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1. Over the past year, an audio store has sold stereo systems produced by three different manufacturers. Of the 400 units from company A, 12% were returned for service during the warranty period. This compares to 15% of 300 units from company B, and 16% of 500 from company C. Assuming that the store's sales are a representative sample of the stereo systems produced by the three manufacturers, use the 0.025 level of signifi- cance in testing whether the population percentages of warranty service returns could be equal.
2. Union members in a large firm work in three departments: assembly, maintenance, and shipping/ receiving. Twenty of a random sample of 30 assembly workers say they intend to ratify the new contract negoti- ated by union leaders and management. This compares to 30 of 40 maintenance workers and 25 of 50 shipping/ receiving workers who say they will ratify the contract. At the 0.025 level of significance, test the null hypothesis that the population proportions are the same for all three departments.
the bureau of labor statistics american time use survey showed that the amount of time spent using a computer for
Assume that the number of calories in 12-ounce soda cans is normally distributed. State the null and alternative hypotheses to test the manufacturer claim.
If one of the 1200 pacemakers is randomly selected and is found to be defective, what is the probability that it was manufactured in Atlanta?
Analysis of Variance (ANOVA) is used to test the equality of the means of three or more groups based on sample data. ANOVA is really a test of means even though it sounds like a test of variance.
a researcher uses a repeated-measures design to compare individuals performance before treatment with their performance
The average number of television sets in the sample households turns out to be 1.86, and the SD is 0.86. Find a 95% confidence interval for the average number of television sets per household.
you are conducting a study to see if students do better when they study all at once or in intervals. one group of 12
testing for equality of variances.independent random samples were taken from normal distributions of the yearly
abc news conducts an election day poll by randomly selecting voting precincts in new york then interviewing all voters
a) Is this an upper tail, lower tail, or two-tail test? b) Are we testing means or proportions? c) State the rule of rejection (in terms of p-value and level of significance)
Using this data set, compute the: mode, median, mean, range, interquartile range, variance, standard deviation and coefficient of variation
Experience has shown a company that the cost of delivering a small package within 24 hours is $14.80. The company charges $15.50 for shipment but guarantees to refund the charge if delivery is not made within 24 hours.
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