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In an examination of holiday spending (known to be normally distributed) of a sample of 16 holiday shoppers at a local mall, an average of $54 was spent per hour of shopping. Based on the current sample, the standard deviation is equal to $21. Find a 90% confidence interval for the population mean level of spending per hour.
in testing the difference between the means of two normally distributed populations using large independent random
Assuming the standard deviation stays the same, how much do you have to reduce your average production time so that 95% of the time you can deliver the product in under 75 hours?
some types of periodicals are often browsed on the shelves but seldom purchased. a popular home improvement magazine
question 1 assume that breast cancer affects .8 percent of the female population between 40 and 50 years of age. there
Their probabilities for success on a single play are p for A and q for B, and successive plays are independent. Determine the probablity that A wins the contest given A plays first.
the alphacor company experiences some type of failure on its computer network on average once every 4 hours. assume
What proportion of children 10 to 15 would be classified as hyperlipidemic (assume that hyperlipidemia is defined as a total cholesterol lelvel of 200)?
A random sample of size 10 is selected from the N (20, 5) distribution. What is the probability that the variance of this sample exceeds 10?
They have collected data on gender, shoe size, and height to see if they can change their business model to include only one size of shoes regardless height or gender of the wearer.
Let μ be the hourly wage (excluding tips) for workers who provide hotel room service in a large city. A random sample of a number (more than 30) of such workers yielded a 95% confidence interval for μ of $8.46 to $9.86 using the normal distributio..
thirty percent of the people called agree to participate in a brief telephone survey. in a random sample of four people
nurses wondered if birth weights of babies are going up. they knew what the average birth weight of a baby last year
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