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A researcher is interested in estimating the average salary of fire fighters in a large city. He wants to be 95% confident that his estimate is correct. If the standard deviation is $1050, how large a sample is needed to get the desired information and to be accurate within $200?
Complete the table and answer the following questions. Use the .05 significance level.
What percentage of the averages or medians of the sample will be greater than 140 seconds?
Calculate separate confidence intervals for the numbers of days absent for Clinic A and Clinic B, respectively.
There are 5,000,000 Adults 25+ in Mtown. An advertiser buys a schedule on Channel 45: 20 spots in early news with an average A25+ quarter hour audience of 150,000, 25 spots in daytime with an average A25+ quarter hour audience of 200,000, and 10 s..
Average of this group is 229. Population standard deviation for both groups is 6. At α = 0.01, is there difference in cholesterol levels between two groups?
The probability the second truck is available is .51, and the probability that both trucks are available is .41: What is the probability neither truck is available?
What is the value of the slope of the least squares regression line for these data? Round your answer to at least four decimal places.
Researcher expects 12 point treatment effect and plans to use two-tailed hypothesis test with u α = .05. Calculate the power of test if researcher uses a sample of n = 16 individuals.
Determine the p-value; and at 93.7% confidence, test the above hypotheses.
What is the difference between a one-tail and a two-tail test? How do we identify each? What is meant by a p-value?
The following study was developed by Economist Simon Fass. Fass surveyed a sample population of low-income households in St. Martin. The variables analyzed were monthly income per adult and choice of rental contract for housing.
Print Media Advertising (PMA) has been given a contract to market Buzz Cola via newspaper ads in a major southern newspaper. Full-page ads in the weekday editions (Monday through Saturday) cost $2000, whereas on Sunday a full-page ad costs $8000.
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