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The manager of a local gymnasium has determined that the length of time patron spend at the gymnasium is normal distributed with mean 80minutes and standard deviation 20 minutes. What is the patrons who spend more than 120 minutes at the gymnasium.
Suppose a product must go through a sequential assembly line made up of ?ve operations. The time it takes to complete each operation is normally distributed with a mean of 180 seconds and standard deviation of 5 seconds.
Of the 1,4000 homemakers sampled, 420 were able to identify the brand by name. Estimate the value of the population proportion.
State the null and alternative hypotheses you would use to test whether the year-end bonuses paid by Jones & Ryan were different from the population mean.
First-order regression model was fit to data. Part of printout follows?
The heights of young women are approximately normal with mean 65 inches and standard deviation 2.5 inches.
It is suspected that the mean turnover has changed and is not 6.0. Use the .05 significance level.
Plot fitted values against residuals. Does this plot point out any problems with homoscedasticity?
An independent financial advisor claims an average rate of return, μ, on a particular investment is at least 7%. In testing her claim, the correct pair of hypotheses is:
Find a 90% confidence interval for the population mean weight of all such turtles.
It is suspected that the mean turnover has changed and is not 6.0. Use the .05 significance level. State the null hypothesis and the alternate hypothesis.
Estimate with 90% confidence the difference in the level of satisfaction with service between the two branches.
To find weighted aggregate price index using Laspeyres and Paasche method.
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