Category: Writing

A pharmaceutical company has employed researchers to
investigate the frequency of heart attacks among those who have taken their
drug regularly and those who have not. Would the manufacturer urge the
researchers to be especially careful to avoid making a Type I error or a Type
II error?

a. What would be the T score for the raw score of 46 in
Exercise 12?
b. What would the stanine score for the raw score of 46 be?
Exercise 12
The mean score on a test is 40, and the
standard deviation is 4. Express each of the
following raw scores as a z score:
a. 41
b. 30
c. 48
d. 36
e. 46

A Type II error occurs when a researcher
does which of the following?
a. Rejects a false null hypothesis
b. Rejects a true null hypothesis
c. Has already made a Type I error
d. Retains a false null hypothesis
e. Retains a true null hypothesis

The mean score on a test is 40, and the
standard deviation is 4. Express each of the
following raw scores as a z score:
a. 41
b. 30
c. 48
d. 36
e. 46

Which of the following statements
describes the role of the null hypothesis in
research?
a. It enables researchers to determine
the probability of an event occurring
through chance alone when there is no
real relationship between variables.
b. It enables researchers to prove there is a
real relationship between variables.
c. It enables researchers to prove there is
no real relationship between variables.

Inferential statistics enable researchers to
do which of the following?
a. Reach infallible conclusions
b. Reach reasonable conclusions with
incomplete information
c. Add an aura of legitimacy to what is
really sheer guesswork

Investigators wish to study the question,
“Do blondes have more fun?”
a. What is the null hypothesis in this
question?
b. What would be a Type I error in this case?
c. What would be a Type II error in this case?
d. If one investigator uses a .05 level of
signifi cance in investigating this question
and another investigator uses a .001
level of signifi cance, which would be
more likely to make a Type I error?
e. If one investigator uses a .05 level of
signifi cance in investigating this question and another
investigator uses a .001
level of signifi cance, which would be
more likely to make a Type II error?

A national magazine has 1 million subscribers. The editorial
staff wants to know
which aspects of the magazine are liked
and which are not. The staff decides that
a personal interview is the best method to
obtain the information. For practical and
economic reasons, only 500 people in fi ve
cities will be surveyed. In this situation,
identify the following:
a. The population
b. The sample

You have been asked to determine whether teachers in the
Springfi eld School District favor the “year-round school” concept. Because the
district is rather large, you are asked to contact only 500 teachers. Determine
the number you would choose from each of the following levels to draw a
proportional stratifi ed random sample: