Chapter 11 Quiz Review

When a single sample of individuals is measured more than once on the same dependent variable, then it is known as a Repeated-Measures Design or ____ ____ design.

• Between Subjects

• Within Treatments

• Within Subjects

• Between Treatments

What is the null hypothesis for a repeated-measures t-test?

• H_o: μ_D = 0

• H_o: μ₁ - μ₂ = 0

• H_o: μ = 0

• H_o: All population means are the same.

If a repeated-measures study has df = 28, how many participants were in the study in total?

• 27

• 29

• 30

• 32

Answer explanation

Since repeated measures deal with the same sample, we would only subtract one degree of freedom. Since the df is 28, we would add 1 degree of freedom back to get the total number of participants: n = 28 + 1 = 29.

Which of the following displays the correct t formula when solving for a repeated-measures study?

What is the primary advantage of a repeated-measures design?

• Allows the treatment to be the absolute reason for a change in scores

• Used for studying, learning, and developing over time

• Only requires a small number of participants

• Eliminates problems caused by individual differences

Answer explanation

The primary advantage of a repeated-measures design is that it reduces problems caused by individual differences (age, IQ, gender, personality, etc.).

What is the tactic we use to deal with time-related factors and order effects in a repeated-measures study?

• Counterbalance

• Maturation

• Internal Ananlysis

• Decoding and Constraint

Answer explanation

We can use this option to deal with time-related factors and order effects by counterbalancing the order of presentation of treatments.

According to APA-styled writing, what must we report last in our statement of significance?

• P-value

• Effect Size

• t value

• Estimated Standard Error

A repeated-measures t-test must have independent observations within a treatment, and the population distribution of D scores must be assumed to be normal.

• True

• False

Answer explanation

True. These are the two assumptions needed to know that a repeated-measures test is valid.

What is a repeated-measures t-test called in SPSS?

• Paired-Samples T Test

• Matched-Samples T Test

• Repeated-Measures T Test

• Compared Means T Test

With a sample of n = 7 and a variance of s² = 12.33, what is our estimated standard error?

• s_MD = 1.76

• s_MD = 1.33

• s_MD = 1.96

• s_MD = 1.25