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A study of the effects of exercise used rats bred to have high or low capacity for exercise. There were 8 high-capacity and 8 low-capacity rats. The 8 high-capacity rats had mean blood pressure 89 with standard deviation 9, and the 8 low-capacity rats had mean blood pressure 105 with standard deviation 13. In constructing a 95% confidence interval for the difference of the two means (low capacity - high capacity) without additional software, what is the standard error? (Answer to the nearest hundredth.)
question a recent study indicated that 29 of 100 women over age 55 in the study were widows.a how large a sample
james teaches a class of 300 students and only 6 have done their homework assignment which is due today. he calls on a
The president of Doerman Distributors, Inc., believes that 30% of the firm's orders come from first-time customers. A random sample of 100 orders will be used to estimate the proportion of first-time customers. Assume that the president is correct..
A survey researcher compares 4 religious groups on their attitudes toward education. 1200 subjects receive the survey and 823 respond. There are 10 items; the likert scale is 1-5. A high positive score indicates a more positive attitude.
An insurance contract sold to (x) and (y) provides for a death benefit of 1 unit at moment of the first death. Find the initial annual rate of premium payment.
Best's Review (June 1999) compared the mortgage loan portfolios for a sample of 25 life health insurance companies. The information in the table on page 629 is extracted from the article.
a marketing analyst at an internet book store is testing a new web design which hopes to increase sales. she wants to
If random sample of 9 loads is selected for a weight check, determine the probability that mean weight of those loads is more than 40.60 tons.
When is regression used? What are the assumptions of Linear Regression? What is correlation? How does it differ from regression? What is the interpretation of the correlation coefficient?
Calculate the sample correlation coefficient by hand. By use of a spreadsheet calculate the sample correlation coefficient.
A researcher wants to know if there is a relationship between a person's highest level of education (IV) and differences in life satisfaction (DV).
What is his expected cash balance at the end of the following May and what is the probability that his balance will be negative in one or more month?
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