Y2 ch 3 Normal distribution

Question 1

What is the mean in the normal distribution?

Answer 1

-point of symmetry.

Question 2

What does changing standard deviation do?

Answer 2

-Makes it skinnier or wider.

Question 3

How to work out the probabilities of the normal distribution?

Answer 3

-work out total area under the graph and it all must equal 1.

Question 4

What are the two parameters of normal distribution?

Answer 4

-(standard deviation and mean).

Question 5

What are the features of a normal distribution curve?

Answer 5

-Has asymptotes at each and and points of inflexion at one std dv below and above the mean.

Question 6

What is the approximate values that the amount of data is one standard deviation from the mean?

Answer 6

-68% of the data is within one std dv of the mean.

95% of the data is within two std dv of the mean.

Question 7

What is the main thing to do when working out inverse normal distribution?

Answer 7

Always try and work the problem for P(X<a></a>

Question 8

How to deal with an inequality in the form a

Answer 8

Do P(X<b></b>