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Suppose that an automobile manufacturer designed a radically new lightweight engine and wants to recommend the grade of gasoline to use. The four grades are below regular, regular, premium, and super premium. The test car made three trial runs on the test track using each of the four grades. Assuming any grade can be used at the 0.05 level, what is the critical value of F?
Kilometers per liter
Below Super
Trial # Regular Regular Premium Premium
1 39.31 36.69 38.99 40.04
2 39.87 40.00 40.02 39.89
3 39.87 41.01 39.99 39.93
British scientists have developed a 15 minute brain scan they hope could be used to detect autism in children. Autism and related disorders affect up to 7 out of every 1000 individuals.
An accepted standard deviation for LSAT scores is 125. A random sample of 25 scores had an average of 1,375. Assume a significance level of 0.05. State the appropriate null and alternative hypotheses. Calculate the p-value to test the hypotheses.
How do you solve this problem: a researcher conducted a study of the access speed of 50 hard drives and concluded that his maximum error of estimate was 24.
Last week Sarah had exams in Math and in Spanish. On the Math exam, the mean was u, = 30 with a = 5, and Sarah had a score of X - 45. On the Spanish exam, the mean was u, = 60 with 0 = 6 and Sarah had a score of X = 65. For which class must Sarah ..
Why might driver be tempted not to use seat belt "just on this trip"?
Determine the mean number of times the machine was used per day.
Calculated the probability of observing a sample proportion of voters 0.55 or higher supporting the incumbent governor.
If you must estimate the population mean within 10 days, how many outside salespeople should you sample? Use the 90 percent confidence level.
At a 5% level of significance, is there evidence to conclude that the mean life is different from 375 hours?
Estimated the probability that among 75 randomly selected students, at least 20 of them score greater than 78.
Form the cumulative percentage distribution and plan a cumulative percentage polygon.
At the end of the Halloween Festival the organizers estimated that a family of participants spent in average $50.00 with a standard deviation of $15.00. If 49 participants (49 = size of the sample) are selected randomly, what's the likeihood that ..
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