Portage Learning Statistics
Module 4 The Z-Test (Latest
2026/2027 Update) Complete
Questions and Guide Answers,
100% Verified Graded A+
A frequency distribution that follows a bell-shaped, symmetrical, unimodal
curve is known as the
normal curve
In a normal distribution, the mean is located in the
middle of the curve
In a normal distribution, what is the relationship between the mean, median,
and mode?
Mean~=Median~=Mode
Mean = Median
The further a value deviates from the mean, the ___ the frequency, thus scores
beyond 2 stand deviations from the mean rarely occur in normal distribution
the lower the frequency
Data with __ frequencies are clustered around the mean
, the greatest
A distribution with a smaller standard deviation has a curve with a ___
higher arc
A distribution with a larger standard deviation has a curve with a __
lower arc
A normal distribution can be defined by its
mean and standard deviation
The area under the curve represents the total relative frequency of a
distribution and equals __
100%
In a normal curve, an equal number of distributions fall
above and below the mean
Normal distributions are approximated with the __ rule
68-95-99.7
About __ values fall within 1 SD of the mean
About __ values fall within 2 SD of the mean
About __ values fall within 3 SD of the mean
68-95-99.7
Calculate the 68-95-99.7 totals with a mean = 73 and standard deviation (sigma)
=4
68% between 69-77
95% between 65-81
99.7% between 61-85
True/false: 68-95-99.7 rule only works when values are exactly 1, 2 or 3 standard
deviations away from the mean.
Module 4 The Z-Test (Latest
2026/2027 Update) Complete
Questions and Guide Answers,
100% Verified Graded A+
A frequency distribution that follows a bell-shaped, symmetrical, unimodal
curve is known as the
normal curve
In a normal distribution, the mean is located in the
middle of the curve
In a normal distribution, what is the relationship between the mean, median,
and mode?
Mean~=Median~=Mode
Mean = Median
The further a value deviates from the mean, the ___ the frequency, thus scores
beyond 2 stand deviations from the mean rarely occur in normal distribution
the lower the frequency
Data with __ frequencies are clustered around the mean
, the greatest
A distribution with a smaller standard deviation has a curve with a ___
higher arc
A distribution with a larger standard deviation has a curve with a __
lower arc
A normal distribution can be defined by its
mean and standard deviation
The area under the curve represents the total relative frequency of a
distribution and equals __
100%
In a normal curve, an equal number of distributions fall
above and below the mean
Normal distributions are approximated with the __ rule
68-95-99.7
About __ values fall within 1 SD of the mean
About __ values fall within 2 SD of the mean
About __ values fall within 3 SD of the mean
68-95-99.7
Calculate the 68-95-99.7 totals with a mean = 73 and standard deviation (sigma)
=4
68% between 69-77
95% between 65-81
99.7% between 61-85
True/false: 68-95-99.7 rule only works when values are exactly 1, 2 or 3 standard
deviations away from the mean.
