Transcript Final Review

Final Review
PSYB07
1. Dr. Mary Story, an instructor in English Literature, suspects that 75% of her students prefer to
write multiple-choice examinations rather than write essay examinations. To test her suspicion,
she polled the 150 students in her class. Of the 150, 80 preferred to write a multiple-choice
examination. Did this poll support her suspicions? The following years, Dr. Story again polled her
class. Of the 140 students in the class, 120 preferred to write a multiple-choice examination. Did
these new data support her suspicions? How do you explain the above two results?
2. Explain the additive and multiplicative laws of probability.
3.If Joe Gambler flipped a dodgy coin (the probability of a head is .7) 1000 times, what would are
the expected values of the mean and standard deviation of the distribution?
4. How many questions on a true /false quiz would a student need to answer corrrectly before we
could be certain (95%) that she is not simply guessing?
5.Define Type-I and Type-II errors? What are there sources?
6. Given an between-subject analysis of variance with MS(treat) of 15, a sums-of-squares total of
100, a sums-of-squares error of 70, df(total) of 14, what was the observed F value and was it
significant?
7. Given the following pairs of x and y scores, are the y scores independent of the x scores and
what is the relation between them? What percentage of the variance in the y scores is accounted
for by the x scores?
X
1
10
3
6
4
5
7
8
9
2
y
3
7
2
8
6
5
9
10
4
1
8. Dr. Ives Forget studied the effects of encoding strategies on recall. To do so, he randomly
assigned 15 subjects to one of three groups (5 in each) and gave them each a different encoding
strategy to use during the study phase of the experiment. He hypothesized that the performance of
those subjects using strategies #1 and #2 would be no different from each other, but that those
using encoding strategy #3 would be superior to both of the others. Do the below datas support
his hypothesis? (The scores represent the number of items correctly recalled.)
Strategy #1
9
8
4
13
14
Strategy #2
10
11
3
13
14
Strategy #3
12
12
6
17
16
9. If the above data was treat as a within-subject design (repeated measures) with each row
representing a single subject (5 subjects in total), how would that change the results? Why does it
change the results?