Module 5: The t-Test Questions with Correct
Answers 2025 |100% Pass
When population standard deviation is known, the z-score is used, when population standard
deviation is unknown, the __ is used - CORRECT ANSWER -t-score
True/False
Since t-scores are centered normally around the mean and form a bell-shaped curve,
probabilities can be calculated to draw inferences about populations. - CORRECT ANSWER -True
___ determine how well the t-distribution approximates the normal distribution of the z-scores.
To calculate for any sample size, n-1 - CORRECT ANSWER -Degrees of freedom (df)
A t distribution approximately resembles a normal distribution when n=___ - CORRECT ANSWER
-n=12
T-testing for a one sample test is used when __ - CORRECT ANSWER -the population mean is
known
In a one sample test, state the possible Ho and Ha hypotheses - CORRECT ANSWER -Ho:
µ = known population mean
Ha:
µ > known population mean (right tailed)
µ < known population mean (left tailed)
µ ≠ equal known population mean (two tailed)
, How to calculate df for one sample tests - CORRECT ANSWER -n-1
For t-testing, you compute ___ based on a sample statistic rather than using a standard
deviation based on a population parameter - CORRECT ANSWER -standard error
The __ is centered around the mean, extending to the left and to the right to include estimated
standard error, sx̄. It provides a range of values that would likely contain the population mean at
a given alpha level. - CORRECT ANSWER -confidence intervals
To increase the range of a confidence interval, ____ - CORRECT ANSWER -decrease the
significance level
A larger sample size ___ standard error which reduces margin of error - CORRECT ANSWER -
reduces
A 95% confidence interval tells a researcher __ - CORRECT ANSWER -A 95% confidence interval
tells a researcher that they can be 95% confidence that the true population mean falls between
the lower end -> higher end.
A 95% confidence intervals between -0.002 and 0.9205 is reported in research as: - CORRECT
ANSWER -95% CI [-0.002, 0.9205]
Cohen's d calculates effect size to determine - CORRECT ANSWER -the absolute magnitude or
size of the treatment.
The two types of sample studies include: - CORRECT ANSWER -1. Independent
2. Paired
Answers 2025 |100% Pass
When population standard deviation is known, the z-score is used, when population standard
deviation is unknown, the __ is used - CORRECT ANSWER -t-score
True/False
Since t-scores are centered normally around the mean and form a bell-shaped curve,
probabilities can be calculated to draw inferences about populations. - CORRECT ANSWER -True
___ determine how well the t-distribution approximates the normal distribution of the z-scores.
To calculate for any sample size, n-1 - CORRECT ANSWER -Degrees of freedom (df)
A t distribution approximately resembles a normal distribution when n=___ - CORRECT ANSWER
-n=12
T-testing for a one sample test is used when __ - CORRECT ANSWER -the population mean is
known
In a one sample test, state the possible Ho and Ha hypotheses - CORRECT ANSWER -Ho:
µ = known population mean
Ha:
µ > known population mean (right tailed)
µ < known population mean (left tailed)
µ ≠ equal known population mean (two tailed)
, How to calculate df for one sample tests - CORRECT ANSWER -n-1
For t-testing, you compute ___ based on a sample statistic rather than using a standard
deviation based on a population parameter - CORRECT ANSWER -standard error
The __ is centered around the mean, extending to the left and to the right to include estimated
standard error, sx̄. It provides a range of values that would likely contain the population mean at
a given alpha level. - CORRECT ANSWER -confidence intervals
To increase the range of a confidence interval, ____ - CORRECT ANSWER -decrease the
significance level
A larger sample size ___ standard error which reduces margin of error - CORRECT ANSWER -
reduces
A 95% confidence interval tells a researcher __ - CORRECT ANSWER -A 95% confidence interval
tells a researcher that they can be 95% confidence that the true population mean falls between
the lower end -> higher end.
A 95% confidence intervals between -0.002 and 0.9205 is reported in research as: - CORRECT
ANSWER -95% CI [-0.002, 0.9205]
Cohen's d calculates effect size to determine - CORRECT ANSWER -the absolute magnitude or
size of the treatment.
The two types of sample studies include: - CORRECT ANSWER -1. Independent
2. Paired
