Stats Chapter 6

What is the median score for the following set of numbers? (3, 11, 8, 13, 5, 3, 6)

6 (median is the number in the middle when the numbers are in order)

A researcher wishes to survey student opinions on a proposed increase in fees at her university. She decides to select a sample for telephone interviewing by selecting every 20th name in the student directory. What is this type of sampling called?

Systematic (pg 183 of PDF)

The single score that best represents all the scores in a distribution is the definition of

central tendency (pg 190 of PDF)

The term that describes the position of the hump in the curve of a distribution is

skewness (pg 198 of PDF)

The standard deviation represents the

spread of scores about the mean (pg 288 of PDF)

Which of the following terms least belongs with the others?

standard deviation

For a group of normally distributed scores with a mean of 30 and a standard deviation of 6, the middle 68% of the scores will be between

24 and 36

What is the mode(s) for the following set of numbers? (5, 10, 4, 1, 4, 5, 12, 8, 9, 4 )

4 (mode is the number which occurs the most frequently)

After a population of 1,000 high school seniors is divided by sex and size of school attended, the random selection of a sample to represent these proportions of the population is called

Stratified random sampling (pg 183 of PDF)

Another term for the mean is the

average (pg 190 of PDF)