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Suppose the waiting time at a restaurant is normally distributed with a mean of 12 minutes and a standard deviation of 6 minutes. What is the probability that it will take less than than 20 minutes to receive your meal (please round your answer to 4 decimal places).
A random sample of 100 observations is obtained from a normally distributed population with a standard deviation of 10. What is a 95% confidence interval for the mean of the population if the sample mean is 40?
An advertising agency that serves a major radio station wants to estimate the mean amount of time that the station's audience spends listening to the radio daily. From past studies, the standard deviation is estimated as 45 minutes.
Can we conclude that car size is dependent on marital status? YES or NO (circle one)
What is the probability for the given frequency distribution?
Calculate a 3-month moving average forecast for months 4 through 9 also Compare the two forecasts by utilizing MAD. Which forecast appears to be more accurate.
What is the probability that the sum of their scores exceeds 1200 and probability that the average of the scores of all 400 student
If Household is selected at random, find out the probability that it feels economic conditions are good?
Toledo, OH has been experiencing improved economic growth following huge capital investments from companies like Chrysler. You have just been hired by RGP, an agency for facilitating business expansion and location in the Toledo metropolitan area.
Data from a National Health Survey show that men's average weight is normally distributed with a mean of 172 pounds and a standard deviation of 29 pounds.
What is the probability that the drug will be effective for 3 hours or more?
Explain these results to a person who understands the t test for a single sample but knows nothing about the t test for independent means.
If the population mean is estimated within two days, how many salespeople should be sampled?
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