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1. A random sample of 15 people using Tony Little's weight loss program produced a standard deviation of 15 pounds and a random sample of 10 people using Richard Simmons's weight loss program yielded a standard deviation of 18 pounds. Conduct a hypothesis test to determine whether the two programs differ in variability. Test at the 0.05 level of significance. 2. A statistical consulting firm claims that 40% of its clients have no idea how to solve a No Idea 23 particular statistical problem, 40% have some idea how to solve a particular statistical Some Idea 9 problem and 20% have a complete understanding of a particular statistical problem. The table at the right represents a random sample of 40 clients from this consulting firm. Complete 8 Using a =.05 , conduct a test to determine if the claims are correct. Understanding 3. Researchers have investigated whether certain types of risky Smoke Not TOTAL behaviors are related. A study reported in the American Journal of 68 175 243 Public Health is based on the data summarized in the table at the Wear seatbelts right. Conduct a test at the .05 level to determine whether smoking No seatbelts 67 149 216 and seatbelt use are independent. TOTAL 135 324 459