PUBHLTH 7A Cal State Fullerton Statistics Questions

PUBHLTH 7A: HOMEWORK #4This assignment is due at 11 PM, on Friday of the week indicated in your syllabus. No late submissions
will be accepted for credit, but you may submit late if you want feedback. You must fully answer each
question and show your work where necessary to get credit. Please highlight your answers in yellow
or use a different font color, so I can identify your response. Make sure you save your file as a doc,
docx, or pdf. No other file types will be accepted.
Learning Objectives:

Understanding the importance of the null and research hypotheses
Differentiate between a directional and nondirectional hypotheses
Computing and interpreting z scores and understanding their importance
1. You are going to conduct a psychological study focusing on the relationship between
watching violence on television and violent behavior. Generate a null hypothesis and two
research hypotheses (nondirectional and directional) for this study. Write both the null
and research hypotheses in word form and using the appropriate Greek or Roman letters
(6 points)
2. What is wrong with this hypothesis? Will the accelerated class score higher on a reading
comprehension exam as compared with a regular class? (3 points)
3. For each research question state the null and research hypotheses, and indicate whether
the test is directional (1-sided), or non-directional (2-sided): (5 points)
1. Has the mean community level of suspended particulates for the year 2009 exceeded
40 units per cubic meter?
Null:
Research:
Circle:
Directional
or
Non-Directional
2. Does the mean age of onset of cigarette smoking differ from 13?
Null:
Research:
Circle:
Directional
or
Non-Directional
3. Is the mean weight of a sample of 75 grade school children significantly different
from the health target weight of 80 pounds?
Null:
Research:
Circle:
Directional
or
Non-Directional
4. Is the mean pulse of a sample of 40 runners lower than 75?
Null:
Research:
Circle:
Directional
or
Non-Directional
5. Does the average miles per gallon (MPG) of gasoline for a shipment of 20 hybrid cars
differ from 50 miles per gallon?
Null:
Research:
Circle:
Directional
or
Non-Directional
4. Find the area under the normal curve that lies between the given values of z. (5 points)
a. Z=0 and z=2.37
b. Z=0 and z= -1.94
c. Z=-1.85 and z=1.85
d. Z=-0.76 and z=1.13
e. Z=-2.77 and z=-0.96
5. The weights of 18–24-year-old women are normally distributed with a mean of 132
pounds and a standard deviation of 27.4. If one randomly selected 150 of these women
ages 18-24, how many of them would be expected to weight 100-150 pounds. (6 points)

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