Question

In: Math

A developmental psychologist would like to know whether there is a difference in the sociability scores...

A developmental psychologist would like to know whether there is a difference in the sociability scores of children according to the number of siblings they have. He chose three random samples of n = 5 children each according to three groups and measured their level of sociability using a standardized test. The scores are shown in the table below. Do the scores indicate significant differences among the three groups?

No Sibling**

x^2

SS1

One Sibling**

x^2

SS2

Two Siblings**

x^2

SS3

4

16

0.36

7

49

0.16

8

64

0.04

5

25

0.16

7

49

0.16

9

81

0.64

7

49

5.76

6

36

0.36

7

49

1.44

3

9

2.56

6

36

0.36

8

64

0.04

4

16

0.36

7

49

0.16

9

81

0.64

23

115

9.2

33

219

1.2

41

339

2.8

a. Using the 5 steps of hypothesis testing, test at α .05. (15 pts)

b. Conduct two post hoc tests, Tukey’s HSD Test and the Scheffe Test, both at α .05, and compare your answers. (9 pts)

Need help with the ten step by hand ANOVA ... specifically the sum of squres/between/within calculations in the hypothesis testing

and the steps associated with the post hoc tests

Thank you!!

Solutions

Expert Solution

milcah answered 1 year ago
Next > < Previous

Related Solutions

You would like to know whether there is a difference between the rate of cooling of...
You would like to know whether there is a difference between the rate of cooling of freshly killed corpses versus those that were reheated (to determine if you could fool a coroner about time of death). You tested several rats for their cooling constant, both when the rat was freshly killed and after the same rat was reheated. Assuming the distribution ofn differences is normal, is there any difference in the cooling constants between freshly killed and reheated rats? Test...
A developmental psychologist wanted to know whether watching videos aimed at increasing the cognitive abilities of...
A developmental psychologist wanted to know whether watching videos aimed at increasing the cognitive abilities of toddlers (e.g., Baby Einstein) really helped.  He recruited 30 families from the local community with a child from 18 months to 24 months in the home.    Parents in the experimental group were instructed to have their toddler watch the video for 10 minutes per day for 4 weeks.   Parents in the control condition spent the same amount of time playing with their toddlers.    The psychologist was also interested...
A psychologist would like to determine whether there is a relation between depression and aging. It...
A psychologist would like to determine whether there is a relation between depression and aging. It is known that the general population averages μ = 40 on a standardized depression test. The psychologist obtains a sample of n = 9 individuals who are all more than 70 years old. The depression scores for this sample are as follows. 50, 47, 41, 49, 44, 42, 43, 47, 48 On the basis of this sample, can the psychologist conclude that depression for...
1. A psychologist would like to estimate the average IQ of Canadians. (IQ scores are known...
1. A psychologist would like to estimate the average IQ of Canadians. (IQ scores are known to follow a normal distribution with standard deviation 15.) She takes a sample of 49 Canadians and measures a sample mean IQ of 107.34 and a sample standard deviation of 17.36. (a) Use the information above to calculate a 92% confidence interval to estimate the average IQ of Canadians. (b) Interpret the confidence interval obtained in part (a). (c) Suppose the researcher also wishes...
Please show steps An Educational Psychologist would like to know the relationship between the number of...
Please show steps An Educational Psychologist would like to know the relationship between the number of hours per week that students study for a course and their performance in the test. a) Compute the Pearson correlation of the data below b) Determine the significance of the correlation at α .05, two-tailed by referring to Table B.6 in the Appendix of your textbook. State whether the correlation is significant. c) Confirm the Pearson correlation by ranking the number of hours of...
A psychologist would like to determine whether there is any consistent relationship between intelligence and creativity.  The...
A psychologist would like to determine whether there is any consistent relationship between intelligence and creativity.  The psychologist obtains a random sample of n = 18 people and administers a standardized IQ test and a creativity test to each individual.  Using these data, the psychologist obtains a Pearson correlation of r = +.20 between IQ and creativity. a.  Do the sample data provide sufficient evidence to conclude that a real (non-zero)      correlation exists in the population?  Test at the .05 level of significance. b.  If...
A developmental psychologist who wanted to know if children who started walking earlier performed better in...
A developmental psychologist who wanted to know if children who started walking earlier performed better in school divided 30 children into Early, Middle, and Late Walkers. At the end of the second grade, the psychologist computed a composite performance score based on teachers' reports and found no overall difference between the groups: Early M = 2.94 (SD = .61); Middle M = 2.84 (SD = .70); Late M = 2.77 (SD = .64); F (2, 27) = .86, p =...
A developmental psychologist who wanted to know if children who started walking earlier performed better in...
A developmental psychologist who wanted to know if children who started walking earlier performed better in school divided 30 children into Early, Middle, and Late Walkers. At the end of the second grade, the psychologist computed a composite performance score based on teachers' reports and found no overall difference between the groups: Early M = 2.94 (SD = .61); Middle M = 2.84 (SD = .70); Late M = 2.77 (SD = .64); F (2, 27) = .86, p =...
A psychologist is interested in testing whether there is a difference in the distribution of personality...
A psychologist is interested in testing whether there is a difference in the distribution of personality types for business majors and social science majors. The results of the study are shown in the table below. Conduct a test of homogeneity. Test at a 5% level of significance. Open Conscientious Extrovert Agreeable Neurotic Business 40 52 48 63 56 Social Science 71 74 61 80 63 What is the test statistic? (Round your answer to two decimal places.) Part (f) What...
A research psychologist wishes to investigate the difference in maze test scores for a strain of...
A research psychologist wishes to investigate the difference in maze test scores for a strain of laboratory mice trained under different laboratory conditions. The experiment is conducted using eighteen randomly selected mice of this strain, with six receiving no treatment at all (control group), six trained under condition 1, and six trained under condition 2. Then each of the mice is given a test score between 0 and 100, depending on its performance in a test maze. The experiment produced...
ADVERTISEMENT
Subjects
ADVERTISEMENT
Latest Questions
ADVERTISEMENT