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Nationwide, the average waiting time until electric utility customer service representative answers a call is 300 seconds per call. The Gigantic Kilowatt Energy Company took a sample of 35 calls and found that, on the average, they answered in 240 seconds per call with a standard deviation of 50. Can the company claim that they are faster than the average utility?
a. No, because -0.20 falls in the critical region
b. Yes, because -7.10 falls in the critical region
c. No, because -1.20 falls in the critical region
d. Yes, because -0.20 falls in the critical region
A loaf of bread is normally distributed with a mean of 22 oz and a standard deviation of 0.5 oz. What is the probability that a loaf is more than 22.25 oz?
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?
There are two telephone lines A and B. Let E1 be the event that line A is being used and E2 be the event that line B is being used
Given 7 male individuals in a Physical Education course, the number of sit ups each individual can do in a one minute period was recorded:
Find the mean ______________ and the standard deviation _____________
Calculate the test statistic. Determine the p-value of the test-statistic.
At the .05 significance level, is the number of units produced on the afternoon shift larger?
How large a sample is required if the 97 percent level of confidence is used and the estimate is to be within $2,500? The standard deviation is $16,000.
A check of dorm rooms on a large college campuses revealed that 38% had refrigerators, 52 percent had TVs and 21 percent had both a TV and a refrigerator. What's the probability that a randomly selected dorm room has.
Make a decision using the Decision Rule approach at given α = 0.05.
A professor of math refutes the claim that the average student spends 3 hours studying for the midterm exam. Which hypothesis is used to test the claim?
Determine the probability of choosing at random license plate which ends in the even number?
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