Stats Medic

The random variable x is normally distributed with mean μ=174 and standard deviation σ=20. What is the z score if x=170?

• -0.2

• 0.2

• 2.8

• 3.4

The random variable x is normally distributed with mean μ=174 and standard deviation σ=20. What is P(x<170)?

• 0.2493

• 0.4207

• 0.5238

• 0.5938

The random variable x is normally distributed with mean μ=174 and standard deviation σ=20. What is the z score if x=200?

• -2.39

• -1.40

• 1.30

• 2.34

The random variable x is normally distributed with mean μ=174 and standard deviation σ=20. What is P(x<200)?

• 0.1024

• 0.3521

• 0.6433

• 0.9032

The random variable x is normally distributed with mean μ=174 and standard deviation σ=20. What is P(x>182)

• 0.2341

• 0.3446

• 0.4213

• 0.8765

The random variable x is normally distributed with mean μ=174 and standard deviation σ=20. What is P(172<x<192)

• 0.1231

• 0.3557

• 0.6768

• 0.9132

Find P (z < 1.4 or z > 3.04).

• 0.0047

• 0.9204

• 0.8956

• 0.4981

What does this symbol represent?

• parameter

• sample proportion

• parameter of a population

• population proportion

What does this symbol represent?

• population proportion

• parameter

• sample proportion

• population sample

What does this symbol represent?

• mean of the parameter

• mean of a population

• mean of a sample

• mean of a proportion