Question

Question 15


Which one of the following statements is incorrect?


(1) Graphs provide an overview of the profile of random variables.

(2) Descriptive statistics identify the location, dispersion and shape of the data.

(3) The location (central tendency) refers to where the data values are spread about the middle

values.

(4) Three commonly used central location statistics are: average, median and mode.

(5) The second quartile equals the median.



Question 16


The middle value in an ordered array of numbers is the:


(1) Midpoint.

(2) Median.

(3) Mean.

(4) Mode.

(5) None of the above.

Answer 1

15) (3) The location (central tendency) refers to where the data values are spread about the middle

values.

The concept of central tendency that provides a measure of the middle value of a set of data values only gives a partial description. A fuller description can be obtained by obtaining a measure of the dispersion (or spread) of the distribution. This kind of measure indicates whether the values in the dis- 

tribution group closely about an average or whether they are more dispersed.

16) (2) Median

The middle value of an ordered array of numbers is the Median