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A random sample has been taken from a normal distribution and the following confidence intervals were constructed using the same data: (38.02, 61.98) and 39.95, 60.05). a. What is the value of the sample mean? b. One of these intervals is a 95% CI, and the other is a 90% CI. Which is the 90% CI and which is the 95% CI, and why?
The mean of a normal probability distribution is 60; the standard deviation is 5.
in an analysis of variance summary table if the mean square between 43 and the mean square within23 then the null
a.nbspthe random variable x is the number of siblings of a student selected at random from professor appiahs
You are interested in whether men participate more than women in political activities, so you survey 632 men and 675 women and ask them how many political events they attended within the past year. Here are your results.
among 18 patients with depression the mean number of treatment days was 4.7 with a standard deviation of 9.3. for 10
singer suggests that although the right to sell blood does not threaten the formal right to give blood it is
A local health center noted that in a sample of 400 patients 80 were referred to them by the local hospital. What size sample would be required to estimate the proportion of hospital referrals with a margin of error of 0.04 or less at 95% confiden..
Find the area between z = -0.65 and z = 0.37, find the area to the right of z = 2.35
ComputerWare asked 500 of its iMac purchasers what computer they owned or had owned. There were 83 new computer owners, 60 who had owned a Windows-based computer, and 357 who had owned a Macintosh.
1.a researcher wants to know if the average time in jail for robbery has increased from what it was several years ago
For a large group of overseas passengers, the mean is 78 pounds and the standard deviation is 15 pounds. compute the relative dispersion of each group.
several statistical tests have a way to measure effect size. what is this and when might you want to use it in looking
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