Exam 2: Central Tendency and Variability

A concierge is interested in how long it takes to bring passengers to the airport and then return to the hotel.The round-trip travel times for six taxi drivers were 45,30,42,45,41,and 43 minutes. a.Compute the mean,median,and mode. b.Based on the measures of central tendency,what can you infer about the distribution? c.Compute the variance and standard deviation. d.Explain what the results mean to a person who has never had a course in statistics.

A score with an extremely high or low value (relative to other scores in the distribution)is a(n)__________.

The formula for the standard deviation used in this chapter is

When describing a nominal variable,the best measure of central tendency to use is the

Based on the scores 1,2,3,4,5,6,6,8,8,8,9,and 10,a score of 6 is the

The Greek letter that means "add up all the scores that follow" is __________.

SS refers to

In a symmetrical distribution with a mean of 15,the median would be

Which statement is true for the scores of 1,2,3,4,5,5,7,8,9,and 10?

The mode of the scores 1,2,4,4,4,6,7,8,8,9,and 10 is

In statistical formulas,N stands for

The most common single value in a group of scores is the

A measure of central tendency that is not very affected by outliers is the __________.

A social psychologist gave a survey to 8 active members of a small political action group about how many hours they put into the group's activities each week.The results were as follows: 19,24,30,33,40,41,41,and 44. a.Compute the mean,variance,and standard deviation. b.Explain what you have done and what the results mean to a person who has never had a course in statistics.

The variance of the scores 1,4,and 7 is

The value with the most scores is the __________.

The median of the scores 1,2,4,4,4,6,7,8,8,9,and 10 is

ΣX / N is the formula for the __________.

The standard deviation is __________ the variance.

If all the scores are ranked from lowest to highest,the median is the __________.