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A sample of 100 widgets from the Acme production line shows that the average lifespan of these parts is 900 hours. The standard deviation of production has been 200 hours historically and is known to be normally distributed.
a) Give a point estimate of lifespan of all production.
b) Form an interval estimate for the students using a 99% confidence interval
c) Interpret the results you obtained in question }p
d) Assuming the sigma of 200 was actually the standard deviation for the sample, recalculate the interval estimate. Discuss how this changed your result from that in part b.
For a two-tailed test of hypothesis (.01 significance level) to determine if there is a difference in the population means, the degrees of freedom are
The number of degrees of freedom for the appropriate chi-square distribution in a test of independence is:
A manufacturer of 35-mm cameras knows that a shipment of 30 cameras sent to the large discount store contains 8 defective cameras. The manufacturer also knows that the store will choose two of the cameras at a random, test them, and accept the shi..
Is it reasonable for the manufacturer to claim that the drill bits will last 2.5 hours?
A month is classified as "extremely wet" if the amount of rainfall is in the upper 10% for that month. How much precipitation must fall before a month of April is classified as "extremely wet".
Make your calculation supposing a two-sided two-sample t-test with a type I error (alpha) of 0.056
As part of this trial, they want to find out whether there is a difference between effectiveness for women and for men. At = .05, what is the test value?
Research question: Are mean crash damages same for these 3 vehicles? Crash1 Crash Damage ($).
Illustrate what is the probability all four calls are infact emergencies. Illustrate what is the probability that three or more calls are not emergencies.
Use MegaStat's output for multiple regression to determine the multiple regression equation
For the samples summarized below, test the hypothesis at ∞ =.05 that the two variances are equal. Variance Number of data values Sample 1 19 8 Sample 2 9 18
Suppose the probability of a boy being born is the same as the probability of a girl being born. Find the probability that a family with three children will have two boys and one girl.
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