Exam 3: Measures of Central Tendency and Variability

After giving a test to all members of his college class,a professor found that the scores totaled 1500 and the mean was 75.How many students took the test?

The range indicates the

Which of the following statements is true about the median?

Briefly define the mode and identify its weakness as a measure of central tendency.

Measures of central tendency include the following EXCEPT _____.

The median is used as the measure of central tendency when defining the sum of squares.

If you were to randomly select one score from a set of scores,the score most likely to be selected _______.

Consider the following scores achieved by subjects taking a standard IQ test: 68,83,93,100,101,103,106,120.The mode is ______.

Define skewness and describe what is meant by positively and negatively skewed distributions.

Ideally,when trying to characterize a set of scores,it is useful to report all three indices of central tendency.

The sum of squared deviations from the mean will always be greater than the sum of squared deviations around any other index of central tendency.

In a normal distribution,the _____.

A teacher wants to determine the mean score of students taking a newly developed test.Her students scored as follows: 40,45,60,65,70,70,70,80,90,100.Compute the mean for the class.

If SS for 30 students is 900,what is the variance?

If you subtract the mean from each X score and sum these scores,the sum will equal:

What is a central tendency?

The range is a measure of central tendency.

The mean is computed by summing all of the scores and then dividing the sum by the:

If a distribution is less peaked than another,it is said to be more____;if it is more peaked than another,it is said to be more_____.

Distributions of scores can have _____.