When comparing two groups using an independent samples t-test, you must ensure that these groups are equal in size. Otherwise, you cannot use this t-test.

What do you do when the homogeneity of variance assumption is violated in a t-test?

Which of the following is not true about a confidence interval?

Compute the pooled variance, the estimated standard error of the mean difference, and the t statistic. s2p = [color1] s(M1 – M2) = [color2] t = [color3] Note: Round up to two decimals when necessary.

Suppose a researcher wants to decrease the width of the confidence interval. What are two ways in which this can be accomplished?

The difference between a one-sample and independent-samples t-test is that when using the latter we are __________ .

State the null and the alternative hypotheses using symbols. 

Compute Cohen’s d to measure the size of the effect in the study in Q20. d = [color1]

One reflector is 5 times deeper than another. The time of flight of sound to the deeper structure is _____ the time of flight of the shallower reflector.

Define and describe Time of flight and how it relates to ultrasound.