T-Test Assessment

__________________ is a random variable that is calculated from sample data and is used in a hypothesis test.

____________ includes all of the elements from a set of data while ______________ consists of one or more observations drawn from the population.

___________ is a measure of variability calculated from every individual in the population while ______________ is calculated from only some of the individuals in a population.

The two common test statistics to be computed in hypothesis testing are ________________________ and ____________________________________.

A z-score is calculated with population parameters such as population mean and ______________________.

A t-test is used when the __________________ or standard deviation is not known.

If the number of samples is sufficiently large and the variance is unknown, then ________________________ is appropriate to be used.

If the variance is known, what test statistic is appropriate?

• t-test

• z-test

• two-tailed test

• one-tailed

One-sample t-statistic is used instead of one-sample z-statistic when ___________________.

• μ is known

• σ is known

• μ is unknown.

• σ is unknown.

Based on the Central Limit Theorem, when the sample (n) is extremely large and the variance is unknown, what is the statistical test to be used?

• t-test

• z-test

• two-tailed test

• one-tailed