Portage Learning Statistics Module 4 The Z-Test
Questions And Answers With Complete Solutions |
New Update 2025
A frequency distribution that follows a bell-shaped, symmetrical, unimodal curve
is known as the - ANSWER normal curve
In a normal distribution, the mean is located in the - ANSWER middle of the
curve
In a normal distribution, what is the relationship between the mean, median, and
mode? - ANSWER 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 -
ANSWER the lower the frequency
Data with __ frequencies are clustered around the mean - ANSWER the
greatest
A distribution with a smaller standard deviation has a curve with a ___ -
ANSWER higher arc
A distribution with a larger standard deviation has a curve with a __ - ANSWER
lower arc
, A normal distribution can be defined by its - ANSWER mean and standard
deviation
The area under the curve represents the total relative frequency of a distribution
and equals __ - ANSWER 100%
In a normal curve, an equal number of distributions fall - ANSWER above and
below the mean
Normal distributions are approximated with the __ rule - ANSWER 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 - ANSWER 68-95-99.7
Calculate the 68-95-99.7 totals with a mean = 73 and standard deviation (sigma) =
4 - ANSWER 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. - ANSWER True
In order to apply the concept of proportions to fractioned sigma values, the scores
or values in the dataset must be standardized.
Questions And Answers With Complete Solutions |
New Update 2025
A frequency distribution that follows a bell-shaped, symmetrical, unimodal curve
is known as the - ANSWER normal curve
In a normal distribution, the mean is located in the - ANSWER middle of the
curve
In a normal distribution, what is the relationship between the mean, median, and
mode? - ANSWER 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 -
ANSWER the lower the frequency
Data with __ frequencies are clustered around the mean - ANSWER the
greatest
A distribution with a smaller standard deviation has a curve with a ___ -
ANSWER higher arc
A distribution with a larger standard deviation has a curve with a __ - ANSWER
lower arc
, A normal distribution can be defined by its - ANSWER mean and standard
deviation
The area under the curve represents the total relative frequency of a distribution
and equals __ - ANSWER 100%
In a normal curve, an equal number of distributions fall - ANSWER above and
below the mean
Normal distributions are approximated with the __ rule - ANSWER 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 - ANSWER 68-95-99.7
Calculate the 68-95-99.7 totals with a mean = 73 and standard deviation (sigma) =
4 - ANSWER 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. - ANSWER True
In order to apply the concept of proportions to fractioned sigma values, the scores
or values in the dataset must be standardized.
