Exam 13: Testing Hypotheses About Means

A random sample of 12 bags of barbecue potato chips is collected and the price of each determined. The mean was $1.03 with a standard deviation of 7 cent ($0.07). Using $\alpha$ = 0.10, we wish to test H₀: $\mu$ = $1.00. The result is significant

Use the following information for questions: An airport official wants to assess if the flights from one airline (Airline 1) are less delayed than flights from another airline (Airline 2). Let $µ_1$ = average delay for Airline 1 and $µ_2$ = average delay for Airline 2. A random sample of 10 flights for Airline 1 shows an average of 9.5 minutes delay with a standard deviation of 3 minutes. A random sample of 10 flights for Airline 2 shows an average of 12.63 minutes delay with a standard deviation of 3 minutes. Assume delay times are normally distributed, but do not assume the population variances are equal. Use the conservative "by hand" estimate for the degrees of freedom. -What is the p-value?

Use the following information for questions: A sample of passengers flying on small planes gave a mean total weight (passenger weight including shoes, clothes, and carry-on) of 200 pounds and a standard deviation of 60 pounds. -What is the estimated effect size for comparing this result to the FDA guideline level of 185 pounds?

Suppose that a difference between two groups is examined. In the language of statistics, the alternative hypothesis is a statement that there is __________

Use the following information for questions: Cholesterol measurements for a sample of males following a new diet plan gave a mean of 208 and a standard deviation of 10. -Based on Cohen's interpretation, this effect is

Use the following information for questions: In the survey of a random sample of students at a university, two questions were "How many hours per week do you usually study?" and "Have you smoked marijuana in the past six months?" An analysis of the results produced the following Minitab output: -What is the appropriate alternative hypothesis for this question?