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Suppose the time spent by a randomly selected student who uses a terminal connected to a local time-sharing mini-frame computer facility has a gamma distribution with mean = 20 minutes and variance = 80 minutes.
a. What are the values of alpha and betab. What is the probability that a student uses the trminal for at most 24 minutes?c. What is the probability that a student spends between 20 and 40 minutes using the terminal.
What is the appropriate procedure to test for a significant difference in means between the two groups? Implement the procedure in problem using the critical value method
A pharmaceutical company has determined that if a new cholesterol-reducing drug is manufactured (introduced to the market) the following probability distribution will describe this drug's contribution to the company profits during the next six mon..
A researcher believes that the percentage of people who exercise in California is greater than the national exercise rate. The national rate is 20%.
If the limits of the confidence interval of the difference between the means of two normally distributed populations were 3.5 and 5.5 at the 95% confidence level, then we can conclude that we are 95% certain that there is a significant difference ..
At the .05 significance level, is there a difference in the mean number of calls per day between the two employees?
In a batch of 8,000 clock radios 9% are defective. A sample of 15 clock radios is randomly selected without replacement from the 8,000 and tested.
He would like 95% confidence intervals for the average price people would be willing to pay: one for the higher-income group, one for the lower-income group.
Sprinkler Systems. A manufacturer of sprinkler systems designed for fire protection claims that the average activating temperature is at least 135 degrees F.
We are certain the the average difference in reaction times between the two light types for all golfers is between 0.27 and 7.13.
Calculate a sample mean and standard deviation and then reject shipment if the sample average falls below some agree-upon value.
Recognize strategies that were utilized to control for nuisance variables and minimize threats to valid inference making.
Do 1-sample t-test to see if people in Chicago have travelled to fewer states than people nationwide. Utilize the 10% (.10) level of significance.
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