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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.
Explain what a nonparametric test is, and state one disadvantage of having to use a non-parametric test. Describe a research study where the outcome variable may warrant the use of nonparametric statistics over parametric statistics.
Find the mean number of radioactive atoms lost through decay in a day. Find the probability that on a given day, 50 radioactive atoms decayed.
In an online survey of 4001 respondents, 8% were classified as productivity enhancers who are comfortable with technology and use the internet for its practical value. Suppose you select a sample of 400 students at your school, and the population ..
What is the probability neither truck is available?
Where do you find the elements with the least atomic size, greatest electronegativity, and greatest ionization energy in the periodic table?
Find the critical value X 2/0 and rejection region for the type of chi-square test with sample size n and level of significance α.
finnish furniture manufactures tables in facilities located in three cities-reno denver and pittsburgh. the tables are
Is Drinking Independent of Type of Crime? The accompanying table lists sample data that statistician Karl Pearson used in 1909. Does the type of crime appear to be related to whether the criminal drinks or abstains?
according to the mendelian theory of inherited characteristics a cross fertilization of related species of
how old are college students? the national age distribution for college students is shown below. national age
Now they need your help to determine if the mean number of news shows watched in your neighborhood is similar to the national mean.
Are X and Y independent?
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