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A survey conducted by the American Automobile Association showed that a family of four spends an average of $215.60 per day while on vacation. Suppose a sample of 64 families of four vacationing at Niagara Falls resulted in a sample mean of $252.45 per day and a sample standard deviation of $74.50.
a. Develop a 95% confidence interval estimate of the mean amount spent per day by a family of four visiting Niagara Falls (to 2 decimals).
Write a short paragraph explaining to the psychologist what can be concluded from this output (assuming the technical conditions are met).
A manufacturer claims that the mean lifetime of its light bulbs is 55 months. The standard deviation of these lifetimes is 6 months. Twenty-two bulbs are selected at random, and their mean lifetime is found to be 56 months.
an index of two store items for 2007 based on 2004 is to be constructed. the information for the prices and quantities
A normal distribution with a mean time of 2:00pm and a standard deviation of 15 minutes. What is the probability that the mail will arrive later than 2:30pm?
A machine has three components working independently. The probability that Component A fails is 0.1, the probability that component B fails is 0.2, and the probability that component C fails is 0.3.
questionthe following data represents the car tyres life time in days for three different companies in indiacompany
the owner of a grocery store finds that she sell 980 gallons of milk each week at 2.69 per gallon and 1220 gallons of
What are the estimated monthly sales for a particular region with a population of 796,000, per capita income of $6,940, and an unemployment rate of 6.0 percent?
according to a genetics theory a certain cross of guinea pigs will result in red black and white offspring in the ratio
The customer measured the tension of each and calculated the summary statistics. In order to conduct the test, the customer selected a significance level of Interpret this value.
Determine the sample size needed in order to be 99% confident that the sample proportion of the current customer accounts is within .03 of the true proportion of all current accounts for this company.
If researchers want to take a new sample of size 55, what will be the standard deviation of the distribution of the sample mean?
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