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Reconsider the previous problem about the age of a college students mother when the student was born. Now suppose you want to conduct a significance test of whether the sample data provide strong evidence that the population mean of mothers age is less than 30 years.
(a) State the appropriate null and alternative hypotheses in symbols.
(b) Calculate the test statistic.
(c) Determine (as accurately as possible) the p-value of the test.
(d) State your test decision at the α = .10 significance level.
(e) Summarize your conclusion in context, and explain the reasoning process by which you reached this conclusion.
Calculate separately for 1983 and 1987, the 95% confidence interval for the proportion of students who had driven an automobile while drinking.
Inspection of student data generated during pre/post treatment surveys shows that among 10 subjects, 7 had higher scores after an experimental treatment
question the haemoglobin a testa blood test given to diabetics during their periodic check-upsindicate the level of
In doing so, you collect a random sample of 50 salespersons employed by his company, which is thought to be representative of sales staffs of competing organizations in the industry. The collected random sample of size 50 showed that only 18 were ..
Average (arithmetic mean) of 15 years with a standard deviation of 4 years. How does the relative dispersion in the distribution of salaries compare with that of the lengths of service?
Illustrate that probability distribution of X satisfies properties of a discrete probability distribution.
Why is statistical significance not necessarily of practical important difference to a business decision? Give an example and explain.
An urn contains 8 balls identical in every respect except color. There are 4 blue balls, 3 red balls, and 1 white ball.
A random sample of size 15 taken from a normally distributed population revealed a sample mean of 75 and a sample variance of 25. The upper limit of a 95% confidence interval for the population mean would equal?
consumer reports provided extensive testing and ratings for more than 100 hdtvs. an overall score based primarily on
Set up a hypothesis test. Is Charmers' truthful? Describe by working through hypothesis test.
Do the data indicate that the lengths of one supplier's 2x4's are subject to more variability than those of the other supplier? Assume α = 0.05. (HINT: F Test for Differences in Two Variances)
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