Normal Distribution

Question 1

What is meant by distribution

Answer 1

The way in which something is shared out among a group

Question 2

What is frequency distribution

Answer 2

This is the amount of times The value appears in a sample

Question 3

What is a normal distribution

Answer 3

This is when the distribution is perfectly symmetrical around the measures of central tendency

Question 4

What is a positive skew where did the measures of central tendency sit

Answer 4

A positive skew is where the frequency lies towards the left of the histogram mode is more towards the left then mean and median

Question 5

What is the negatives skew where did the measures of central tendency lie

Answer 5

A negative Skew is where the bulk of the frequency it’s on the right hand side the mode is more to the right of mean and median

Question 6

What is Kurtosis

Answer 6

This is the steepness of the curve

Question 7

What is a lepokurtic curve

Answer 7

This is a very steep curve with short tails

Question 8

What is a platykurtic curve?

Answer 8

This is shallow with long thin tails

Question 9

What is a Mesokurtic curve?

Answer 9

This is a simple bell curve

Question 10

What is a bimodal distribution

Answer 10

This is a mixture of two distributions with two separate peaks (means)

Question 11

What kind of distribution is needed to meet parametric assumptions

Answer 11

It needs to be symmetrical

Think bell curve

Question 12

In a normal distribution what percentage of the population falls within 1, 2 and 3 standard deviations?

Answer 12

1 SD = 68.26%
2 SD = 95.44%
3 SD = 99.75%

Question 13

How do you work out the Z score?

Answer 13

This is the number of standard deviations of value is from the mean