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A review of the records at Lander Community College revealed the following ethnic breakdown of the student population:
Caucasian 1200Black 640Hispanic 280Asian 80Native American 60Other 20
a) What is the probability that a randomly selected student is either Caucasian or Black?
b) What is the probability that the selected student is not a member of either of the two largest categories?
You are interested in determining the average cost of a 3-minute telephone call to locations within the continental U.S.
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.
It is believed that population standard deviation is 15 days. If test is conducted using a 0.05 level of significance, what conclusion must be reached?
Place a 95% confidence interval about the population mean number of down hours per month.
Assuming that the process is operating correctly according to specifications, what is the probability that a sample will indicate that an adjustment is needed?
Suppose that $126,000 is to be allocated for advertising, research, and investment in the ratio 10:4:2. How much money will be allocated for each?
How do hypothesis-testing procedures differ for the population mean when the population standard deviation is known or unknown? What is the relationship between two-sided hypothesis tests for means and confidence intervals?
The management of a regional bus line thought its cost of gas might be correlated with its passenger/mile ratio. Comment on the data and correlation matrix below.
A presidential candidate's aide estimates that, among all college students, the proportion p who intend to vote in the upcoming election is at most 65%.
The rest have no opinion. " Suppose that a a sample of 100 American adults is quizzed on the subject. What is the probability of the following events?
He would like to determine whether there are more units produced on the afternoon shift than on the day shift.
A IRS auditor randomly selects 3 tax returns from 48 returns of which 9 contain errors. What is the probability that she selects none of those containing errors? Round to four decimal places.
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