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In an article in Marketing Science, Silk and Berndt investigate the output of advertising agencies. They describe ad agency output by finding the shares of dollar billing volume coming from various media categories such as network television, spot television, newspapers, radio, and so forth.
Suppose that a random sample of 40 U.S. advertising agencies gives an average percentage share of billing volume from network television equal to 7.46 percent, and assume that ∂ equals 1.42 percent. Calculate a 95 percent confidence interval for the mean percentage share of billing volume from network television for the population of all U.S. advertising agencies.
Suppose that a random sample of 40 U.S. advertising agencies gives an average percentage share of billing volume from spot television commercials equal to 12.44 percent, and assume that ∂ equals 1.55 percent. Calculate a 95 percent confidence interval for the mean percentage share of billing volume from spot television commercials for the population of all U.S. advertising agencies.
Compare the confidence intervals in parts a and b. Does it appear that the mean percentage share of billing volume from spot television commercials for U.S. advertising agencies is greater than the mean percentage share of billing volume from network television? Explain.
What is the probability of getting heads on only one of your flips and what is the probability of getting heads on at least one flip?
Can the human resource manager conclude, at the 5% significance level, that the job enrichment workshops increase sales consultants' job satisfaction levels? Present your findings to the human resource manager.
One of the most common forms of colorblindness is a sex-linked hereditary condition caused by a defect on the X chromosome (one of the two chromosomes that determine gender).
Suppose you are assisting the county assessor (whose job is to assess the value of properties for property tax purposes) in determining a model where the price of a single-family residential property in a given neighborhood can be predicted based on ..
The mean tenure (in years) was 19.6 and the standard deviation was 8.1. Find the standardized tenure score, if these 9 were a random sample.
Suppose one performed a sequence of independent Bernoulli trials (in which the probability of success at each trial is p) until the first success occurs.
data on the number of occurrences per time period and observed frequencies follow. compute the value of the test
The Probability applet can imitate random digits. Set the probability of heads in the applet to 0.1. Check "Show true probability" to show this value on the graph.
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Devise a simple coding system to do a content analysis of print advertisements in popular magazines. Begin by examining the ads to choose the content dimensions you wish to use (e.g., gender).
Explain which interpretation of probability (relative frequency or personal) applies to each of these statements and how you think the probability.
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