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-Suppose that a sample of size 79 is drawn from a population with mean 89 and standard deviation 83 . Find the value of , the mean of the distribution of sample means.
-Suppose that a sample of size 58 is drawn from a population with mean 44 and standard deviation 78 . Find the value of , the standard deviation of the distribution of sample means.
-Suppose that the weight of male babies less than 2 months old is normally distributed with mean 11.5 pounds and standard deviation 2.7 pounds. A sample of 36 babies is selected. What is the probability that the average weight of the sample is less than 11.44 pounds? -The mean monthly rent for a one-bedroom apartment without a doorman in Manhattan is $ 2,648 . Assume the standard deviation is $500. A real estate firm samples 100 apartments. What is the probability that the average rent of the sample is more than $ 2,677 ?
-A survey among freshmen at a certain university revealed that the number of hours spent studying the week before final exams was normally distributed with mean 25 and standard deviation 15. A sample of 36 students was selected. What is the probability that the average time spent studying for the sample was between 28.5 and 30 hours studying?
-Electricity bills in a certain city have mean $ 104.15 . Assume the bills are normally distributed with standard deviation $ 12.67 . A sample of 56 bills was selected for an audit. Find the 42 percentile for the sample mean.
Music and memory Does listening to music while studying hinder students' learning? Two AP® Statistics students designed an experiment to find out.
a what are the control limits for x-bar control charts with alpha 0.002 probability limit and sample size of 4?b
Formulate both a numerical and verbal hypothesis statement regarding your research issue. Perform the five-step hypothesis test on data pertaining to your selection.
What is the Cournot equilibrium outcome for this duopoly? What are equilibrium prices, quantities, and profits for each gas station?
a class containing 15 students 5 of them are females. in how many ways can we select a group of 4 male
Determine the probability that another random sample would lead to a sample proportion as low as or lower than the one obtained by the analyst, assuming the proportion of all mutual funds that outperformed the market is indeed 0.58.
If you require a rate of return of 18.8%, what is the highest price you should be willing to pay for this share?
The GMAT scores from a sample of 50 applicants to an MBA program indicate that none of the applicants scored below 450. A frequency distribution was formed by choosing class intervals 450 to 499, 500 to 549, and so on, with the last class having a..
Establish a 99% Confidence interval about the difference in the proportion of the town voters and county voters who favor the proposal.
Find the average caller "on hold" time if the company maintains that no more than 9% of callers wait more than 6.6 minutes.
A communications professor at a university believes this percentage is higher among community college students. She selects 362 community college students
Determine the following areas under standard Normal distribution curve.
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