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We wish to detect a mean difference of 0.25 for a variable that has a standard deviation of 0.67. How large a sample is needed to detect the mean differences with 90% power at α = 0.05 (two-sided)?
Create a stem-and-leaf display of these data.- Write a brief description of the distribution. Be sure to discuss the overall shape as well as any unusual features.
as a statistician you are asked to give advice on designing a customer appreciation event for the bookstore. the
A process starts in state 0. Annuity contract 1 provides for periodic payments, provided the process is in state 1. Find the probability that a payment is made at time 3.
A critic says, "Aha! You claim 90%, but in your sample the on-time percentage is lower than that. So the 90% claim is wrong."
Shown below are the results of a one sample t test. Make up a problem that someone could solve using the printout. Do not make up the data. Just assume the data were collected and produced the given statistics.
A market analyst believes that more than 30% of the adults in a certain area regularly read a certain magazine. What are the appropriate statistical hypotheses.
What is the lower bound of the 95% confidence for a sample of size 87 with mean 64 and standard deviation of 6 compared to a population mean
Before deciding, the decision maker considers listening to the weather forecast on the radio. Draw an influence diagram that takes into account the weather forecast.
what are the degrees of freedom for hartleys test statistic for a one - factor anova with n1 5 n2 8 n3 7 n4 8 n5
If 8 babies born in the hospital are randomly selected, what is the probability that at most 1 of them are boys?
suppose you work for a company that manufactures electronics. the development analysts estimate that 2 of their
What is wrong with this design? What confounds could be leading to the results of improved memory and problem-solving skills?
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