Distribution Facts

Question 1

Reasons for binomial distribution

Answer 1

Fixed probability of success, fixed number of trials, trials are independent, only two outcomes

Question 2

Reasons for approximating normal distribution to a binomial

Answer 2

N is large and p is close to 0.5

Question 3

Describe the shape of a normal distribution

Answer 3

Bell curve, mean and median in the centre, points of inflection at +sd and -sd

Question 4

Reasons for histogram

Answer 4

Data is continuous and in grouped frequency tables, of unequal class widths

Question 5

What is the p-value

Answer 5

The probability of the event being tested occurs after the null hypothesis has been assumed (the thing which is compared to the significance level)

Question 6

What is the z-value

Answer 6

(Value - Mean)/Standard Deviation