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For each of the following studies, say whether you would use a t test for dependent means or a t test for independent means.
(a) A researcher measures the heights of 40 university students who are the firstborn in their families and compares the 15 who come from large families to the 25 who come from smaller families.
(b) A researcher tests performance on a math skills test of each of 250 individuals before and after they complete a one-day seminar on managing test anxiety.
(c) A researcher compares the resting heart rate of 15 individuals who have been taking a particular drug to the resting heart rate of 48 other individuals who have not been taking the drug.
The standard deviation of test scores on a certain achievement test is 10.5. A random sample of 150 scores on this test had a mean of 72.8.
Determine the probability that exactly 8 of them started smoking before 18 years of age.
The American Bankers Association collects data on the use of credit cards, debit cards, personal checks, and cash when consumers pay for in-store purchases (The Wall Street Journal, December 16, 2003). In 1999, the following usages were reported.
Create a 95% confidence interval for true mean debt for student borrowers.
Three colors have been proposed for a product: blue, green, yellow. The null hypothesis for a goodness-of-fit test would be.
You are running a chi-squared test. You have 2 groups with 3 characteristics each, what would your critical value be with an alpha of .025?
What is the 95% confidence interval estimate of the population mean cost for a prescription of Zocor?
we wish to estimate the mean using a sample size of n = 49. Find the probability that we could be correct within 1kg/m 2 .
4 7 7 5 2 9 7 6 8 5 8 4 1 5 2 8 7 6 6 9. (a) Determine three quartiles and (b) draw box-and-whisker plot of the data.
Perform the sensitivity analysis for the COM-TECH case. Assume you are interested in following two probabilities: probability of receiving grant, and probability of high cellular R&D costs.
A national survey of restaurant employees found that 75% said work stress had a negative impact on their personal lives. A sample of 100 employees from a popular restaurant chain finds that 68 answer
Compare and contrast a Difference of Means test with a Paired Difference test. What, fundamentally, are we testing for in each? When do you use the difference of means?
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