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Independent random samples, each containing 90 observations, were selected from two populations. The samples from populations 1 and 2 produced 31 and 19 successes, respectively.
Test H0:(p1-p2)=0 against Ha:(p1-p2)≠0
Use α=0.05
(a) The test statistic is
(b) The P-value is
a friend of mine is giving a dinner party. his current wine supply includes 8 bottles of zinfandel 12 of merlot and 11
the time to failure of an electrical component in constant failure rate mode follows an exponential distribution with
When are differences between average or actual results important and how can you or your department decide whether or not the observed differences over time are important?
Given that x-bar = 18.60, s = 3.48, n = 18, and the population is known to be normally distributed, find the LOWER boundary, only, of the 95%
the upper limit of the 95 confidence interval for the population proportion p given that n 300 and hat p 0.10 is
An aircraft company is considering using a new light-weight fastener, called the Superlight, to rivet certain sheet metal parts together.
The procedure square-list takes a list of numbers as argument and returns a list of the squares of those numbers. (square-list (list 1 2 3 4)) (1 4 9 16) Here are two different definitions of square-list. Complete both of them by filling in the mi..
He picks an SRS of 30 recruits and calculates their mean 5K time is 16 minutes 52 seconds, with a standard deviation of 25 seconds.
Given the assumed sample result, comment on whether Wal-Mart might be typical of other companies in terms of their error rate for scanning sale items.
What type of exercise (often practiced by historians) would be a corrective to a historian's teleological argument? Explain why?
Suppose that the life expectancy X of each member of a certain group of people is an r.v. having the Negative Exponential distribution with parameter l = 1/50 (years). For an individual from the group in question, compute the probability that
A weight-loss company wants to statistically prove that its methods work. They randomly selected 10 clients who had been on the weight loss program for between 55 and 65 days. They looked at their beginning weights and their current weight. The st..
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