MGRADES
IB SEHS: Unit 6 UPDATED ACTUAL
Exam Questions and CORRECT Answers
sample - CORRECT ANSWER - a set of data collected/selected from a statistical
population by a defined procedure
mean - CORRECT ANSWER - the average used to derive the central tendency of the data
in question
standard deviation - CORRECT ANSWER - used to summarize the spread of data values
around the mean
68% - CORRECT ANSWER - how much of the data in a NORMAL DISTRIBUTION fall
within one SD?
95% - CORRECT ANSWER - how much of the data in a NORMAL DISTRIBUTION fall
within two SD?
steps to find standard deviation - CORRECT ANSWER - 1. find the mean
2. subtract it from each value, square that
3. work out the mean of this new set of data
4. square root that
coefficient of variance - CORRECT ANSWER - (v) the ratio of standard deviation to the
mean expressed as a percent
coefficient of variance: equation - CORRECT ANSWER - v= (100xSD)/mean
t-test - CORRECT ANSWER - a statistical test used to evaluate the size and significance
of the difference between two means
, MGRADES
paired t-test - CORRECT ANSWER - a t-test performed on a repeated measures two-
group design
-compares the control to experimental condition
-tests if a certain result is due to CHANCE
unpaired t-test - CORRECT ANSWER - a t-test performed on two different subject groups
-tests if a certain result is due to SAMPLING ERROR
reliability - CORRECT ANSWER - refers to how close a determined value is to thee
actual value
-depends on the procedure and equipment used
specificity - CORRECT ANSWER - refers to the degree to which a test is consistent and
stable in measuring what it is intended to measure
-depends on how strict the test is conducted and the individual's level of motivation to perform
the test
accuracy - CORRECT ANSWER - refers to the degree to which the test actually measures
what it claims to measure and the extent to which conclusions and decisions made on the basis of
test scores are appropriate and meaningful
validity - CORRECT ANSWER - refers to the ability of the test to correctly identify those
parameters which are most important in regards to the claims of the study
correlation - CORRECT ANSWER - the measure of a relationship between two variables
or sets of data
-DOES NOT INDICATE CAUSATION
degrees of freedom - CORRECT ANSWER - (total sample size)-2
IB SEHS: Unit 6 UPDATED ACTUAL
Exam Questions and CORRECT Answers
sample - CORRECT ANSWER - a set of data collected/selected from a statistical
population by a defined procedure
mean - CORRECT ANSWER - the average used to derive the central tendency of the data
in question
standard deviation - CORRECT ANSWER - used to summarize the spread of data values
around the mean
68% - CORRECT ANSWER - how much of the data in a NORMAL DISTRIBUTION fall
within one SD?
95% - CORRECT ANSWER - how much of the data in a NORMAL DISTRIBUTION fall
within two SD?
steps to find standard deviation - CORRECT ANSWER - 1. find the mean
2. subtract it from each value, square that
3. work out the mean of this new set of data
4. square root that
coefficient of variance - CORRECT ANSWER - (v) the ratio of standard deviation to the
mean expressed as a percent
coefficient of variance: equation - CORRECT ANSWER - v= (100xSD)/mean
t-test - CORRECT ANSWER - a statistical test used to evaluate the size and significance
of the difference between two means
, MGRADES
paired t-test - CORRECT ANSWER - a t-test performed on a repeated measures two-
group design
-compares the control to experimental condition
-tests if a certain result is due to CHANCE
unpaired t-test - CORRECT ANSWER - a t-test performed on two different subject groups
-tests if a certain result is due to SAMPLING ERROR
reliability - CORRECT ANSWER - refers to how close a determined value is to thee
actual value
-depends on the procedure and equipment used
specificity - CORRECT ANSWER - refers to the degree to which a test is consistent and
stable in measuring what it is intended to measure
-depends on how strict the test is conducted and the individual's level of motivation to perform
the test
accuracy - CORRECT ANSWER - refers to the degree to which the test actually measures
what it claims to measure and the extent to which conclusions and decisions made on the basis of
test scores are appropriate and meaningful
validity - CORRECT ANSWER - refers to the ability of the test to correctly identify those
parameters which are most important in regards to the claims of the study
correlation - CORRECT ANSWER - the measure of a relationship between two variables
or sets of data
-DOES NOT INDICATE CAUSATION
degrees of freedom - CORRECT ANSWER - (total sample size)-2
