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Alice scored 76 on the first psychology exam. The mean was 56 and the standard deviation was 20. On the second exam, she scored 82; the mean was 74 and the standard deviation was 5. On which exam did she do better?
54% of men consider themselves professional baseball fans. You randomly select 10 men and ask if he considers himself a fan. Find the probability that the number who consider themselves professional fans is
What is the appropriate procedure to test for a significant difference in means between the two groups? Implement the procedure in problem using the critical value method
If a null hypothesis is rejected at a significance level of .01, it will ______ be rejected at a significance level of .05
Find a 95% confidence interval for the mean amount spent by patients at the pharmacy. Show your calculations and/or explain the process used to obtain the interval.
This sample is 500 so the distribution of the sample means will be normal, no matter what the shape of the actual distribution of dollar losses.
If an overrun contract was bid at 12 million dollars, what does the least-squares line predict for the cost of overrun (as a percent of bid price)?
Plot the data, fit a trend line, and discuss the strength of prediction of the regression model.
Of 1338 people who came into a blood bank to give blood, 253 people had high blood pressure. Estimate the probability that the next person who comes in to give blood will have high blood pressure.
If we wanted to shorten the interval of the estimation of the true mean of Saturday sales to a width of $600 in total, what should the size of our sample be to achieve it?
There are two telephone lines A and B. Let E1 be the event that line A is being used and E2 be the event that line B is being used
Find a 95% confidence interval for the proportion p of the inner-city, working-class group who eventually became alcoholics.
What will be critical value of chi-square if test is to be performed at 0.025 level? At the 0.05 level?
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