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A recent study indicated that 29% of the 100 women over age 55 in the study were widows.
a. How large a sample must one take to be 90% confident that the estimate is within 0.05 of the true proportion of women over ages 55 who are widows?
b. If no estimate of the sample proportion is available how large should the sample be?
Quality Progress, Feburary 2005, reports on the results achieved by Bank of America in improving customer satisfaction and customer loyalty by listening to the "voice of the customer".
Find a 95% confidence interval for the population mean selling price of all homes in this neighborhood.
Determine and report the within-group slope which relates Y to Xc (for this, you will have to look at your regression printout).
Please use the regression procedure within Excel under Tools > Data Analysis to construct this equation.
Test hypothesis that annual incomes of corporate trainers in areas of more than 500,000 are considerably more than those in areas of less than 100,000. Make use of the 5% level of risk.
Assume adults have IQ scores that are normally distributed with a mean of 105 and a standard dviation 20. Find the probability that a rondomly selected adult has an IQ betwwen 93 and 117.
So construct a multiple regression model for predicting the crime rate based upon various explanatory variables unemployment rate, median income, education level.
It is suspected that the mean turnover has changed and is not 6.0. Use the .05 significance level. Give the formula for the test statistic.
For every additional hour spent studying for the exam you would expect a grade improvement of 60.2 points
Find the power of the test designed to determine if the the new safety equipment is effective when the mean percent reduction is actually 2.3%. Assume that the population standard deviation is 12% and that α is 0.02. What is the power?
Test the teachers hypothesis that there is a significant difference between the pre and post tests.
A group of sheep, infested with tapeworms, are randomly divided into two groups as follows. Each sheep is assigned a number (1 through 20) and then 10 numbers
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