19.1 Managing the finances. Choose 50 engaged couples who have not been previ- ously married. Interview the man and woman separately about how their joint finances will be handled after marriage. Compare the views of men and women. 19.2 Does peer discussion promote learning? Undergraduate students in a biology class were randomly divided into two groups. In the first group, students worked alone on a multiple-choice exam on material recently covered in the class. In the second group, students worked in teams of four on the same multiple-choice exam. The teams were encouraged to discuss the questions among themselves before answering questions. All exams were graded and returned to the students. Then all students worked alone on another multiple-choice exam on the same material as the first exam. Compare the mean scores of the two groups on the second exam. 19.3 Chemical analysis. To check a new analytical method, a chemist obtains a refer- ence specimen of known concentration from the National Institute of Standards and Technology. She then makes 20 measurements of the concentration of this specimen with the new method and checks for bias by comparing the mean result with the known concentration. 19.4 Chemical analysis, continued. Another chemist is checking the same new method. He has no reference specimen, but a familiar analytic method is avail- able. He wants to know if the new and old methods agree. He takes a specimen of unknown concentration and measures the concentration 10 times with the new method and 10 times with the old method. 02 Do Qs 21.1, 21.3 &21.4 from Moore et al, p.480. (7th ed, p.486). Read the question carefully! Inference about a mean or means: circle the correct data design in each case and explain your choice. Explanation: .1 single sample OR matched pairs OR two independent samples .3 single sample OR matched pairs OR two independent samples .4 single sample OR matched pairs OR two independent samples 19.1 Managing the finances. Choose 50 engaged couples who have not been previ- ously married. Interview the man and woman separately about how their joint finances will be handled after marriage. Compare the views of men and women. 19.2 Does peer discussion promote learning? Undergraduate students in a biology class were randomly divided into two groups. In the first group, students worked alone on a multiple-choice exam on material recently covered in the class. In the second group, students worked in teams of four on the same multiple-choice exam. The teams were encouraged to discuss the questions among themselves before answering questions. All exams were graded and returned to the students. Then all students worked alone on another multiple-choice exam on the same material as the first exam. Compare the mean scores of the two groups on the second exam. 19.3 Chemical analysis. To check a new analytical method, a chemist obtains a refer- ence specimen of known concentration from the National Institute of Standards and Technology. She then makes 20 measurements of the concentration of this specimen with the new method and checks for bias by comparing the mean result with the known concentration. 19.4 Chemical analysis, continued. Another chemist is checking the same new method. He has no reference specimen, but a familiar analytic method is avail- able. He wants to know if the new and old methods agree. He takes a specimen of unknown concentration and measures the concentration 10 times with the new method and 10 times with the old method. 02 Do Qs 21.1, 21.3 &21.4 from Moore et al, p.480. (7th ed, p.486). Read the question carefully! Inference about a mean or means: circle the correct data design in each case and explain your choice. Explanation: .1 single sample OR matched pairs OR two independent samples .3 single sample OR matched pairs OR two independent samples .4 single sample OR matched pairs OR two independent samples
