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A random sample of 16 Google managers yields the following information on annual salaries. The sample mean is $69,000, with a sample standard deviation of $4,000. What is the mean salary of all Google managers? What is the 95% confidence interval for the population mean?
What type of shape would you expect the histogram of the sample size to have? What value would you estimate for the mean of the histogram of sample means?
Compare and contrast internal and external validity. Describe and give examples of research questions for which external validity is a primary concern.
A manufacturer wishes to estimate the proportion of washing machines leaving the factory that is defective. How large a sample should she check in order to be 93 percent confident that the true proportion is estimated to within 0.014?
In the past, Bly has tended to estimate warranty expenses on the high end to be conservative. He must work with the dealership's accountant at year-end to arrive at the warranty expense accrual for cars sold each year.
We want 95% confidence that the sample mean is within $5 of the population mean, and the population standard deviation is known to be $63.
A random variable X that has pmf given by p(x) = 1/ (n+1) over the range Rx = {0,1,2,...,n} is said to have a discrete uniform distribution. Find the mean and variance of this distribution.
A software company wants to determine whether there is a relationship between their three sales offices and the sales of their software products. The actual sales results are
1.suppose we have a loaded die which gives the outcomes 1 through 6 according to the probability distributionnbspnote
Authorized persons from a facility containing classified information. The device will ?erroneously admit 1 in 10,00,000 unauthorized persons. Assume that 95% of those who ?
The State Game Commission set on length, if it is desired that 91% of the fish caught may be kept by fisherpersons? There is no limit on size for trout that exceed the minimum.
You perform a one sample mean hypothesis test on a random sample of data and observe a p-value of 0.2157. What is the appropriate conclusion? Conclude at the 5% level of significance.
question suppose you have an investment a whose return is normally distributed with mean 8 and standard deviation of
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