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A ski resort collects data on the number of days per year where the temperature is below 32 degrees and annual profits. The standard deviation of annual profits is = 56,965. The standard deviation of days below 32 degrees is = 8.79. The correlation is .74. If we are predicting annual profits from number of days below 32 degrees, compute the regression coefficient. Using the phrase given in class (On average, ...), explain in words what this slope means. Does this regression coefficient make sense?
Determine a point estimate of population mean. Determine the 99% confidence interval of true mean weight of the minivans.
It is suspected that the mean turnover has changed and is not 6.0. Use the .05 significance level. State the decision rule.
Authorized persons from a facility containing classified information. The device will ?erroneously admit 1 in 10,00,000 unauthorized persons. Assume that 95% of those who ?
Determine whether the Zero Population Growth data for urban U.S. resident is also true for rural U.S. residents on the basis of the sample data with α=0.05.
Calculate a 95% confidence interval for the average lifetime of the washing machines that the company uses. Calculate the sample size required to reduce the margin of error for a 95% confidence interval down to 7 (i.e. E = 7).
Multiple comparison procedures are going to be done using the Bonferroni method with = 0.05. The value of t** is 2.4667. Which of the following is the appropriate conclusion from carrying out these multiple comparisons?
A computer system uses passwords constructed from the 26 letters (a to z) or 10 integers (0 to 9). Suppose there are 10000 users on the system with unique passwords. A hacker randomly selects (with replacement) passwords from the potential set.
The inspector samples 12 cases at random, and subsamples 3 cans randomly from each selected case. Estimate the total number of worm fragments, along with a 95% confidence interval.
We want to determine if the proportion of people in the population who believes this is less than 0.75. What is the p-value?
The flashlight batteries produced by Manufacturer X are known to have a mean life of 60 hours, with a standard deviation of 4 hours. At least what percentage of flashlights will have a life of 54 to 66 hours?
A test is given to graduates of tw buisness schools A and B. The scores are given out of 100. Test whether the school differ in quality by using Mann- Whitney U- test with a 10% level of significance.
Formulate a research hypothesis to test one population parameter and another to test two (or more) population parameters.
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