T Test

When should you use the t-test? (select all that apply)

• When the sample is large

• When you are testing for a mean

• When you are given the population standard deviation

• When you are ONLY given the sample standard deviation

• When population parameters are unknown

What is an one-sample t-test used for?

• Comparing means from a sample and a population

• Comparing means from two separate samples

• Comparing means from two related samples

• Comparing means from more than two samples

What t-test type compares the means for two groups?

• Paired Samples

• Independent

• Dependent

• Mixed

Which does NOT describe a dependent t-test?

• It is also known as Paired Sample Test.

• It compares the median of the same group.

• It compares the mean of the same group.

• It compares data from different times.

Which best describes a t-test?

• It is a type of descriptive statistics.

• It is used to determine if there are significant differences.

• It can be used as long as the data is not normally distributed

• All of the above.

What is an independent t-test used for?

• Comparing means from a sample and a population

• Comparing means from two separate samples

• Comparing means from two related samples

• Comparing means from more than two samples

Which is true if alpha is set to .05?

• P-Value < 0.05 - reject hte null

• P-Value < 0.05 - null cannot be rejected

• P-Value > 0.05 - there's statistical difference

• None of the above

How do you look for the critical value of a dependent t-test?

• Set alpha-- get dof (n pairs-1) -- determine if one-tail/two tail-- look up value in table

• Set alpha-- get dof ((n-1)+ (n-1)) -- determine if one-tail/two tail-- look up value in table

• Set alpha-- determine if one-tail/two-tail-- look up value in table

What is a dependent t-test used for?

• Comparing means from a sample and a population

• Comparing means from two separate samples

• Comparing means from two related samples

• Comparing means from more than two samples

Which t-test would be used for this example?

'Measuring patients' blood sugar before and after they eat a meal'.

• One sample t-test

• Matched-samples t-test

• Dependent t-test

• Variance t-test