Type:
Solution Manual
Introductory Statistics Using Resource: SPSS Edition:
2nd Edition
Author(s):
Herschel Knapp
1
Chapter 1 Research Principles Solutions to All Exercises
Exercise
Page
1.1 ..................... 2 1.2 ..................... 3 1.3 ..................... 4 1.4 ..................... 5 1.5 ..................... 6 1.6 ..................... 7 1.7 ..................... 8 1.8 ..................... 9 1.9 ................... 10 1.10 ................. 11
Knapp, Introductory Statistics Using SPSS, Second Edition. © 2017, SAGE Publications.
2 NOTE: It is not expected that your answers will match the solutions below verbatim or that your methods will be identical, but they should concur conceptually. Exercise 1.1 (a) Will 30 minutes of square dancing, 5 days a week, help reduce pediatric weight? (b) This would be a two-group study: The control group would have recess as usual with no structured activities; the kids can do whatever they want (except participate in the square dancing). The treatment group would participate in the square dancing. (c) The briefing sheet that would be distributed to teachers would instruct each teacher to go through their roll list, and flip a coin one time for each student: Heads assigns the student to the square dancing, tails assigns the student to have regular recess. (d) H0: Aerobic square dancing 30 minutes a day, 5 days a week, facilitates no weight loss among elementary school students. H1: Aerobic square dancing 30 minutes a day, 5 days a week, facilitates weight loss among elementary school students. (e) At the conclusion of the study, the school nurse will weigh each student. The statistician will compare the weights of those who participated in the aerobic square dancing against those who had regular recess. If there is no statistically significant difference between the weights of these two groups, then we would accept H 0, otherwise, we would reject H0 in favor of H1.
Knapp, Introductory Statistics Using SPSS, Second Edition. © 2017, SAGE Publications.
3 Exercise 1.2 (a) Does pet therapy for 30 minutes per day with certified therapy dogs help reduce depression among nursing home residents? (b) This nursing home has the hours of 2:00 p.m. to 4:00 p.m. daily designated as open time. Those who are in the treatment group will be taken to the patio from 2:30 p.m. to 3:00 p.m. to participate in the pet therapy program. Those in the control group will be free to utilize that 2-hour block of time any way they choose (except for pet therapy). (c) I would assign residents who were born on an even date to the control group, and those born on an odd date would be assigned to the treatment (pet therapy) group. (d) H0: Pet therapy for 30 minutes per day has no impact on nursing home residents’ level of depression. H1: Pet therapy for 30 minutes per day reduces nursing home residents’ level of depression. (e) After pet therapy, our team will ask each resident in both groups to rate their mood (1 = feeling very depressed, 10 = feeling very happy). We will process the scores; if there is no statistically significant difference between the scores of the two groups, then I would not reject H0 and reject H1. If the treatment group has a statistically significantly lower score than the control group, then I would reject H0 and not reject H1.
Knapp, Introductory Statistics Using SPSS, Second Edition. © 2017, SAGE Publications.
4 Exercise 1.3 (a) Will placing a security camera on cashiers reduce cash shortages? (b) This will be a two-group study: The control group will have no cameras installed. The treatment group will have a camera installed focused on each cashier, and all cashiers in the treatment group will be notified that their actions are now being recorded. (c) The name of each of the 10 stores will be written on a chip and placed into a bag. The bag will be sealed, shaken, and then opened; a staff member will reach into the bag and without looking, withdraw five chips. The stores indicated on these five chips will constitute the treatment group; the other five stores will constitute the control group. NOTE: Since this is a two-group design, one could have simply used the coin-flip method; the chip selection is one potential alternative to consider when there are more than two groups, as will be the case in Chapter 6 (“ANOVA and KruskalWallis Test”). (d) H0: Video recording will have no effect on cashier balances. H1: Video recording will reduce cashier losses. (e) The statistician will gather data from all 10 stores and compare cash register losses from the stores with no cameras to the stores with cameras. If there is no statistically significant difference between the cash losses of these two groups, then we would accept H0, otherwise, we would reject H0 in favor of H1.
Knapp, Introductory Statistics Using SPSS, Second Edition. © 2017, SAGE Publications.