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Chapter 9: Q.50 (page 539)
Assume and Is this a left-tailed, right-tailed, or two-tailed test?
It is right-tailed test.
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The mean number of sick days an employee takes per year is believed to be about ten. Members of a personnel department do not believe this figure. They randomly survey eight employees. The number of sick days they took for the past year are as follows: . Let the number of sick days they took for the past year. Should the personnel team believe that the mean number is ten?
A sleeping bag is tested to withstand temperatures of. You think the bag cannot stand temperatures that low. State the Type I and Type II errors in complete sentences.
Some of the following statements refer to the null hypothesis, some to the alternate hypothesis. State the null hypothesis, , and the alternative hypothesis. Ha, in terms of the appropriate parameter .
a. The mean number of years Americans work before retiring is .
b. At most 60% of Americans vote in presidential elections.
c. The mean starting salary for San Jose State University graduates is at least per year.
d. Twenty-nine percent of high school seniors get drunk each month.
e. Fewer than of adults ride the bus to work in Los Angeles.
f. The mean number of cars a person owns in her lifetime is not more than ten.
g. About half of Americans prefer to live away from cities, given the choice.
h. Europeans have a mean paid vacation each year of six weeks.
i. The chance of developing breast cancer is under for women.
j. Private universities' mean tuition cost is more than per year.
A microbiologist is testing a water sample for E-coli. Suppose the null hypothesis, , is: the sample contains E-coli. Which is the error with the greater consequence?
A Nissan Motor Corporation advertisement read, 鈥淭he average man鈥檚 I.Q. is The average brown trout鈥檚 . So why can鈥檛 man catch brown trout?鈥� Suppose you believe that the brown trout鈥檚 mean I.Q. is greater than four. You catch brown trout. A fish psychologist determines the I.Q.s as follows: . Conduct a hypothesis test of your belief.
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