chapter 3 main ideas

Question 1

what are the 3 central tendencies?

Answer 1

mean: average, median: middle position of all the scores, mode: most frequent score

Question 2

sample mean symbol vs population mean

Answer 2

M= sample
μ= population

Question 3

Why not use the mode more with quantitative data?

Answer 3

You are essentially ignoring a lot of useful information (all of the data other than the mode). Not ideal.

Question 4

good reasons to use mode or median

Answer 4

1.) Non-normal data (e.g. skewed data)

2.) Nominal/ qualitative data

3.) Ordinal data

otherwise always use mean

Question 5

positively skewed

Answer 5

majority of scores are lower and a few large scores are at the tail

Question 6

if the data is evenly distributed the mean mode and median will be

Answer 6

equal

Question 7

in a positively skewed example what is the order of mean median and mode?

Answer 7

mode, median, mean

Question 8

In a negatively skewed example what is the order of mean median and mode?

Answer 8

mean, median, mode (alphabetical order)

Question 9

ways to graph means

Answer 9

bar and line graphs