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2. In an article (Nanci Hellmich, " 'Supermarket Guru' Has a Simple Mantra," USA Today, June 19, 2002, 70) it was claimed that the typical supermarket trip takes a mean of 22 minutes. Suppose that in an effort to test this claim, you select a sample of 50 shoppers at a local supermarket. The mean shopping time for the sample of 50 shoppers was 25 minutes with a standard deviation of 8 minutes. Using the 0.05 level of significance, is there evidence that the mean shopping time at the local supermarket is different from the claimed value of 22 minutes? Use a one-sample hypothesis test.
Each scenario involves randomly selecting n i observations from four, independent, Normal populations as described.
ACT scores are normally distributed with mean 18 and standard deviation 6. Assuming that both tests measure the same kind of ability, who has the higher score, and why?
Multiply by 50 to get the middle 95% of the distribution of the gamblers winnings on nights when he places 50 bets. (d) What is the probability that the gambler will lose money if he makes 50 bets?
Make a decision regarding the null hypothesis based on the sample information. Interpret the results of the test and state your conclusion.
1.a refrigerator contains 6 apples 5 oranges 10 bananas 3 pears 7 peaches 11 plums and 2 mangos. imagine you stick your
Identify the null and alternative hypothesis, test statistics, p-value(or range of P-value), critical value(s), and state the final conclusion that address the original claim.
Calculate, test, and interpret the relationship between two variables using the correlation coefficient.
Discuss how the empirical rule helps explain the ways in which the values in a set of numerical data cluster and distribute. Regarding probability, discuss the differences between mutually exclusive events and collectively exhaustive events.
Four different assembly processes were under consideration. Sixteen workers were randomly assigned to the four processes, eight per process. The number of correctly assembled units in an eight-hour work shift was recorded:
If the basket ball player is a 74% free throw shooter, then, on average, how many free throws will he or she make in a game with eight free throw attempts?
Using the empirical rule what percentage of adults is 25 - 45 has iq score bet 70 and 130.
If you take the mean weights for random groups of 10 adults and form a new distribution, how will this new distribution compare to distribution of individuals?
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