Homework #3
1)
a) Arranged from smallest standard deviation to the largest, the order of students hypothetical
test scores is: A, C, D, B. Student As scores are consistently the same, Student Cs score
Homework 4, Part 1
1.)
a.) Z = (34-34)/6
Z=0
Z = (40-34)/6
Z=1
.8413 - .5000 = .3413 is the proportion of Sunday nights when a range of 34 to 40 students
are in the room.
b.) Z = (31-34)/6
Z = -.5
Z =
Homework #5
1.)
I want to see if there is a difference in occupational prestige between two age groups: people
over 50 and people under 50.
My null hypothesis is that the average measure of occupation
Evaluating Information Notes 2
Independent and Dependent Variables
Cavities (dependent variable) and brand of toothpaste (independent variable)
The independent variable affects the dependent variable,
Evaluating Information Notes 1
-Watch a news clip from a network such as Fox or MSNBC, and you may see
that the news is a bit biased.
-We like to confirm what we already believe and deny what we do no
Evaluating Information Notes 3
Measures of Variation:
Range: the total spread of scores from the lowest to the highest observed values.
Interquartile Range: the range in the middle 50% of scores.
Stan
Evaluating Information Notes 4
The difference between sampling distribution and sample distribution.
Sampling Distribution: the distribution of a statistic (typically mean values) for all
possible sam
Evaluating Information Notes 5
Hypothesis Testing: a procedure that allows us to evaluate population parameters
based on sample statistics. Used to test if differences in a sample are likely to
exist
Homework 8
1.)
Table 1: Correlations among Number of Hours Usually Worked a Week, Income, and
Highest Year of School Completed
Number of Hours
Highest Year of School
Worked
Income
Completed
Number of