In a sample of 855 bartenders, 48% heard complaints from patrons about work. If the margin of error was 4.4%, what was the confidence level that was used?

4. In order to determine whether or not the number of automobiles sold per day (Y) is related to price (X1 in $1,000), and the number of advertising spots (X2), data were gathered for 7 days. Part of the regression results is shown below. Coefficient Standard Error Constant 0.8051 X1...

An auditor wants to estimate what proportion of a bank's commerical loan file are incomplete. The auditor randomly samples 60 files and finds 12 are incomplete. Using a 95% confidence interval, estimate the true proportion of the incomplete files for All the bank's commericial loans....

87. Refer to the Real Estate data, which reports information on homes sold in the Denver, Colorado, area last year. 1. Select the variable selling price. 1. Find the mean, median, and the standard deviation. 2. Write a brief summary of the distribution of selling prices 2. Select the...

Feb; 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. A key measure of customer satisfaction is the response of a scale from 1-10 to the question: considering all the business you do with B....

If Mary gets a 90 on a physics test where the mean is 85 and the standard deviation is 4.59, where does she stand in relation to her classmates?

In July 29 2002, the gallup organization issue of the Journal News (H Ohio) Lynn Elber of the Associated Press reported on a study conducted y the Kaiser Family Foundation regarding parents use of television set V-chips for controlling their children s TV viewing. The study asked parents who...

"For this exam, assume that you are working on a team that has been commissioned by a large school district to collect and analyze data related to a recent curriculum experiment designed to improve student scores on state-wide standardized tests. The schools in this district are...

Exercises ** Test IV ** Saturday Fall 2010 MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. Solve the problem. 1) Find the value of -z /2 that corresponds to a level of confidence of 92.50 percent. 1) A) 1.78 B) -1.44 C) -1.78 D)...

mean lifetime of bulbs is 44 months. standard deviation of the lifetimes is 8 months. thirty-four bulbs are selected at random and their mean lifetime is found to be 41 months can we conclude at the 0.01 level of significance that the mean lifetime differs from 44 months