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