A developmental psychologist would like to know whether there is a difference in

Question

A developmental psychologist would like to know whether there is a difference in
the sociability scores of children according 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?
a. Using the 5 steps of hypothesis testing, test at .05.
b. Conduct two post hoc tests, Tukey’s HSD Test and the Scheffe Test, both at
.05, and compare your answers.
No Sibling One Sibling Two Siblings
4 7 8
5 7 9
7 6 7
3 6 8
4 7 9

Explanation / Answer

A developmental psychologist would like to know whether there is a difference in

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