Researchers analyzed 12 samples of two kinds of Stella's decaffeinated coffee. The caffeine in a cup of decaffeinated espresso had a mean of 9.4 mg with a standard deviation of 3.2 mg, while brewed decaffeinated coffee had a mean of 12.7 mg with a standard deviation of 0.35 mg. Assuming unequal population variances, is there a significant difference in caffeine content between these two beverages at α = .01?
Answer to relevant QuestionsA ski company in Vail owns two ski shops, one on the west side and one on the east side of Vail. Ski hat sales data (in dollars) for a random sample of 5 Saturdays during the 2004 sea- son showed the following results. Is ...Two labs produce 1280 × 1024 LCD displays. At random, records are examined for 12 independently chosen hours of production in each lab, and the number of bad pixels per thou- sand displays is recorded. (a) Assuming equal ...One group of accounting students used simulation programs, while another group received a tutorial. Scores on an exam were compared. (a) Construct a 90 percent confidence interval for the true difference in mean scores, ...Consider a one-factor ANOVA with n1 = 6, n2 = 5, n3 = 4, n4 = 6, n5 = 4. (a) How many possible comparisons of means are there? (b) State the degrees of freedom for Tukey's T. (c) Find the critical value of Tukey's T for 5 ...Refer to Exercise 11.7. Are the population variances the same for the GPAs (4 majors)? Exercise 11.7 Semester GPAs are compared for seven randomly chosen students in each class level at Oxnard University. Do the data show a ...
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