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A manufacturer knows that their items have a normally distributed length, with a mean of 10.3 inches, and standard deviation of 0.7 inches. If 21 items is chosen at random, what is the probability that their mean length is less than 10.5 inches.
How much difference does the choice of model make? Which forecasts do you trust the most, and why? (f) If you have access to Ward's Automotive Yearbook, check your forecasts.
Calculate and post your 'answers' or interpretations of (a little bit of a review of the fundamental concepts): The three Measures of Center (Mean, Median, and Mode).
We want to test the hypothesis about fairness of spinning the coin. Evaluate the true proportion of heads. Use 95% confidence interval. Do not forget to check conditions first.
Random variables x and y have the joint density function. Find the value of the constant a
Test the claim that the proportion of students in this district who use computers in school is at least 80%. State the correct hypotheses.
Is the z value positive or negative? Explain why it should be positive or negative.
A transatlantic plane carries 140 passengers. It is known that the average weight of all passengers on that plane is 147.14 pounds, that the men on that plane weigh on the average 170 pounds, and women 130 pounds. How many men and how many women w..
What could Bristol Myers have done to improve the validity of the results after they had mailed the 10,000 surveys and received 1,983 back? Assume they kept record of who had responded and who had not.
what is the expected number of claims by males under 25? what is the standard deviation of the distribution. (How to show on excel using binodist formula).
Weekly income of more than $429.35, the value of the standard deviation of the weekly earnings of the bus drivers is 15. is it true?
By how much does the standard error of x-bar change if the sample is increased to 100?
A social psychologist is studying college students attitudes toward drinking and driving. He is specifically interested in attitude change as a result of years in college and of viewing the consequences of drinking and driving accidents.
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