PORTAGE LEARNING STATISTICS MODULE 4 Z
TEST 2026 EXAM SCRIPT COMPLETE
ANSWERS
◉ If the null hypothesis is rejected, the researcher can conclude that
the results: Answer: support the research hypothesis OR prove that
the research hypothesis is true (unconfirmed which is correct yet)
◉ What is a correct argument for using a two-tailed test even if
there is a clear basis for predicting a result in a given direction?
Answer: If an unexpected result comes out opposite to what is
predicted, it does not have to be ignored.
◉ The fact that probabilities are proportions means that they:
Answer: can't be lower than zero or more than one
◉ A particular nation has a human rights score of 41, which equals a
Z score of 1.3. What is the percentage of nations above this score?
(Assume a normal distribution.) Answer: 50% - 40.32% = 9.68%
◉ What Z score would a person need to be in the top 4% of his or
her class on a particular test? Assume a normal distribution.
Answer: 50% - 4% = 46%, which corresponds to a Z score of 1.75
, ◉ Carrie attained a score of 650 on the verbal section of her SAT. The
mean grade was a 500 with a standard deviation of 100. What
percentage of test takers scored below and above Carrie? Answer:
93 and 7
◉ If you were looking at a graph of a normal distribution, which of
the following would best describe it? Answer: Unimodal, roughly
symmetrical, and bell-shaped
◉ You have an aquarium full of tropical salt-water fish and you need
to know the exact salt content of the water. To test it, you take a cup
and scoop some of the water out. In statistical language, the scoop of
water is a: Answer: sample
◉ Setting the significance level at a very extreme cutoff (such as
.001) increases the chances of: Answer: a Type II error
◉ A sample is studied to see if it represents a population (called
Population 1) that is different from a known population (called
Population 2). The comparison distribution is: Answer: the same as
the distribution of Population 2
◉ You determine the characteristics of the comparison distribution
to answer which of the following questions? Answer: Given a
particular sample value, what is the probability of obtaining that
value if the null hypothesis is true?
TEST 2026 EXAM SCRIPT COMPLETE
ANSWERS
◉ If the null hypothesis is rejected, the researcher can conclude that
the results: Answer: support the research hypothesis OR prove that
the research hypothesis is true (unconfirmed which is correct yet)
◉ What is a correct argument for using a two-tailed test even if
there is a clear basis for predicting a result in a given direction?
Answer: If an unexpected result comes out opposite to what is
predicted, it does not have to be ignored.
◉ The fact that probabilities are proportions means that they:
Answer: can't be lower than zero or more than one
◉ A particular nation has a human rights score of 41, which equals a
Z score of 1.3. What is the percentage of nations above this score?
(Assume a normal distribution.) Answer: 50% - 40.32% = 9.68%
◉ What Z score would a person need to be in the top 4% of his or
her class on a particular test? Assume a normal distribution.
Answer: 50% - 4% = 46%, which corresponds to a Z score of 1.75
, ◉ Carrie attained a score of 650 on the verbal section of her SAT. The
mean grade was a 500 with a standard deviation of 100. What
percentage of test takers scored below and above Carrie? Answer:
93 and 7
◉ If you were looking at a graph of a normal distribution, which of
the following would best describe it? Answer: Unimodal, roughly
symmetrical, and bell-shaped
◉ You have an aquarium full of tropical salt-water fish and you need
to know the exact salt content of the water. To test it, you take a cup
and scoop some of the water out. In statistical language, the scoop of
water is a: Answer: sample
◉ Setting the significance level at a very extreme cutoff (such as
.001) increases the chances of: Answer: a Type II error
◉ A sample is studied to see if it represents a population (called
Population 1) that is different from a known population (called
Population 2). The comparison distribution is: Answer: the same as
the distribution of Population 2
◉ You determine the characteristics of the comparison distribution
to answer which of the following questions? Answer: Given a
particular sample value, what is the probability of obtaining that
value if the null hypothesis is true?
