# Question 1&2 do not require SPSS Question 1, pg. 392 of Ch. 14. Note, just follo

Question 1&2 do not require SPSS
Question 1, pg. 392 of Ch. 14. Note, just follo

Question 1&2 do not require SPSS
Question 1, pg. 392 of Ch. 14. Note, just follow the 5 steps of hypothesis testing. Do NOT compute effect size.
The Acme Nut and Bolt Company wishes to buy a new machine that makes screws. Three such machines are on the market, and all are about equally priced, so Acme decides to determine whether the rate of defective screws differs from machine to machine. It makes ten trial runs on each of the three machines; each trial run involves the production of 1000 screws. The product engi-neers inspect each batch, counting the number of defective screws in each batch. The numbers are shown in the table. Is there a difference in the qual-ity of the three screw machines?
Question 2 of Ch. 14, pg. 393. Go through the 5 steps of hypothesis testing. Do NOT compute effect size.
A woman decides to take seriously the claim that some shampoos will give hair more body. She buys five dif ferent shampoos and uses a different one each day. Each day, she randomly chooses six coworkers and asks them to rate her hair on a 10-point scale (10 being high). The ratings are shown in the table. Does kind of shampoo make a difference?
Questions 3 and 4 must use SPSS
Question 3:
Dataset: MSSB_intersubjective&challengingplay_analyses.sav
Things to know:
Children were divided into 3 groups based on their ages, as follows: Group 1 = 4.00 to 4.5 years old, Group 2 = 4.51 to 4.9 years old, Group 3 = above 4.90 years old.
Research Question: Is there a difference in fathers’ intersubjective play between the three age groups of children?
a) Write BOTH the null and alternative hypotheses in narrative form (plain English).
b) What statistical test is appropriate to test this hypothesis? Explain why.
c) Run the appropriate statistical test to determine the overall difference in fathers’ intersubjective play between the three age groups of children. Note, you will need to select the variable Age_Group as your Factor, and DadIntersubjectivity as your Dependent variable.
d) Using a significance level of 0.05, decide whether to reject or fail to reject the overall null hypothesis.
e) Given your decision in (d), should we run a post-hoc (follow-up) test or not? Why or why not?
f) If you decide that we need to run a post-hoc test, select the Tukey HSD, and conduct a post-hoc analysis.
g) Using a significance level of 0.05, determine which age groups are significantly different from each other (e.g., is Group 1 different from Group 2; is Group 1 different from Group 3; is Group 2 different from Group 3?).
h) Explain your results in plain English.
Question 4:
Research Question: Is there a difference in fathers’ challenging play between the three age groups of children.
a) Write BOTH the null and alternative hypotheses in narrative form (plain English).
b) What statistical test is appropriate to test this hypothesis? Explain why.
c) Run the appropriate statistical test to determine the overall difference in fathers’ challenging play between the three age groups of children.
d) Using a significance level of 0.05, decide whether to reject or fail to reject the overall null hypothesis.
e) Given your decision in (d), should we run a post-hoc (follow-up) test or not? Why or why not?
f) If you decide that we need to run a post-hoc test, select the Tukey HSD, and conduct a post-hoc analysis.
g) Using a significance level of 0.05, determine which age groups are significantly different from each other.
h) Explain your results in plain English.