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Bureau of Statistics shows that the average insurance cost to a company per employee per hour is Shs.184 for managers and Shs.199 for professional workers. Suppose these figures were obtained from 14 managers and 15 professional workers and that their respective population standard deviations are Shs.38 and Shs.51. Assume that such insurance costs are normally distributed in the population. Test to determine whether there is a significant difference in the hourly rates employers pay for insurance between managers and professional workers. Use a 2% level of significance.
Recognize the kind of sampling (random, systematic, convenience, stratified, cluster) employed whenever a sample of people who smoke is obtained as explained below.
the probability of a roulette ball landing on black is approximately 47.4. find the probability that the ball lands on
A card is randomly selected from a standard deck. Find the probability that the card is between four and eight (inclusive) or is a club.
Assuming that Mendel's proportion of 3/4 is correct, find the probability of getting 787 or fewer plants with long stems among 1064 offspring plants. compare answers with binomial and normal approximation.
If one household from the survey is selected at? random, what is the probability that it will have Internet access or? cable?
Estimate a test statistic for null hypothesis H0: μ = 30 against two-sided alternative hypothesis H1 : μ ≠ 30, and by plotting this on its reference distribution.
a family managed to decrease their energy consumption from 145 kilowatt-hours to 136 kilowatts-hours. what percent of
Japan was the first Asian country to challenge the dominance of the U.S. in 1980s. However, since then, its economy has been in a slow but relentless decline
He argues that the regression effect says people who perform very poorly in their previous job tend to perform well in their next job. Is this what the regression effect says? Explain.
Is seat belt use independent of cigarette smoking? A study of seat-belt users and non-users yielded the randomly selected sample data summarized in the table below.
use the given information to find the minimum sample size required to estimate an unknown population mean micro.margin
We will test to determine if there evidence of an improvement on the final examination, at the 1% significance level. What is the alternate hypothesis?
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