An assumption underling the independent t-test is that the sample sizes are equal.

A researcher was interested in examining the effects of the daily amount of creatine (5 grams, 10 grams, 15 grams, 20 grams) on the 50-yard sprint time of 200 female runners who volunteered for the study. From these 200 participants, 50 participants were randomly assigned to a daily dose of 5 grams of creatine; 50 participants were randomly assigned to a daily dose of 10 grams of creatine; 50 participants were randomly assigned to a daily dose of 15 grams of creatine; and 50 participants were randomly assigned to a daily dose of 20 grams of creatine. After being on the creatine dosage for 2 weeks, each participant’s 50-yard sprint time was measured. What statistical technique would you use to examine the effects of the daily amount of creatine on sprint time? 

A researcher was interested in examining the effects of the daily amount of creatine (5 grams, 10 grams, 15 grams, 20 grams) on the 50-yard sprint time of 200 female runners who volunteered for the study. From these 200 participants, 50 participants were randomly assigned to a daily dose of 5 grams of creatine; 50 participants were randomly assigned to a daily dose of 10 grams of creatine; 50 participants were randomly assigned to a daily dose of 15 grams of creatine; and 50 participants were randomly assigned to a daily dose of 20 grams of creatine. After being on the creatine dosage for 2 weeks, each participant’s 50-yard sprint time was measured. What is the independent variable?

A researcher develops a linear regression prediction equation with their first sample of participants, and then uses that equation to predict scores in a second new sample of participants.  The researcher should expect the prediction errors to tend to

Impact of weight loss on health-related quality of life in older females. What is the dependent variable?

 A Type II error occurs when

The term “sandwich generation” refers to:

A signal is relayed along a neuron by and from one neuron to the next by .

Erickson believed that the primary psychosocial task of adolescence was:

Which of these concepts is important to conduct research ethically?