T-Test Assessment

(a)   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.

(a)  

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

(a)  

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

(a)  

A z-score is calculated with population parameters such as population mean and (a)   .

A t-test is used when the (a)   or standard deviation is not known.

If the number of samples is sufficiently large and the variance is unknown, then (a)   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