EDUC 815 Quiz: Statistical and Sampling Techniques
- Stem-and-leaf displays are useful because they make it easy to
- Correlational statistics serve the purpose of determining
- Compared to the median, the mean
- One way to increase statistical power is to
- The mean and standard deviation of a sample’s distribution of scores on a measure can be used to estimate
- Age equivalents, grade equivalents, and normal curve equivalent scores are all
- Stratied random sampling is usually a better approach than random sampling if the researcher
- The practical signicance of a research nding usually is best determined by
- The mean and the _____________________ taken together, give a good description of the nature of the group being studied.
- One of the advantages of stem-and-leaf displays of data is that they facilitate the detection of outliers. What is an outlier?
- “An investigator wants to compare the reading comprehension of rst-grade students who are taught reading by treatment A versus rst-grade students taught reading by treatment B. He selects all rst graders in Washington Elementary School (6 classes, N = 200) and places their names in a hat. The rst 60 names taken from the hat are placed in treatment A, and the next 60 names are placed in treatment B. What procedure has the researcher used?”
- Which of the following is an important criterion for determining whether an experiment has population validity?
- The median of a group of scores
- Skewness means that
- A test of the statistical signicance of the difference between two sample means results in a t value that is signicant at the .01 level. Which of the following is not a correct interpretation of this nding?
- The difference between continuous scores and discrete scores is that
- Replication logic refers to
- If a score distribution forms a normal curve,
- The deviation of a sample statistic from the actual parameter for the population from which the sample was randomly drawn is a measure of
- Statistical power is