68. In a study, Germination and Emergence of Broccoli, conducted by the Department of Horticulture at Virginia Polytechnic Institute and State University, a researcher found that at 5°C, 10 seeds out of 20 germinated, while at 15°C, 15 out of 20 seeds germinated. Compute a 95% confidence interval for the difference between the proportion of germination at the two different temperatures and decide if there is a significant difference.
70. According to USA Today (March 17, 1997), women made up 33.7 of the editorial staff at local TV stations in 1990 and 36.2% in 1994. Assume 20 new employees were hired as editorial staff.
a) Estimate the number that would have been women in each year, respectively.
b) Compute a 95% confidence interval to see if these is evidence that the proportion of women hired as editorial staff in 1994 was higher than the proportion hired in 1990.
Confidence Intervals and Significance Levels are investigated. The solution is detailed and well presented. The response received a rating of "5/5" from the student who originally posted the question.