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On a standard IQ test, the standard deviation if 15. How many random IQ scores must be otained if we want to find the true population mean (with an allowable error of 0.5) and we want 97% confidence in the results?
question team sports inc. sells sporting goods to high schools and colleges via a nationally distributed catalogue.
The following table shows the hardness (in Brinell hardness numbers) and the tensile strength (in thousands of pounds per square inch) of ten specimens of a certain alloy.
if the standard deviation of the lifetime of a vacuum cleaner is estimated to be 300 hours how large of a sample must
in a study conducted by ucla it was found that 30 of college freshmen support increased military spending. if 12
If sensitivity and specificity remain constant, determine the relationship of prevalence to predictive value positive and predictive value negative?
In healthy adults, x is approximately normally distributed with mean µ = 38 and standard deviation σ = 12. What is the probability that:
a seed company advertises that the mean time for planting to harvest for a new variety of zucchini seeds is 45 days.
probability based on binomial distribution.1 suppose that pe 0.76 pf 0.45 and pe and f 0.32. what is p e or f?2
A researcher is using a chi-square test to determine whether there are any preferences among four brands of cola. With alpha = .05 and a sample of n = 30, what is the boundary for the critical region for the hypothesis test.
He estimates that he/she has a 45% chance of success with each customer. What is the probability that he/she will earn his/her bonus today?
the number of bank robberies that occur in a large north american city is poisson distributed with a mean of 1.8 per
We have a deck of 52 playing cards. What is the probability of drawing?
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