1. Which of the following are requirements of a random sample? a. Every individu

Question

1. Which of the following are requirements of a random sample?

a. Every individual has an equal chance of being selected.

b. There must be sampling with replacement.

c. The probabilities cannot change during a series of selections.

d. All of the other three choices are correct.

2. What proportion of a normal distribution is located between z = –1.50 and z = +1.50?

a. 0.0668

b. 0.9332

c. 0.4332

d. 0.8664

3. What is the probability of randomly selecting a z-score greater than z = 0.75 from a normal distribution?

a. 0.2266

b. 0.2734

c. 0.7734

d. 0.4532

Explanation / Answer

1. Which of the following are requirements of a random sample?

a. Every individual has an equal chance of being selected.

2. What proportion of a normal distribution is located between z = –1.50 and z = +1.50?

using tables we have

1 - 0.0568 - 0.0568 = 0.8864

3. What is the probability of randomly selecting a z-score greater than z = 0.75 from a normal distribution?

using tabvles of normal distribution

P( z > 0.75) = 0.2266

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