Given the following numbers show the
sum of x, the sum of x-squared, mean, median, mode, range, sample
standard deviation, and population variance. 4 5 6 6 6 7 8
Given a population with a mean of 40 and a standard deviation of 5:
Given a sample mean of 15, a sample standard deviation of 2, and a sample
size of 30, what is the 95% confidence interval (CI) around mu?
A middle-manager wonders if members of her 51-person unit use an
inordinate number of sick days. The company president tells her that the
average number of sick days for company employees is 13 days (i.e., the
population mean is 13). Her unit uses an average of 19 days with a
standard deviation of 3 (i.e., the sample mean and standard deviation are
19 and 3, respectively). Is her unit unusual?
One year later, everything has changed. The population mean is now 12.5,
and her sample of 61 employees has a mean of 11 and a standard deviation
of 2. Is her unit unusual?
Scores in group 1 are 4, 5, 5, 2
What would the degrees of freedome be if you had 3 groups of 4
people?
F
Compare Group D to the other three groups.
Group A raw data: 5 5 4 3 (total=17)
The SSbetween for this problem = 66.25 and the SSwithin = 11.50
Use the same raw data as in Problem 6. Imagine that you have decided to compute the
original comparison (D vs A,B,C), but also 4 additional comparisons that are not
orthogonal to it. Is that comparison still significant?
Make the first 2 comparisons as specified in Problem 6, but use the Scheffe method instead of
the
Bonferroni or Orthogonal Comparison method
Using the same data as in Problem 6, compute the pairwise comparisons using the Tukey
procedure.
Assume that 12 participants are assigned randomly to the cross of two between subjects
independent variables mood (positive, negative) and alcohol (0oz, 2oz). Compute the ANOVA
using the data below:
positive mood/0 oz: 2,3,2
Now imagine that a similar study had 48 participants, randomly assigned to the cross of mood
(positive, negative, neutral) and alcohol (0oz, 2oz). On which set of degrees of freedom is
each of the 3 F ratios tested?
1. Central Tendency and Dispersion
2. z-scores
-What is the percentile rank of someone with a score of 47.5?
-What percent of the distribution is between 37 and 43?
-What score cuts off the bottom 10% of the distribution?
Answers
3. Confidence interval around mu
What if the sample size were 121?
What if the sample size were 121 but the desired CI was 99%
Answers
4. 1-sample t-test Note: Dr. Ruscher no longer teaches this
test
in Psyc209/609...but you can read about it in your text
Answers
5. One-way ANOVA
Scores in group 2 are 7, 8, 7, 7
Compute the one-way between groups ANOVA, first using the heuristic
formula, then again using the raw score formula.
Answers
6. Orthogonal Comparisons
Compare Groups A and B.
What are the coefficients for the third comparison?
Group B raw data: 4 2 4 4 (total=14)
Group C raw data: 9 9 8 7 (total=33)
Group D raw data: 9 7 7 7 (total=30)
7. Bonferroni Comparisons
Answers
8. Scheffe Comparisions
Answers
9. Range Tests: Tukey and Newman-Keuls
Now, use the Newman-Keuls procedure
Answers
10. 2-way ANOVA
negative mood/0 oz: 7,7,7
positive mood/2 oz: 4,5,5
negative mood/2 oz: 8,9,8
Answers
Questions 11-20