timer Asked: Oct 30th, 2015

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10-C1. Some psychologists theorize that there is a link between personality type and body type. Body types, called somatotypes, are sorted into three general categories: ectomorphs (thin and wiry), mesomorphs (stocky and muscular), and endomorphs(on the heavy side). Further, it has been assumed that mesomorphs are typically more extraverted than either ectomorphs or endomorphs. A group of 21 children, all of whom were rated above average in mesomorphy, was selected, along with another group of 21 children who had been rated below average in mesomorphy. All the selected children were 13-year-old males. Both groups were given the EPIE test, the ” extraversion" scale taken from the Eysenck Personality Inventory. On this test, higher scores indicate a higher degree of extraversion.

The scores obtained by the mesomorphs were: 12, 13, 11, 12, 14, 10, 9, 15, 20, 4, 12, 12, 10, 14, 11, 13, 12, 13, 12, 13, 10

The scores achieved by the non-mesomorphs were: 14, 12, 10, 10, 10, 11, 7, 12, 14, 2, 11, 10, 12, 11, 10, 14, 18, 12, 11, 15, 5

a. State/write out the null hypothesis using appropriate IV and DV terminology.

b. Report Critical Value (CV) required for significance.

c. Report dfs

d. There is/is not a significant difference between the two groups. (choose one)

e.  Explain all conclusions (i.e., Do the two groups represent the same population with regard to extraversion?

f. Are the two groups equal in variability?

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