Week 3

Question 1

What is the Mean?

Answer 1

measure of the centre of the data

Question 2

What is a Standard Deviation?

Answer 2

Calculates the distance between each data point and the mean
- Can’t be negative
- Greatly affected by outliers

Question 3

What is the population mean formula?

Answer 3

Funny topless P = sum of all numbers from the bottom to the top, and dividing it by N (number of data sets)

Question 4

What is the sample mean formula?

Answer 4

x bar = sum of all numbers from bottom to top, and dividing it by n (number of data sets)

Question 5

What is the Range?

Answer 5

interval between the minimum and maximum values

Question 6

What is the population standard deviation formula?

Answer 6

Leo sign

1. Find population mean
2. Find (distance between observation (Xi) and mean) ^2
3. Do it for every number, add them up and divide by the population size N
4. Square root the answer

Question 7

What is the sample standard deviation formula?

Answer 7

1. Find the sample mean
2. Find the (distance between observation (Xi) and mean)^2
3. Do it for every number, add them up and divide by the population size n
4. Square root it

Question 8

What does a ________ standard deviation mean?

1. closely grouped data
2. spread out data
3. lots of outliers

Answer 8

1. small
2. medium/large
3. large