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It is known from previous studies that the population variances are 4.6 and 5.0 respectively. Using a level of significance of .05, is there evidence that the dual degree students are receiving lowe
What is the minimum number of employees that should be sampled by a corporation if it wishes to estimate the true difference in the means of the number of years to retirement of its men and women em
What is the probability that Susan passes on the first try? What is the probability that Susan needs three or more tries to pass Western Civilization?
How to construct a 95 percent confidence interval for the population proportion of positive drug tests.
Of the total population of American Households, inluding older Americans, 17.3% receive retirement income. In a random sample of 120 households, what is the probability that greater than 20 househol
A rock specimen is randomly selected and weighed two different times. What is the mean of X1? What is the mean of X2?
determine how large a random sample should be if one wants a 99 percent level of confidence for the population mean with a precision of plus/minus 2 kilograms
The seven scores listed here are axial loads (in pounds) for the first sample of seven 12-oz aluminum can. An axial load of a can is the maximum weight supported by its sides, and it must be greater
You want 90% confidence that your estimated proportion is within 2.5 percentage points of the true proportion. A previous poll suggests that the proportion is 85%. How large must your sample be?
What is the probability that 30 or more paid by credit? d. What is the probability that less than 12 paid by credit? e. What is the probability that 12 to 30 paid by credit?
A car salesman claims that the variance of prices on convertibles is higher than the variance of prices on station wagons. The standard deviation of the list price on 16 convertibles is $6800 and th
What is the probability that the sample percentage of correct identifications is greater than 65%?
Of the students who scored around 50 on the midterm, about what percentage were in the top 25% of the class on the final?
A biologist estimates that 80% of the deer in a region carry a certain type of tick. For a sample of 300 deer selected at random, what is the chance that 246 or fewer deer have this tick?
The average diameter of sand dollars on a certain island is 4.50 centimeters with a standard deviation of 1.00 centimeters. If 9 sand dollars are chosen at random for a collection, find the probabil
Past data reveals that the graduation rate was 72% for the medical school at a university. If 10 medical students are randomly selected for that school. Find the probability that only 4 of them will
A researcher conducted a study of the access speed of 35 hard drives and concluded that his maximum error of estimate was 35. If he were to conduct a second study to reduce the maximum error of esti
Discuss the differences and relationship between correlation and determination as it applies to linear regression analysis.
A report states that 38% of home owners had a vegetable garden. How large a sample is needed to estimate the true proportion of home owners who have vegetable gardens to within 4% with 95% confidenc
Regression and Correlation are the most used and most abused tools in research. People are quick to jump to conclusions that if a relationship exists between two variables, then one must cause the o
Suppose this player gets to shoot three free throws. Find the probability that he makes at least one of the three consecutive free throws.
A recent survey indicated that the average amount spent for breakfast by business managers was $7.58 with a standard deviation of $0.42. It was felt that breakfasts on the West Coast were higher th
A doctor claims that the standard deviation of systolic blood pressure is 12 mmHg. A random sample of 24 patients found a standard deviation of 14 mmHg. Assume the variable is normally distributed.
Based on the information in part (a), what decision should the director make about the books used for the courses if the goal is to keep the cost below $300?
An auto manufacturer advertises that "90% of the cars we've ever made are still on the road." a) Assuming this is literally true, how can it be explained?