Measures of Location and Spread

Question 1

What are the measures of location?

Answer 1

1. Mean
2. Median
3. Mode
4. upper quartile
5. lower quartile

Question 2

What is the mode?

Answer 2

the number that appears the most.

Question 3

When is using the mode not useful?

Answer 3

when not number appears more than once.

Question 4

What is the median?

Answer 4

the middle number.

Question 5

When is using the median useful?

Answer 5

when you have extreme values

Question 6

What is the mean?

Question 7

When is using the mean not useful?

Answer 7

when you have extreme values.

Question 8

Why does the mean give a true measure of the data?

Answer 8

it takes into account all the data.

Question 9

How do you calculate the mean?

Question 10

How do you calculate the mean in a cumulative frequency table?

Question 11

How do you calculate the mean in a grouped frequency table?

Question 12

How do you find the upper and lower quartiles of discrete data?

Answer 12

1. To find the lower quartile you divide n by 4.
2. To find the upper quartile you find 3/4 of n.
3. If the number you get is whole then the lower or upper quartile will be the midpoint between that number and the next number. If it is not whole then round up and pick that number.

Question 13

How do you find the upper and lower quartiles of continuous data?

Answer 13

interpolation

Question 14

What are the measures of spread?

Answer 14

1. Range
2. Interquartile range.
3. Variance
4. Spread

Question 15

How do you measure the variance?

Question 16

How do you measure standard deviation?

Question 17

What is coding?

Answer 17

Turning the values you have into different values that are easier to deal with.

Question 18

What are the rules for coding regarding the mean?

Answer 18

you can multiply and add.

Question 19

What are the rules for coding regarding the standard deviation?

Answer 19

you can only multiply and divide