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STATISTICS EXAM 3 EXAM WITH CORRECT ACTUAL
QUESTIONS AND CORRECTLY WELL DEFINED
ANSWERS LATEST 2024 – 2025 ALREADY GRADED A+
Why do T and not Z
Under what circumstance is a T score used instead of a Z for hypothesis test ? -
(answers)The T statistic is used when POPULATION VARIANCE or STANDARD
DEVIATION is unknown
-The T statistic uses the SAMPLE VARIANCE or SD in place of the unknown
Population values
Why is T more Variable than Z
Why T distributions tend to be flatter and more spread out than a normal
distribution ? - (answers)The sample Variance s2 in the T formula changes from
one sample to another and contributes to the variability of the T statistics.
T is ESTIMATED
REJECT H0 (direction) - (answers)p<.05
FAIL TO REJECT (direction) - (answers)p>.05
Independent Measures T - (answers)MOST variable due to Individual differences
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Matched - (answers)LESS variable reduced individual difference
Repeated - (answers)LEAST variable no individual difference
Homogeneity of Variance
Why is it important for independent measures T test ? - (answers)Variances are
equal for the two populations from which the samples are obtained
*If this is violated the T statistic can cause misleading conclusions in a hypothesis
test.
How does the following influence the value of the independent-measures T
statistic and likelihood of rejecting Null hypothesis
1. Increasing the number of scores in a sample - (answers)As sample size
increases the value of T INCREASES and the likelihood of rejecting the null
hypothesis (Ho) INCREASES
How does the following influence the value of the independent-measures T
statistic and likelihood of rejecting Null hypothesis
STATISTICS EXAM 3 EXAM WITH CORRECT ACTUAL
QUESTIONS AND CORRECTLY WELL DEFINED
ANSWERS LATEST 2024 – 2025 ALREADY GRADED A+
Why do T and not Z
Under what circumstance is a T score used instead of a Z for hypothesis test ? -
(answers)The T statistic is used when POPULATION VARIANCE or STANDARD
DEVIATION is unknown
-The T statistic uses the SAMPLE VARIANCE or SD in place of the unknown
Population values
Why is T more Variable than Z
Why T distributions tend to be flatter and more spread out than a normal
distribution ? - (answers)The sample Variance s2 in the T formula changes from
one sample to another and contributes to the variability of the T statistics.
T is ESTIMATED
REJECT H0 (direction) - (answers)p<.05
FAIL TO REJECT (direction) - (answers)p>.05
Independent Measures T - (answers)MOST variable due to Individual differences
, 2|Page
Matched - (answers)LESS variable reduced individual difference
Repeated - (answers)LEAST variable no individual difference
Homogeneity of Variance
Why is it important for independent measures T test ? - (answers)Variances are
equal for the two populations from which the samples are obtained
*If this is violated the T statistic can cause misleading conclusions in a hypothesis
test.
How does the following influence the value of the independent-measures T
statistic and likelihood of rejecting Null hypothesis
1. Increasing the number of scores in a sample - (answers)As sample size
increases the value of T INCREASES and the likelihood of rejecting the null
hypothesis (Ho) INCREASES
How does the following influence the value of the independent-measures T
statistic and likelihood of rejecting Null hypothesis
