1.A newspaper reported on the topics that teenagers most want to discuss with their parents. The findings, the results of a poll, showed that 46% would like more discussion about the family's financial situation, 37% would like to talk about school, and 30% would like to talk about religion. These and other percentages were based on a national sampling of 549 teenagers. Using 99% reliability, can we say that more than 30% of all teenagers want to discuss school with their parents?

2. A large university is interested in learning about the average time it takes students to drive to campus. The university sampled 238 students and asked each to provide the amount of time they spent traveling to campus. This variable, travel time, was then used conduct a test of hypothesis. The goal was to determine if the average travel time of all the university's students differed from 20 minutes. Suppose the large-sample test statistic was calculated to be z = 2.14. Find the p-value for this test of hypothesis.

3. A company claims that 9 out of 10 doctors (i.e., 90%) recommend its brand of cough syrup to their patients. To test this claim against the alternative that the actual proportion is less than 90%, a random sample of 100 doctors was chosen which resulted in 86 who indicate that they recommend this cough syrup. What is the test statistic in this problem?

4. A company claims that 9 out of 10 doctors (i.e., 90%) recommend its brand of cough syrup to their patients. To test this claim against the alternative that the actual proportion is less than 90%, a random sample of doctors was taken. Suppose the test statistic is z = -1.95. Can we conclude that H0 should be rejected at the a) ? = .10, b) ? = .05, and c) ? = .01 level?

5. When blood levels are low at an area hospital, a call goes out to local residents to give blood. The 25) blood center is interested in determining which sex - males or females - is more likely to respond. Random, independent samples of 60 females and 100 males were each asked if they would be willing to give blood when called by a local hospital. A success is defined as a person who responds to the call and donates blood. The goal is to compare the percentage of the successes of the male and female responses. Suppose 45 of the females and 60 of the males responded that they were able to give blood. Find the test statistic that would be used if it is desired to test to determine if a difference exists between the proportion of the females and males who responds to the call to donate blood.

. We are interested in comparing the average supermarket prices of two leading colas. Our sample was taken by randomly selecting eight supermarkets and recording the price of a six-pack of each brand of cola at each supermarket. The data are shown in the following table: Price Supermarket Brand 1 OO'JOWrP-'nUON x1 = 2.3125 31 = 0.1007 Brand 2 Difference $0.05 2.42 2.40 x2 = 2.3500 d = 52 = 0.0859 sd = 0.0381 0.02 0.06 -0.02 0.10 0.00 -0.06 -0.03 -0.0375 Find a 98% condence interval for the difference in mean price of brand 1 and brand 2. A) 0.0375 1 0.1393 B) 0.0375 i 0.0404 C) 0.0375 1 0.0471 D) 0.0375 1 0.0347