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For many years, TV executives used the guideline that 30 percent of the audiences were watching each of the prime-time networks and the 10 percent were watching cable stations on a weekday night. A random sample of 500 viewers in the Tampa - St.
Petersburg, Florida area last Monday night showed that 165 homes were turned in to the ABC affiliate, 140 to the CBS affiliate, and the remainders were viewing a cable station.
At a .05 level of significance, can we conclude the guidelines are still reasonable?
Construct a 95% confidence interval for the proportion of all those who experience some type of discomfort.
There are 6 different factors labeled as A, B, C, D, E, and F. Given that D=AB, E=-AC, F=-BC, please provide the corresponding 26-3 design table. Also, please write down the complete defining relation and the complete effect alias structure.
Make up a scatter diagram with 10 dots for each of the following situations:
The following frequency distribution was obtained. The data values are in hours. Construct a histogram for the data .
A person makes random guesses for 10 true-false questions on a test. Find the probability that the student answers at least one question correctly.
How many voters required to be sampled to evaluate the proportion within 0.05 with 95% confidence?
You are investigating the flight characteristics of different kinds of birds. You collect a sample of 33 European swallows (Hirundo rustica) and measure their air-speed velocity in a borrowed wind tunnel.
Below are bowling scores for several UMUC statistics professors. Based on output from ANOVA, who is the better bowler (for those of you who don't bowl, a numerically higher score indicates a better score)?
This activity is a revision of an activity found in Real Data: A Statistics Workbook Based on Empirical Data by Z. C Holcomb (1997). Published by Pyrczak Publishing.
Does it seem prevention plans were effective in reducing mean amount of a claim? Use 0.05 level of significance. Set up Null and Alternate Hypothesis.
The random variable x is known to be uniformly distributed between 1.0 and 1.5.
An analyst wishes to include number of older siblings in family as a predictor variable in a regression analysis of factors affecting maturation in eighth graders.
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