determine whether there was a relationship between the importance a store manager placed on advertising and the size of the store revealed the following sample information:
With a=.05 and a sample of n=15 in a repeated-measures study comparing two treatments, what are the t statistic boundaries for the two-tailed critical region?
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