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A manufacturer of "low precision" 10 mm diameter ball bearings periodically takes samples and measures them to con?rm that the manu- facturing process is still on target. A random sample of 20 ball bearings resulted in diameter measurements with an average of x¯ = 9.86 mm, and a standard deviation s = 1.01 mm. Postulating that the random sample X1 , X2 ,..., X20 is from a Gaussian distribution with μ = 10, ?nd the probability that any sample mean, X¯ , will fall to either side of the postulated mean by the observed amount or more, by chance alone. i.e. P (X¯ ≤ 9.86) or P (X¯ ≥ 10.14).
Find at least what % of the weights are within xbar ± 3.5s - pounds of a sample of high school football players.
the e-mail usage for two different plants of a large company was compared at level of significance 0.05. a sample of
discuss reliability and validity in qualitative
For the binomial sample information summarized below, indicate whether the sample size is large enough to use the large sample approximation to construct a confidence interval for p.
a hat contains n coins f of which are fair and b of which are biased to land heads with probability 23. a coin is drawn
suppose that 12 observations are drawn from a normal population. the observations are 15 912 11 8 12 11 7 15 9 6 and
Describe what do you mean by terms 'false positive" and " false negative".
The probability that a student passes mathematics is 2/3 and the probability that he passes biology is 4/9. If the probability of passing one course is 4/5, what is the probability that he will pass both courses?
We wish to determine whether the homicide rate is different in different parts of the country and, if it is different, what is the pattern. We have data on 36 states - 9 each in the four regions Northeast, Midwest, South and West.
If $145,000 is to be distributed as a dividend for the current year, what total amount will be distributed to the preferred stockholders?
1. The data below are the colors of cars that came through the Starbuck's drive-thru between 9am and 10am on a particular day.
The famous YS Chang restaurant is open 24 hours a day. Waiters and busboys report for duty at 3am, 7am, 11am, 3pm, 7pm, or 11pm, and each works an 8 hour shift. The following table shows the minimum number of workers needed during the six periods ..
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