Normal (Z), T and binomial distributions

Question 1

2 other names for normal distribution

Answer 1

Z distribution

Gaussian distribution

Question 2

Describe

• shape
• symmetry
• implications for mean, median and mode

Answer 2

bell shaped
symmetrical about the mean
mean=median=mode

Question 3

area under =

Answer 3

1

Question 4

are they appropriate for continuous or discrete varibales?

Answer 4

continuous

Question 5

what two statistics does it take into account?

Answer 5

pop mean

pop SD

Question 6

Z score formula

Answer 6

(value - pop mean)/pop SD

Question 7

what does Z score transform the normal dist into? in terms of mean and SD
implications

Answer 7

mean of 0
sd of 1
shows us how many sd’s the thing is away from the mean

Question 8

does t dist have similar properties to normal dist

Answer 8

yes

Question 9

2 differences in shape of t dist

Answer 9

bell is flatter

tails are longer

Question 10

what additional factor does t distribution take into account

Answer 10

degrees of freedom

Question 11

the more degrees of freedom/bigger the sample size

Answer 11

the more normal the normal dist becomes

Question 12

describe binomial distribution

Answer 12

looks at two mutually exclusive events with known probabilities
looks at the probability of either event occuring X times