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Chapter 9: Q. 9.1 (page 507)
A medical trial is conducted to test whether or not a new medicine reduces cholesterol by.State the null and alternative hypotheses.
Null hypothesis is
Alternative hypothesis is.
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Previously, an organization reported that teenagers spent hours per week, on average, on the phone. The organization thinks that, currently, the mean is higher. Fifteen randomly chosen teenagers were asked how many hours per week they spend on the phone. The sample mean was hours with a sample standard deviation of . Conduct a hypothesis test.
At a significance level of , what is the correct conclusion?
a. There is enough evidence to conclude that the mean number of hours is more than
b. There is enough evidence to conclude that the mean number of hours is more than 4.5
c. There is not enough evidence to conclude that the mean number of hours is more than 4.5
d. There is not enough evidence to conclude that the mean number of hours is more than 4.75
Instructions: For the following ten exercises,
Hypothesis testing: For the following ten exercises, answer each question.
a. State the null and alternate hypothesis.
b. State the p-value.
c. State alpha.
d. What is your decision?
e. Write a conclusion.
f. Answer any other questions asked in the problem
Assume and Is this a left-tailed, right-tailed, or two-tailed test?
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.
It is believed that a stock price for a particular company will grow at a rate of per week with a standard deviation of. An investor believes the stock won鈥檛 grow as quickly. The changes in stock price are recorded for ten weeks and are as follows: ,,, , ,, ,,, . Perform a hypothesis test using a level of significance. State the null and alternative hypotheses, find the -value, state your conclusion, and identify the Type and Type errors.
According to the N.Y. Times Almanac the mean family size in the U.S. is . A sample of a college math class resulted in the following family sizes:
At level, is the class鈥� mean family size greater than the national average? Does the Almanac result remain valid? Why?
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