Clinical St P2

Question 1

what are the measures of central tendency

Answer 1

Mean
 Median
 Mode

Question 2

Which measure of central tendency is
best?

Answer 2

 Mean is generally used, unless extreme values
(outliers) exist
 Then median is often used, since the median is
not sensitive to extreme values.
 Example: Median home prices may be reported
for a region – less sensitive to outliers

Question 3

describe each quartile

Answer 3

The first quartile, Q1, is the value for which 25%
of the observations are smaller and 75% are
larger
◼ Q2 is the same as the median (50% are smaller,
50% are larger)
◼ Only 25% of the observations are greater than
the third quartile Q3