PORTAGE LEARNING STATISTICS MODULE 4 Z
TEST 2026 PRACTICE SET SOLVED QUESTIONS
◉ If the mean score on a stress scale is 5, the standard deviation is 2,
and the distribution is normal, what would be the mean value when
converted to a Z distribution?
a) 0
b) 2
c) 5
d) not enough information to make a determination. Answer: 0
The mean on a normal distribution always has a Z score of 0
◉ A sample's representativeness is
a) more important to psychologists who are interested in
relationships between variables
b) more important to sociologists who are interested in a
population's mean and variance
c) equally important for both psychologists and sociologists
d) not at all important for either psychologists or sociologists.
Answer: More important to sociologists who are interested in a
population's mean and variance
,◉ If the mean score on a creativity test is 20, the standard deviation
is 5, and the distribution is normal, the percentage of people who
would obtain scores between 15 and 25 is
a) 34%
b) 14% + 34% = 48%
c) 50%
d) 34% + 34% = 68%. Answer: 34% + 34% = 68%
◉ Using a normal curve table, the percentage of scores between a Z
score of 1.29 and a Z score of 1.49 is
a) 0.54%
b) 3.04%
c) 7.49%
d) 83.34%. Answer: 3.04%
1.49 % to mean is 43.19
1.29 % to mean is 40.15
Subtract to find what's in the middle
◉ The symbol used to indicate a population parameter is usually
a) a greek letter
b) an ordinary letter with a tilde mark (~) or hat mark (^)
, c) a hebrew letter
d) an ordinary letter with a bar over it. Answer: A greek letter (little
u with weird swish on side)
◉ The probability rule that applies when two mutually exclusive
outcomes are possible is the
a) addition rule
b) subtraction rule
c) multiplication rule
d) division rule. Answer: Addition rule
◉ If an organizational psychologist conducts extensive interviews
with 40 workers at a large factory to examine the morale among
workers in general at that factory, the population is
a) the 40 workers interviewed
b) all the workers in the factory except the 40 interviewed
c) all the workers in the factory
d) all the workers necessary to create a normal distribution. Answer:
All the workers in the factory. The 40 interviewed are just the
sample.
◉ If a student wants to study alcohol use at a high school obtains a
complete list of the students and has a blindfolded person select as
many people as needed for the study, the student is conducting
TEST 2026 PRACTICE SET SOLVED QUESTIONS
◉ If the mean score on a stress scale is 5, the standard deviation is 2,
and the distribution is normal, what would be the mean value when
converted to a Z distribution?
a) 0
b) 2
c) 5
d) not enough information to make a determination. Answer: 0
The mean on a normal distribution always has a Z score of 0
◉ A sample's representativeness is
a) more important to psychologists who are interested in
relationships between variables
b) more important to sociologists who are interested in a
population's mean and variance
c) equally important for both psychologists and sociologists
d) not at all important for either psychologists or sociologists.
Answer: More important to sociologists who are interested in a
population's mean and variance
,◉ If the mean score on a creativity test is 20, the standard deviation
is 5, and the distribution is normal, the percentage of people who
would obtain scores between 15 and 25 is
a) 34%
b) 14% + 34% = 48%
c) 50%
d) 34% + 34% = 68%. Answer: 34% + 34% = 68%
◉ Using a normal curve table, the percentage of scores between a Z
score of 1.29 and a Z score of 1.49 is
a) 0.54%
b) 3.04%
c) 7.49%
d) 83.34%. Answer: 3.04%
1.49 % to mean is 43.19
1.29 % to mean is 40.15
Subtract to find what's in the middle
◉ The symbol used to indicate a population parameter is usually
a) a greek letter
b) an ordinary letter with a tilde mark (~) or hat mark (^)
, c) a hebrew letter
d) an ordinary letter with a bar over it. Answer: A greek letter (little
u with weird swish on side)
◉ The probability rule that applies when two mutually exclusive
outcomes are possible is the
a) addition rule
b) subtraction rule
c) multiplication rule
d) division rule. Answer: Addition rule
◉ If an organizational psychologist conducts extensive interviews
with 40 workers at a large factory to examine the morale among
workers in general at that factory, the population is
a) the 40 workers interviewed
b) all the workers in the factory except the 40 interviewed
c) all the workers in the factory
d) all the workers necessary to create a normal distribution. Answer:
All the workers in the factory. The 40 interviewed are just the
sample.
◉ If a student wants to study alcohol use at a high school obtains a
complete list of the students and has a blindfolded person select as
many people as needed for the study, the student is conducting
