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Nationwide, the average time until a electric utility customer service representative answers a call is 260 second. The Gigantic Kilowatt Energy Company randomly sampled 30 calls and found that, on average, they were answered in 227 second with a population standard deviation of 40 seconds. Can the company claim that they are faster than the average utility at a = 0.05?yes, because the test value -4.52 falls int he critical region
no, because the test value -0.83 falls in the critical region.
yes, because the test value -0.15 falls in the critical region.
no, because the test value -0.15 falls in the critical region.
Construct a 90% confidence interval on the difference in fraction nonconforming between the two processes."
A building contractor pays $500 to bid on a contract. If he gets the contract, the probability of which he estimates to be 0.70, he will make a profit of $50,000.
The animal colony in the reseach department contains 20 male rats and 30 female rats. Of the 20 males, 15 are white and 5 spotted. Of the 30 females, 15 are white, and 15 are spotted.
Using the Census data, the OH Registry of Motor Vehicles reveal the subsequent about the Autos owned by the 10 families residing in Smallville.
The average could be a poor estimate of the spending of all teenagers given that only teenagers in malls were sampled.
a) Explain why it would be hard to take a Simple Random Sample? b) Describe how to take a cluster sample of chocolate chip cookies.
A clinical trial was conducted comparing a new compound designed to improve wound healing in trauma patients to a placebo. After treatment for 5 days, 58% of the patients taking the new compound had a substantial reduction in the size of their wou..
A safety engineer claims that only 40% of all workers wear safety helmets when they eat lunch at the workplace. Assuming that his claim is right, find the probability that at most 4 out of 6 workers randomly chosen will be wearing their helmets wh..
Mean=63.6 Standard deviation=2.5 If 36 data points are arbitrarily chosen, determine the probability that mean is less than 64.
In a sample of 855 bartenders, 48% heard complaints from persons about work. If the margin of error was 4.4%, what was the confidence level that was used?
1st a confidence interval is constructed without utilizing the finite population correction factor.
Which of the following is true about a 95% confidence interval of the mean of a given sample:
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