 ×

# NYU - CAS 10 - Statistics for the Behavioral Sciences Exam 2 Study

### Created by: Brianda Hickey Elite Notetaker

Schools > NYU School of Medicine > OTHER > CAS 10 > NYU - CAS 10 - Statistics for the Behavioral Sciences Exam 2 Study

NYU - CAS 10 - Statistics for the Behavioral Sciences Exam 2 Study

##### Description: These set of notes contains a study guide and set of practice problems for the second exam of the course.
0 5 3 61 Reviews
This preview shows pages 1 - 6 of a 36 page document. to view the rest of the content Statistics for the Behavioral Science Exam 1   Practice Problems   Chapter 5  Section A:  1. 1a. If the calculated z for an experiment equals 1.35, what is the corresponding one-tailed p
value? The two-tailed p value?
b. Find the one- and two-tailed p values corresponding to z = −.7.   c. Find one- and two-tailed p values for z = 2.2.                2. a 1 . If alpha were set to the unusual value of .08, what would be the magnitude of the critical  for a one-tailed test? What would be the values for a two-tailed test?    b. Find the one- and two-tailed critical z values for α = .03.    c. Find one- and two-tailed z values for α = .007. 4. a 1 . As alpha is made smaller (e.g., .01 instead of .05), what happens to the size of the critical  z?    b. As the calculated z gets larger, what happens to the corresponding p value?                    5. An English professor suspects that her cur- rent class of 36 students is unusually good at
verbal skills. She looks up the verbal SAT score for each student and is pleased to find that the
mean for the class is 540. Assuming that the general population of students has a mean verbal
SAT score of 500 with a standard deviation of 100, what is the two-tailed p value corresponding
to this class? Section B:   2.  Can repressed anger lead to higher blood pressure? In a hypothetical study, 16 college
students with very high repressed anger scores (derived from a series of questionnaires taken in
an introductory psychology class) are called in to have their blood pressure measured. The mean
systolic blood pressure for this sample (X) is 124 mmHg. (Millimeters of mercury is the standard
unit for measuring blood pressure.) If the mean systolic blood pressure for the population is 120
with a standard deviation of 10, can you conclude that repressed anger is associated with higher
blood pressure? Use alpha = .05, two-tailed. 4. A psychologist has measured the IQ for a group of 30 children, now in the third grade, who
had been regularly exposed to a new interactive, computerized teaching device. The mean IQ for
these children is X = 106.
a. Test the null hypothesis that these children are no different from the general population of
third-graders (μ = 100, σ =  16) using alpha = .05.
b. Test the same hypothesis using alpha =  .01. What happens to your chances of attaining
statistical significance as alpha becomes smaller (all else being equal)? 5. Referring to Exercise 4, imagine that you have read about a similar study of IQs of third-
graders in which the same sample mean (106) was obtained, but the z score reported was 3.0.
Unfortunately, the article neglected to report the number of participants that were measured for
this study. Use the information just given to deter- mine the sample size that must have been
used.
6. The following are verbal SAT scores of hypothetical students who were forced to take the test
under adverse conditions (e.g., construction noises, room too warm, etc.): 510, 550, 410, 530,
480, 500, 390, 420, 440. Do these scores suggest that the adverse conditions really made a
difference (at the .05 level)? Report your p value. Advanced Exercises:    12. In the last few years, an organization has conducted 200 clinical trials to test the
effectiveness of antianxiety drugs. Suppose, however, that all of those drugs were obtained from
the same fraudulent supplier which was later revealed to have been sending only inert substances
(e.g., distilled water, sugar pills) instead of real drugs. If alpha = 0.05 was used for all hypothesis
tests, how many of these 200 experiments would you expect to yield significant results? How
many Type I errors would you expect? How many Type II errors would you expect?

This is the end of the preview. Please to view the rest of the content Join more than 18,000+ college students at NYU School of Medicine who use StudySoup to get ahead
36 Pages 110 Views 88 Unlocks
• Notes, Study Guides, Flashcards + More! Join more than 18,000+ college students at NYU School of Medicine who use StudySoup to get ahead