Question

LAB 6.1: Answer the following questions completely, showing all calculations and stating a conclusion. Use MINITAB to find needed probabilities (6 Marks: 2 marks for each of a., b., and c.) a) Obtain the z-score that has area 0.80 to its left under the stěndard normal curve. b) Obtain the Z-score that has area 0.70 to its right. c) Determine 20.015.

Answer 1

a)

P(Z < 0.84) = 0.80

using minitab

z score = 0.84

c)

P(Z > z) = 0.70

P(Z < z) = 0.30

using minitab

P(Z < -0.52) = 0.30

z score = -0.52

d)

Z_0.015 = 2.17

ie

That is find z such that:

P( Z < z ) = 0.015

Thus look in z table for Area = 0.015 and find corresponding z value.

using minitab

z0.015=-2.17