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Let X be a normal random variable with a mean of 20 and a standard deviation of 4. Find P(X<=17).
Find the expected value if the cost of entering this sweepstakes is the cost of a postage stamp. Is it worth entering the contest?
What are the limitations of this analysis? Can you think of some hidden variables that could affect what you are seeing in the data?
Write the least squares prediction equation for y = total number of runs scored by a team in a season.- Conduct a test of H0: β7 = 0 against Ha: β7.
a firm wanted to see if there was a significant difference between two neighboring communities in terms of the mean
Using the emperical rule solve the following problems for a distribution with a mean of 20 and a stardard diviation of 5. At least what percentage of the values will fall between 15 and 25.
Find the probability that a randomly selected teacher earns and what sample size is necessary to double the standard error of the mean and what sample size is needed to cut the standard error of the mean in half?
She randomly surveys 426 schoolmates and finds that 150 report they fear public speaking. Conduct a hypothesis test at the 5% level of significance to determine if the percent at her school is less than 40%
a computer center has three printers a b c which print at different speeds. programs are routed to the first available
Identify an important rule of thumb from your organization that is used to make quick decisions.
Here are three groups of numbers. This problem and the ones that use this data set are designed to illustrate some relationships and to give you practice calculating ANOVA values.
Assume the data for the three groups are independent and the data are approximately Normal. The P-value is less than 0.01. The correct conclusion is that
Construction of histogram and pie chart for continuous data
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