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It was claimed that the average annual expenditures per consumer unit had continued to rise, as measured by the Consumer Price Index annual averages (Bureau of Labor Statistics report, 1995). To test this claim, 100 consumer units were randomly selected in 1995 and found to have an average annual expenditure of $32,277 with a standard deviation of $1200. Assuming that the average annual expenditure of all consumer units was $30,692 in 1994, test at the 5% signi?cance level whether the annual expenditure per consumer unit had really increased from 1994 to 1995.
weighing bean seeds. biological measurements on the same species often follow a normal distribution quite closely. the
A researcher believes that if she uses a different text the students will score differently on the standardized test but she doesn't know what the difference is. The test had a mean of 110 and a σ of 12.
find the indicated iq score. the graph to the right depicts iq score of adults and those scores are normally
Solve this problem explicitly using all five steps of hypothesis testing, and illustrate your answer with a sketch showing the comparison distribution
a random sample of size 36 is selected from a population whose mean is 30 and standard deviation is 6. calculate the
scores on a standardized test are normally distributed with a mean of 100 and a standard deviation of 12. an
Construct a 95% confidence interval for the true difference in population proportions of high LDL (p1-p2) between female and male populations.
Conduct post hoc comparisons with the LSD method. Which groups differ significantly at α = 0.05?
A railway company operates a number of different services. One of these connects two cities and the journey time is assumed to be normally distributed with a mean of 125 minutes and a standard deviation of 5 minutes.
?What is the mean of the sampling distribution of , the proportion of adults in samples of 500 who favor giving parents of school-age children these vouchers?
a man pays 400 for a 1 year life insurance with coverage of 200000.given his age he has a .995 chance of living for at
a population has a mean of 200 and a standard deviation of 50. a simple random sample of size 100 will be taken and the
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