8. A study of the number of business lunches that executives claim as expenses per month gives the following results: Sixty bank executives average 8.4 such deductions with a standard deviation of 1.8 while fifty insurance executives average 9.6 deductions with a standard deviation of 2.1 .Test the claim that bank executives have fewer deductions per month, on average, than insurance executives using a = 0.005. 9. Pathological gambling is an impulse-control disorder. The National Gambling Impact Study Commission randomly selected 2417 adults and found that 35 were pathological gamblers. Is there evidence to conclude that more than 1% of the adult population are pathological gamblers as claimed by the American Psychiatric Association? Use a = 0.01 to test the claim. 10. An internet service provider claimed that its users averaged 13 hours per week. To test this claim, a competitor conducted a survey of 240 customers and found that the average time spent online was 12.5 hours per week with a standard deviation of 5.2 hours ner week. Test the claim using N = 0.05