What are the z scores above and below
What are the Z scores above and below the mean that contain the middle 90% of a normal distribution?
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When presented with a new data set it makes sense to find the "center" of the data in order to check that it behaves as expected and to understand its properties. This examines three main aspects of the data distribution. What are the three main a
Find the test statistic, P-value, and critical value. Round to 3 decimal places. Claim: The mean IQ score of statistics professors is greater than 118. Sample data: n = 50, x = 120. Assume that ? = 15 and the significance level is ? = .05
Assume that the actual surgery duration of this operation suite has a sample mean as x=70 minutes and standard deviation as s=15 minutes. The sample size is n=248. Construct a point estimation for the mean of actual surgery duration, and give its
If IQ scores are normally distributed with a mean of 100 points and a standard deviation of 15 points, what proportion of test takers have a score equal or greater than 115?
To calculate beta requires making a "what if" assumption about the true population parameter, where the "what-if" value is one that would cause the null hypothesis to be false.
What kind fo test should we use to evaluate whether there are differences in the proportion of people with cancer in the different power line exposure groups? State any assumptions that are required to perform the test and evaluate whether they ar
Explain how you would select a distribution for a hypothesis test or confidence interval?
Let X have the cumulative distribution function F(x) = 1-e^-x-1, x > -1. Find µ of X by using the MGF of X.
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