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An engineer is studying bearing failures for two different materials in aircraft gas turbine engines. The following data are failure times (in millions of cycles) for samples of the two material types.
Assume salaries are normally distributed with a standard deviation of $4,500. What is the probability of a new graduate receiving a salary between $45,000.
estimate the critical value of t for a 99 confidence interval with degrees of freedom df equal to
Develop a linear regression model for these data and forecast the occupancy rate for next year if the Blue Sox win 88 games.
Do creative people make better salespeople? Ten sales staff in a large company were given a creativity test (scores range from 0 to 20
She wants to be 95% confident that her estimate is correct. If the standard deviation is $1050, how large a sample is needed to be accurate within $200?
The Secretary of Welfare hypothesizes that the average district office has 5% or fewer fraudulent or ineligible recipients. A sample of 10 offices reveals a mean of 4.7% with a standard deviation of 1.2%. What can be said about the secretarys hypo..
Given the following situation, how would you use Megastat to test whether the population defective rate is greater than 5%? Please outline the process for the test and, if necessary, including the output from Megastat to explain your approach.
Suggesting that the combined sample evidence tends to refute the hypothesis that the coin is fair. Explain this apparent discrepancy.
What is the probability that exactly 9 of the children are cured? Report your answer to four decimal places, rounding in the usual way?
how do you find the pooled standard deviation in an anova table?a. it is the mse.b. it is the msg.c. it is the square
using two independent samples we test for a hypothesized difference between two population means. the population
question on february 8 2002 the gallup organization released the results of a poll concerning american attitudes
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