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A hypothesis test is to be performed to determine whether the mean waiting time during peak hours for customers in a grocery store has changed from the previous waiting time of 8.3 minutes. Preliminary data analyses indicate that it is reasonable to apply a z-test, with population standard deviation 3.6 minutes. The sample size is 45. The significance level is 0.05. Find the probability of a Type II error if in fact the mean waiting time is actually 9.8 minutes.
Provide a discussion that supports the assumption that the variance of savings increases with family income.
Construct a 90% confidence interval for the population proportion p . Does your result agree with your conclusion in part (a)?
Recognize the kind of sampling (random, systematic, convenience, stratified, cluster) employed whenever a sample of people who smoke is obtained as explained below.
Compute the mean of the sampling distribution? Compute the standard deviation of sampling distribution?
What is the P-value of the test, assume the standard deviation is 3 years, a 95% confidence interval for the average time
How many ways can she choose 4 dissimilar rides if order does not matter? If she has chosen the first weeks rides, how many ways can she choose four more different rides for second week? Suppose that order does not matter.
The CEO of the business has nothing better to do wheras measured the temperatures of 26 department managers 1 to 4 times every day to get a total of 123 measurements.
Appalachian Coal mining believes it can enhance labor productivity and therefore net revenue by reducing air pollution in its mines. It estimates that the marginal cost function for reducing pollution by installing additional capital equipment is.
Use frequency distribution to create a probability distribution, determine the (b) mean,(c) variance.
Projection are form the U.S. National Center for Education Statistics>. Create a multiple bar graph of data, and then explain any trends.
Assume the arrival of these emails i3 approximated by the Poisson distribution.
Conduct the hypothesis test and compute the p-value. At a 0.05 level of significance, what is your conclusion?
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