PSYC 354 Quiz 3 Variability
PSYC 354 Quiz 3: Variability
- For a sample with M = 10 and s = 2, a score of X = 13 would be considered an extreme score, far out in the tail of the distribution.
- Data sets can be divided into four quartiles.
- If sample variance were to be computed by dividing SS by n, then the average value of the sample variances from all the possible random samples would consistently _____ the population variance.
- For a population of scores, the sum of the deviation scores is equal to 0.
- Which set of scores below has the smallest standard deviation?
- Which of the following is a consequence of increasing variability?
- It is only appropriate and possible to calculate the variance and standard deviation as measures of variability for variables measured using a(n) _____ scale of measurement.
- A researcher conducts a research study to examine how a new treatment for anxiety compares in efficacy to a standard therapy. This researcher assigns clinically anxious participants to either a new treatment or standard treatment for six months, and then observes anxiety levels following. The researcher finds that the new treatment group has an average anxiety score of M = 50 with a standard deviation of s = 5 following treatment, whereas the standard treatment group has an average anxiety score of M = 60 with a standard deviation of s = 6. Which statement below is consistent with how these results would be reported in an APA style journal article?
- The box plot below depicts the median number of hours a population of N = 12 students reported studying for their first exam within a class. Which statement below is not true based on the box plot?
- What the variance for the following sample of n = 3 scores? Scores: 1, 4, 7
- What is the variance for the following population of scores? Scores: 2, 5, 6, 3
- What is the range for the following set of scores obtained for a discrete variable for which 0 is not a possible score? Scores: 5, 7, 9, 13
- A sample of n = 9 scores has SS = 72. The variance for this sample is s2 = 9.
- If the population variance is 6, then the population standard deviation is σ = 36.
- What is the value of SS (sum of squared deviations) for the following sample? Scores: 2, 4, 5, 9