2. True. Z-Scores are for Normal Distributions only. If the population is not normal, then you
need to use some other method.
4. see attached for work
C 416 and lower
A. The normal
2a. Why do 12th grade females have poorer outcomes in math and science than 12th grade males?
Females are not expected to study as hard as males in those two subjects.
2b. Why does the African American population receive less income than the Caucasian
4a. The median is 118. Please see attached picture for my work shown.
4b. 94 is the 20th percentile and 160 is the 80th percentile. Please see attached picture for my work.
A. The mean would be the best measure of central tendency as it
SPSS Chapter 2 #1
1. 15.8 % is divorced
2. 47.8 % is married
3. I believed the population of single people is at 52.8 %. I included the widowed, divorced,
separated, and never married categories.
Chapter 2 Exercises
4a. The years of education would be mea
a. I believe this does show a random sample because everyone that submits a letter has an equal
probability of being chosen.
b. The systematic random sampling could also be used. This is because one can take everyone that wrote
a letter and divide it by
4. See attached picture for work
6a. The most at risk group of not having insurance are those in the 100-199% group. Young people are
the most likely to have insurance. Middle age (18 to 44) is the most likely to not have insurance. The
poorest of the poo