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Pilots who cannot maintain regular sleep hours due to their work schedule often suffer from insomnia. A recent study on sleeping patterns of pilots focused on quantifying deviations from regular sleep hours. A random sample of 30 commercial airline pilots was interviewed, and the pilots in the sample reported the time at which they went to sleep on their most recent working day. The study gave the sample mean and standard deviation of the times reported by pilots, with these times measured in hours after midnight. (Thus, if the pilot reported going to sleep at 11 p.m., the measurement was -1.) The sample mean was 0.7 hours, and the standard deviation was 1.9 hours. Assume that the sample is drawn from a normally distributed population. Find a 90% confidence interval for the population standard deviation, that is, the standard deviation of the time (hours after midnight) at which pilots go to sleep on their work days. Then complete the table below.Carry your intermediate computations to at least three decimal places. Round your answers to at least two decimal places.
a group of investors wants to develop a chain of fast-food restaurants. in determining potential costs for each
a. Explain a method of randomizing the experimental units to the levels of factors A and B in this experiment. b. Write a linear model for this experiment. Make sure to identify each of the terms in the model and list the range of values for all su..
Random Sample Obtain (generate) a random sample of 180 numbers between 1 and 60. You may use a calculator, excel, or a table of random numbers to achieve this. Summarize your sample into a frequency distribution with 6 classes.
A manufacturer of billiard balls is testing three additives to the basic plastic. Show the partial ANOVA table
Tompkins Associates reports that the mean clear height for a Class A warehouse in the Unites States is 22 feet. Suppose clear heights are normally distributed and that the standard deviation is 4 feet.
the following table gives classifications on gender and salary of 1000 employees at a company. use this
Estimate the Mean, Median, Range, Standard Deviation and Coefficient of Variation and calculate the 25th, 50th, and 75th percentile of the first year data on advertising costs.
a company is studying the number of monthly absences among its 125 employees. the following probability distribution
a comparison between the average jail time of bank robbers and car thieves yielded the following results in yearsn180
a sample of nine public universities and nine private universities was taken. the total cost for the year including
The Gallup Poll has decided to increase the size of its random sample of Canadian voters from about 1500 people to 4000 people. The effect of this increase is: increase the standard error of the estimate.
A recent census of a small town in Michigan showed that 60% of the residents are male, 20% have college degrees, and 15% are both male and college graduates.
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