Week 2 Quiz Flashcards
Q1: We collected some data about how much buyers of Field’s textbook liked it (on a scale of 1 = it’s rubbish to 10 = I never read anything else). We ended up with a sample of 15,467 people. When we looked at the distribution, we found a skew of 1.23 (SE = 0.65). The mean rating was 4.78. Which of the following would be the best way to decide whether the skew is problematic?
a. See if the z-score is bigger than 1.96 or smaller than –1.96.
b. See if the skew is significant at p < .05.
c. Use the Kolmogorov–Smirnov test.
d. None of the above because of the large sample size.
d. None of the above because of the large sample size.
Q2: Which of the following is not a property of a variance ratio?
a. It can be used to demonstrate homogeneity of variances.
b. It is one variance divided by another.
c. It is one variance multiplied by another.
d. It can show the effect of a treatment on several groups.
c. It is one variance multiplied by another.
Q3: Why are z-scores used to check for outliers?
a. They standardize scores for a known mean and standard deviation, allowing comparison.
b. They allow you to allocate letters for missing values.
c. A z-score is an outlier.
d. They standardize scores in order to convert them to values closer to the mean.
a. They standardize scores for a known mean and standard deviation, allowing comparison.
Q4: Which of these variables would be considered not to have met the assumptions of parametric tests based on the normal distribution?
a. Gender
b. Reaction time.
c. Temperature.
d. Heart rate.
a. Gender
Q5: Which of the following is not an assumption of a parametric test?
a. Normally distributed data (i.e., normality of the sampling distribution)
b. Homogeneity of variance
c. Dependence
d. Independence
c. Dependence
