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Suppose as part of a national study of economic competitiveness a marketing research firm randomly sampled 200 adults between the ages of 27 and 35 living in metropolitan Seattle and 180 adults between the ages of 27 and 35 living in metropolitan Minneapolis. Each adult selected in the sample was asked, among other things, whether they had a college degree. From the Seattle sample 66 adults answered yes and from the Minneapolis sample 63 adults answered yes when asked if they had a college degree. Based on the sample data, can we conclude that there is a difference between the population proportions of adults between the ages of 27 and 35 in the two cities with college degrees? Use a level of significance of 0.01 to conduct the appropriate hypothesis test.
Determine the range, variance, and standard deviation for sample data and find the minimum number of visits required receive a gift.
The probability that a business owner will go bankrupt in it first year is .34. For 25 like businesses, find the probability first by using the binomial probability formula, and then by using the normal approximation.
Independent random samples of 12 users of the other system rate their system on the same scale. Based on these data, are the two telecommunication system equally liked? Explain.
a pair of dice is rolled 10 times. what is the probability that a sum of seven is observed at most three
Suppose that 47 showed reduced allergic reactions and 17 showed an increase in allergic reactions. Are these results sufficient to conclude that the self hypothesis has a significant effect.
A student randomly guesses on all 25 questions of a true-false test. Use the normal approximation to the binomial to approximate Pr[ ], that is, that the student gets 10 or fewer questions correct.
If the production process is in control, the mean number of chips per cookie is 6.0 What is the probability that in any particular cookie being inspected. What is probability that in any partcular cookie being inspected, there are less than 4 choco..
Suppose the manufacturers claim is right, determine the probability the mean of sample is 47,840 miles or less?
Define the decision rule. Calculate the value of the test statistic.
Suppose that this estimate was based on a random sample of 600 households (i.e., n = 600 and p = .64). Construct a 95% confidence interval for π, the true proportion of all households that use coupons.
Consider the following data for two independent random samples taken from two normal populations. What is the 90% confidence interval estimate of the difference between the two population means?
The mean construction time for a standard two-car garage by Arrowhead Construction Company is 3.5 days. The time for the construction process follows the normal distribution.
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