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Gas Station pump signs, at one chain, encourage customers to have their oil checked, claiming that one out of every four cars should have its oil topped.
a.) What is the probability that exactly 3 of the next 10 cars entering a station should have their oil topped?
b.) What is the probabily that at least half of the next 20 cars entering a station should have their oil topped?
Method of assigning probabilities based on historical data is known the?
Let be the average of the pay you receive for the first and second week. Find the sampling distribution
The result for University X was a mean of 5 hours and an estimated population variance of 2 hours; for University Y; and for University Z. What should you conclude? Use the .05 level. What should you conclude? Use the .05 level.
A computer password consists of four characters. The characters can be one of the 26 letters of the alphabet. Each character may be used more than once. How many different passwords are possible?
Under what circumatances do you use a one-sided confidence interval instead of a 2 sided confidence interval?
A certain airplane has two alternators to provide electrical power. The probability that a given alternator will fail on a 1-hour flight is.02.
A researcher measures a response variable Y and explanatory variable X on each of several objects. A scatterplot of the measurements is as follows.
At 95% level of confidence, can we conclude that the babies using the Gibbs product gained less weight?
The United States Postal Service reports that 95 percent of first class mail within the same city is delivered within two days of the time of mailing. Six of the letters are randomly sent to different locations.
At α = .05, is there a difference in variances? Illustrate all steps clearly, including illustration of the decision rule.
calculate the mean or expected value for the number of retransmissions and calculate the standard deviation for the number of retransmissions.
There are three flight phases. At α = 0.05, is the cockpit noise level independent of flight phase?
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