Question 1

Percentiles divide a set of data into how many equal parts:

Question 1 options:

a) 1

b) 10

c) 100

d) it does not divide data

Question 2 (1 point)

Percentiles are positional measure to indicate what percent of the observations in a data set have a value _____ _____ a specified value.

Question 2 options:

a) greater than

b) greater than or equal to

c) less than

d) less than or equal to

Question 3 (1 point)

The 9th decile is equivalent to:

Question 3 options:

a) 9th percentile

b) 90th quartile

c) 9th median

d) 90th percentile

Question 4 (1 point)

If the rank of the median within an array is calculated to be 25 then:

Question 4 options:

a)

the median is 25

b)

the first quartile is 25

c)

the value of the median is not yet known

d)

the rank of the median can never be 25

Question 5 (1 point)

What is the rank of P₅₅ in a data set with 60 values?

Your Answer:

Question 5 options:

When constructing percentile graphs you must use:

Question 6 options:

a) medians

b) frequency distribution

c) data values

d) position of the median

Question 7 (1 point)

The midpoint of a class is calculated using:

Question 7 options:

a) frequency

b) lower limit and upper limit

c) total

d) average of frequency

Question 8 (1 point)

The interquartile range is the difference between which two percentiles?

Question 8 options:

a) 3rd quartile and 1st quartile

b) 80th percentile and 10th percentile

c) 2nd quartile and 1st quartile

d) 7th decile and 3rd quartile

Question 9

A box and whisker plot shows the ____ of a data set.

Question 9 options:

a) distribution

b) mean

c) mode

d) 40th percentile

Question 10

What do the ends of the box represent in a box and whisker plot?

Question 10 options:

a)

quartiles

b)

percentiles

c)

measures of central tendency

d)

upper and lower limits

Question 11

What does the vertical line inside the box represent?

Question 11 options:

a)

median

b)

mode

c)

mean

d)

first quartile

Question 12

If the median is near the centre of the box, the distribution is approximately _____.

Question 12 options:

a) symmetric

b) negatively skewed

c) positively skewed

d) mound shaped

Question 13 (1 point)

If the right whisker is larger than the left whisker, the distribution is _____.

Question 13 options:

a)

symmetric

b)

negatively skewed

c)

positively skewed

d)

mound shaped