HCD 300 QUESTIONS WITH VERIFIED ANSWERS 2026
range - Answers - Subtracting the lowest value of a data set from the highest value of a
data set results in this measure.
mean - Answers - This is value is obtained by: ∑X/n
Vaiance - Answers - The standard deviation squared.
standard deviation - Answers - The average variation from the mean.
obtain an unbiased estimate - Answers - The reason we use n-1 in the denominator of
the standard deviation formula.
reliable, valid - Answers - In terms of validity and reliability, a test must first be ______
before it can be _______.
parallel forms reliability - Answers - Using two different tests or tools (such as elastic or
string) to make an observation is an example of this.
content validity - Answers - To establish this we ask experts to determine if the test
items reflect the universe of items in the topic being measured
interrater reliability - Answers - We use reliability coefficients (# of agreements / # of
possible agreements) to determine whether two individuals have similar judgments
using a particular tool.
The IQR (interquartile range) represents this percentage of the distribution. - Answers -
50%
Line Chart - Answers - This visualization can best display data over time.
histogram or scatterplot - Answers - Interval or ratio data that are continuous are
displayed with these.
bar graph or pie chart - Answers - Frequencies, proportions or categorical data are
represented with these.
A scatterplot can display the ____ between two variables. - Answers - correlation
The four types of measurement scales - Answers - nominal, ordinal, ratio, and interval
ratio data - Answers - This is the most precise type of measurement; and can make
absolute comparisons. Weight is an example.
range - Answers - Subtracting the lowest value of a data set from the highest value of a
data set results in this measure.
mean - Answers - This is value is obtained by: ∑X/n
Vaiance - Answers - The standard deviation squared.
standard deviation - Answers - The average variation from the mean.
obtain an unbiased estimate - Answers - The reason we use n-1 in the denominator of
the standard deviation formula.
reliable, valid - Answers - In terms of validity and reliability, a test must first be ______
before it can be _______.
parallel forms reliability - Answers - Using two different tests or tools (such as elastic or
string) to make an observation is an example of this.
content validity - Answers - To establish this we ask experts to determine if the test
items reflect the universe of items in the topic being measured
interrater reliability - Answers - We use reliability coefficients (# of agreements / # of
possible agreements) to determine whether two individuals have similar judgments
using a particular tool.
The IQR (interquartile range) represents this percentage of the distribution. - Answers -
50%
Line Chart - Answers - This visualization can best display data over time.
histogram or scatterplot - Answers - Interval or ratio data that are continuous are
displayed with these.
bar graph or pie chart - Answers - Frequencies, proportions or categorical data are
represented with these.
A scatterplot can display the ____ between two variables. - Answers - correlation
The four types of measurement scales - Answers - nominal, ordinal, ratio, and interval
ratio data - Answers - This is the most precise type of measurement; and can make
absolute comparisons. Weight is an example.
