central tendency + variation

Question 1

mean / mode / median from ungrouped data

Answer 1

 Menu –> number 6 -> 1 – variable
 Median – n+1/2

Question 2

mean of ungrouped data

Answer 2

x value multiplied by frequency

divided by total frequency

Question 3

median of ungrouped data

Answer 3

do cumulative frequency

same as cumulative frequency graphs

Question 4

mean of grouped data

Answer 4

use midpoint and same method as before

// change bounds

// NOT AGE

Question 5

median of grouped data

Answer 5

n/2 – use linear interpolation

Question 6

midrange

Answer 6

add two end points + divide by two

Question 7

linear coding - what does adding a number to the terms do to the mean and to the standard deviation

e.g

y= x + 10

Answer 7

mean - increase by that number - increases by 10

standard deviation - no impact

Question 8

linear coding - what multiplying the terms do to the mean and to the standard deviation

Answer 8

mean - increase by a factor of 3

standard deviation - increase by a factor of three

Question 9

is standard deviation effected by adding / subtracting

Answer 9

NO

Question 10

linear coding examples

Answer 10

Question 11

working backwards - linear coding

Answer 11

Question 12

how to identify outliers - IQR

Answer 12

Question 13

how to identify outliers - standard deviation

Answer 13