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Consider the accompanying 2 x 3 table displaying the sample proportions that fell in the various combinations of categories (e.g., 13% of those in the sample were in the first category of both factors
a. Suppose the sample consisted of n = 100 people. Use the chi-squared test for independence with significance level .10
b. Repeat part (a), assuming that the sample size was n = 1000.
c. What is the smallest sample size n for which these observed proportions would result in rejection of the independence hypothesis?
suppose that you wanted to determine if the males in your sales force differed from the females in your sales force in
Find the most recent weights for the Consumer Prices Index.a. Compare with those given for the Year 2005 (Table 8.14).
What is the probability Alice gets done first? What is the expected amount of time until Alice and Betty are both done?
Do the six measurements present sufficient evidence to indicate that the average weight of the diamonds produced by the new process is in excess of 0.5 karat?
Determine the least squares estimators γ and δ for this second model associated to corresponding LS estimators α and β of first model?
The Penguin Company employs 200 men and 50 women. Of the male employees, 140 work in the plant, 20 are in the office, and 40 are field salesmen.
What value is standard deviation for this data? What type of probability is this?
If you had a sample size of 50 and did not know the standard deviation of the population, would you use a t or a z statistics in your analysis? Why?
warren county telephone company claims in its annual report that the typical customer spends 60 per month on local and
Time spent using e-mail per session is normally distributed, with μ = 8 minutes, and σ = 2 minutes. If you select a random sample of 25 sessions,
a researcher randomly selects 6 fathers who have adult sons and records the fathers and sons heights to obtain the data
Correlation and Regression
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