PSH 202
Spring 2013
Exercise 12 - Regression
For questions requesting a numeric answer, please enter only the exact value.
Remember that negative matters for residuals and other aspects of regression, so be sure to
check if your answer is positive or nega
The following tables are grouped frequency distributions for number of hospital visits for a
sample of middle aged adult nonsmokers, former smokers, and current smokers.
Number of Hospital
Visits
0
1
2
3
4
5
6
Total
Nonsmokers
Former Smokers
Current Smoke
Exercise 5
The following correlation table was obtained from a survey of 161 9 th grade students at a particular high
school. The variables involved were:
PERPETRATOR: How often students reported that they were bullying other students.
VICTIM: How often s
PSH 202
Spring 2013
Exercise 9
PART I: Hypothesis Testing Vocab!
Imagine you are a scientist trying to prove that your new drug, Focusal, helps improve teenagers
ability to focus.
1. If you increased , one thing that also happens is:
a. Your sample size w
PSH 202
Fall 2012
Chi Square Exercise
Example 1
What matters more to hockey players, being good at hockey, or when you were born?
The following is a table of the birth month of professional hockey players in the National
Hockey League who were born in the
PSH 202 Final Exam Practice
Section I: the Logic of Hypothesis Testing
1. You run a study with a sample size of 50. If you raise the sample size to 500, which of
these effects will happen?
i. You are more likely to reject the null hypothesis
ii. Your test
PSH 202
Fall 2012
Exercise 3
The following descriptive statistics come from two tests in a graduate statistics class
(scores on both exams are out of 20)
x
Midterm
24
16.5
13.0
Final
24
14.5
14.0
s2
S
6.25
2.5
12.25
?
N
Median
1. Which statistic reveals t
PSH 202
Exercise # 4: Football Play Descriptive Statistics
The following are data from the National Football League from the years 2000 2010 (data
were obtained from www.armchairanalysis.com). The summary statistics represent the yards
gained for either R
PSH 202
Spring 2013
Exercise 8
Hypothesis Testing
Part I: Null and Alternative Hypotheses
Questions 1 4: Identify the null and alternative hypothesis for each one
1. A researcher wants to see if there is a difference between males and females in average
s
Exercise 6: Probability
I.
Define these terms (1 pt each):
1) Z-score:
2) Probability Density Histogram:
3) Relative percentages:
II.
Answer the following short-answer questions:
4) What are some of the conditions under which the central limit theorem app