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A survey is being planned to determine the mean amount of time corporation executives watch television. A pilot survey indicated that the mean time per week is 20 hours, with a standard deviation of 5.5 hours. It is desired to estimate the mean viewing time within two-quarter hour. The 90 percent level of confidence is to be used.
a) How many executives should be survyed? Number of executives ______. (Round up your answer to the next whole number.)
determine if the improvement is of practical significance one should. Crop researchers plant 100 plots with a new variety of corn. The average yield for these plots is x' = 130 bushels per acre
Explain how much should the airport authority be willing to pay for perfect information about the success of a brand new airport.
Give an example of a hypothesis test you could perform at work or at home. State what the Null and the Alternative hypotheses would be in your test.
If the payoff from outcome A is twice the payoff from outcome B, then the ratio of these utilities will be.
What is the probability that of the last 100 new juvenile delinquents put on probation, 30 or more will commit another crime?
Multiple choice question based on multiple regression - partial computer output based on a sample of 16 observations and find the estimated regression equation
If measurements are made over span of 9 months, and results are averaged, find out the probability that neighbourhood is considered unsafe?
Public transportation and the automobile are 2 methods an employee can use to get to work each day. Samples of times recorded for each method are shown. Times are in minutes.
Multiple choice question based on multiple regression - The coefficient of determination for this model is
Which component of a time series is most likely to occur? Which component has a pattern that must be complete in a single year and repeat from year to year?
At.05 level of significance test to find out if number of breakdowns is independent of shift.
For which of the following situations is it appropriate to use a scatter diagram or scatter plot?
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