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Refer to the smooth curve in given Figure, illustrating the sampling distribution of mean hours of sleep for a sample of 190 college students, taken from a population of sleep hours with a mean of 7.1 hours and standard deviation of 2 hours. Explain whether each of the following would be likely if you were to take a sample of 190 students from the original population.
a. The mean hours of sleep for the 190 students would be between 8 and 9 hours.
b. The mean hours of sleep for the 190 students would be between 7 and 8 hours.
c. The number of hours of sleep reported by the first student in the sample would be between 8 and 9 hours.
d. The maximum number of hours of sleep reported by any student in the sample would be less than 8 hours.
Develop a model for determining how many people should be sent to contain the fire and for determining the best location for the firebreak.
What percentage of all samples of size 61 will have a mean value between 454 and 482? Give your answer correct to one decimal place.
When we move from the basic normal distribution to the sampling distribution of the mean we substitute the standard error of the mean for the standard deviation when we make the conversion to the standardized normal distribution.
test the claim that the proportion of men who own cats is smaller than the proportion of women who own cats at the .10
From the sample, estimate the true mean Mach rating score of all purchasing managers.- Form a 95% confidence interval for the estimate, part b.
use table to find each critical values1. z for the 94 confidence interval?2. z for the 78 confidence interval?3. t and
Estimating a linear regression equation to predict the future values of the dependent variable Y.
Suppose that, on average, in every two pages of a book there is one typographical error, and that the number of typographical errors on a single page of the book is a Poisson r.v. with λ = 1/2. What is the probability of at least one error on a ce..
At the 0.10 significance level, can we conclude that the annual rates of return are higher on the big board?
How many ways might there be in picking a small group of 6 people from a large group of 20 people?
assume that a procedure yields a binomial distrubition with n trials and the probability of success for one trial is p.
Transmission is normally distributed with an average of 78,000 miles and a standard deviation of 15,000 miles. What percentage of these transmissions will last at least 90,000 miles?
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