chapter 17 - normal distribution

Question 1

normal notation

Answer 1

X~N(μ,σ²)

Question 2

normal distribution

Answer 2

• bell shaped curve - symmetrical
• probability = area under graph
• nearly all data is within 3σ of the mean

Question 3

Z world

Answer 3

Z = (X -μ)/σ
Z~N(0,1)

Question 4

inverse normal

Answer 4

P(X< x) = p
can find x if you have p

Question 5

should to be modelled by normal

Answer 5

• if its symetrical
• if nearly all data is within 3σ of the mean
• if np >5 and nq> 5
  np = μ and σ² = npq