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The heights of the members of a certain population have a mean of 71 inches. If the heights are normally distributed and 31% of the population are shorter than 66 inches, what is the probability a randomly selected member of this population is between 66 and 76 inches tall?
The personnel manager at a company wants to investigate job satisfaction among the female employees. One evening after a meeting, she talks to all 30 female employees who attended the meeting.
Find a 99% confidence interval for the mean pH in rainfall and interpret the interval and what assumption must be made for the confidence interval to be valid?
A survey conducted by the American Automobile Association of 64 families of size four vacationing in Niagra Falls resulted in an average amount spent per day of $252.45. Assume the population standard deviation of amounts spent per day is estimate..
A flour manufacturer packs flour into paper bags, each of which is supposed to hold 10 pounds, or 160 ounces. Some customers have complained that the bags hold only 9.5 pounds, or 152 ounces.
Conversely with the ball from the second urn. Let Xn denote the state of the system after the nth step. Calculate its transition probability matrix.
Assume that the weights of coconuts are normally distributed with a mean weight of 17.6 pounds and a standard deviation of 1.2 pounds.
How would you find the normal approximation to the binomial probability P(x = 5) in part A? Please show how you would calculate µ and σ in the formula for the normal approximation to the binomial, and show the final formula you would use without g..
The company can either settle out of court for $250,000 or go to court. If the company goes to court and loses, it must pay $825,000 plus $175,000 in court costs. If it wins in court the plaintiffs pay the court costs. Identify the states of natur..
Describe the distribution of the x-bars that you see in part b (shape of distribution, center, and the amount of dispersion).
Using α = .05 test for significance differences among the population mean wasted time for theses three urban areas. What is the p-value? What is your conclusion?
Over a period of years, toothpaste has received a mean rating of 5.9, on a 7-point scale, for overall customer satisfaction with the product.
Why are you no longer directly comparing sample means? How does using the F test - the analysis of variance (ANOVA) reduce your Type I error rate? What is the difference between a within-groups and a between-groups variance?
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