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An auditor examined data flow diagrams in a small portion of system development projects and determined that there were nearly 12% of them with errors. The Vice-President for Development wants a better estimate of the percentage so you are tasked to sample the diagrams produced for the past five years and report back.
a) How large a sample would you have to examine to be 95% certain that your estimate would be within 3% of the actual percentage? Explain how you arrived at your answer.
b) Given your answer to part a), how will you arrive at the estimate that you will report back to the vice-president?
Suppose you want to find the approximate probability that a randomly selected family form Los ANGELES eans more than $75,000 a year? How would you find this probability? Explain
How many commuters must be randomly selected to estimate the mean driving time of Chicago commuters? We want 98% confidence that the sample mean is within 2 minutes of the population mean.
What is meant by the ordinary least-squares (OLS) method of estimating the ‘‘best'' straight line that fits the sample of XY observations and why do we take vertical deviations?
1. Finch Beak Data. Explain why the finch beak study is considered an observational study. 2. For comparing two population means when the population distributions have the same standard deviation, the standard deviation is sometimes referred to as ..
You are trying to determine the statistical significance of an equation. Given the following information, test the slope of the equation at the 95% level of confidence.
the computer-science aptitude score x and the achievement score y measured by a comprehensive final were measured for
Subsequent questions concern other political, social, and election issues. Explain why this question order might be the best order for estimating how people may vote in the presidential election.
testing equality of two means.an independent testing agency has been contracted to determine whether there is any
A confidence interval estimate for the population mean is given to be (41.16, 49.85). If the standard deviation is 16.290 and the sample size is 54, answer each of the following (show all work):
One flight daily to a certain destination. The following information shows the probability distribution of late arrivals for that flight in the past month:
A "pressure cooker" is a device that allows food to be cooked at pressures that are higher than atmospheric pressure. Explain why this device changes how your food is cooked.
70% of all americans can do routine computations. If an employer were to hire 8 randomly selected americans, determine the probability distribution.
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