The Interstate Conference of Employment Security Agencies says the average workweek in the United States is down to only 35hours, largely because of a rise in part-time workers. Suppose this figure was obtained from a random sample of 20 workers and thatthe standard deviation of the sample was 4.5 hours. Assume hours worked per week are normally distributed in the population. Usethis sample information to develop a 98% confidence interval for the population variance of the number of hours worked per weekfor a worker. What is the point estimate?(Round your answers to 2 decimal places, e.g. 25.31.)The point estimate iss0²sAppendix A Statistical Tables

Population mean: hoursSample size: Sample standard deviation: hoursConfidence level:

Answered: The Interstate Conference of Employment…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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A study of 96 bolts of carpet showed that their average length was 77.5 yards. The standard deviation of the population is 1.6 yards. Which of the following is the 90% confidence interval for the mean length per bolt of carpet?
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In an effort to estimate the mean amount spent per customer for dinner at a major Atlanta restaurant, data were collected from 64 randomly selected customers. The sample mean was calculated as $27.75 with a sample standard deviation of $4. We wish to develop a 91% confidence interval for the mean amount spent per customer for dinner at this restaurant. Assume that the standard deviation of the amounts spent by ALL customers is $4.30. What is the variable of interest? ["", "", ""] And is this variable Quantitative or Qualitative? ["", ""] In other words: what is the one piece of info we care about for each individual in the population? Is it a quantitative measurement? Or do we determine if each individual belongs to a certain category (referred to as success) or not (failure)? If it is a quantitative measurement, then the population is filled with numbers. Otherwise, the population is filled with…
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