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Jim is in the 23rd percentile rank and Jessica is in the 59th percentile rank. The variable is age and not at all normal. Is it possible to tell what proportion of people are older than Jim but younger than Jessica? If so, please calculate the number. If not, explain why.
A normal population has a mean of 60 and a standard deviation of 3. You select a sample of 36. Compute the probability the sample mean is (Round z values to 2 decimal places and final answers to 4 decimal places):
The following data are daily price quotations of two stocks: Stock A: 12.50, 12.75, 12.50, 13.00, 13.25, 13.00, 13.50, 14.25, 14.00. Is there a correlation between the two stocks? Explain.
What sample size would be needed for an error of ± 1.5 with 98 percent confidence? (Data are from a project by MBA student Wendy Blomquist.)
At α = .01, did yellow fire trucks have a considerably lower accident rate? Determine sample proportions and z test statistic.
"In each of the following situations, a hypothesis test for a population mean is needed. For each situation select the correct choice of the null hypothesis H0 and the alternative hypothesis Ha.
I have two contingency tables. One has a chi-square value of 14.40 and the other is 27.86. Both have 6 degrees of freedom. Based on an alpha of .01 do you reject the null hypothesis?
Identify the null hypothesis, alternative hypothesis, test statistic, p-value or critical value(s), conclusion about the null hypothesis, and final conclusion that addresses the original claim.
Prices (in dollars) were recorded for a sample of 60 randomly selected grocery items at each of the three supermarkets. In order to reduce item-to-item variation, the prices were recorded for each item on the same day at each supermarket. Identify..
A bowl contains 16 chips, of which 6 are red, 7 are white, and 3 are blue. If four chips are taken at random and without replacement, find the probability that: there is at least one chip of each color.
Describe the purpose of transforming raw scores into standard scores. Describe what "normal distribution" means.
In a poll of 1,004 adults, 93% indicated that restaurants and bars should refuse service to patrons who have had too much to drink. Construct the 90% confidence interval for the proportion of all adults who feel the identical way.
Find the probability that number of college students who say they use credit cards because of there wards program is (a) exactly two, (b) more than two.
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