S1 Processing and Representing data

Question 1

How to calculate the mean

Answer 1

added up total of entries / number of entries

Question 2

How to calculate standard deveation

Answer 2

√((Σ(x^2)/n)- x̄^2)

Question 3

Where is the 1st quartile

Answer 3

a quarter in

Question 4

Where is the 2ndquartile

Answer 4

half way in

Question 5

Where is the 3rd quartile

Answer 5

a 3rd in

Question 6

What is the coded formula

Answer 6

y = (x-a) / b

Question 7

mean of coded data

Answer 7

ȳ = (x̄-a) / b

Question 8

standard deviation of coded data

Answer 8

sdy = sdx / b

Question 9

What is an outlier

Answer 9

Greater than Q3 + k(Q3 - Q1)
or
Less than Q1 - k(Q3- Q1)

Question 10

How to calculate the height of each bar

Answer 10

frequency desity = frequency / class width

Question 11

What 2 things can you comment on when comparing data

Answer 11

a measure of location
A measure of speed

Question 12

What are the pairs you should use for compairing data

Answer 12

mean and standard deviation
or
median and interquartile range