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Purchased Mailing E-Mail TotalYes 26 11 37No 227 247 474Total 253 258 511
At 0.05 level significance, is there evidence of the difference in proportion of dvds purchased on basis of the kind of media used (Mailing, E-Mail)?
Find the standard normal area for each of the following: (Round the answers to 4 decimal places.)
Use the marginal probabilities of school quality, school cost or convenience, and other to comment on the most important reason for choosing a school.
In a survey of women in a certain country (ages 20-29) the mean height was 64.5 inches with a standard deviation of 2.75 inches. What height represents the 90th percentile? What height represents the first quartile?
A random sample has been taken from a normal distribution and the following confidence intervals constructed using the same data: (38.02, 61.98) and (39.95, 60.05). What is the value of the sample mean?
Give a 99% confidence interval for the mean increase in pay for all corporate CEOs.
Dotties Tax Service specializes in federal tax returns for professional clients, such as physicians, dentists, accountants, and lawyers.
If you are using exponential smoothing for forecasting an annual time series of revenues, what is your forecast for the next year if the smoothed value for this year is $32.4 million?
If it is determined that there is no difference between the population mean being represented by the sample and the mean of the population at large, then:
What is the theoretical probability that Mr. Nerdly assigns 10 homework problems as a result of a randomly selected student playing the birthday game?
For a t distribution with 16 degrees of freedom, find the area, or probability, in each region.
a) Find the marginal density of Y. b) Find E(X) HINT: What is E (X|Y=y) ?
Compute the expected number of barrels that will be sol on Saturday. (Answer to Whole numbers)
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