Probabilities, percentiles, random sampling techniques

What is the probability that a standard normal variable Z is less than 1.25?

• 0.78881

• 0.8944

• 0.1056

• 0.2236

If the probability that Z is greater than x is 0.05, what is the value of x?

• 1.28

• 1.64

• 1.96

• 2.33

Which of the following represents the area to the left of Z=0 in the standard normal table distribution?

• 0.5000

• 1.0000

• 0.0000

• 0.8413

What is the probability that Z is between -1.00 and 1.00?

• 0.6826

• 0.8413

• 0.1587

• 0.3174

The total area under the standard normal curve is equal to 2.

• TRUE

• FALSE

The probability of Z being greater than 0.00 is equal to the probability of Z being less than 0.00.

• TRUE

• FALSE

A higher percentile corresponds to a lower Z-score.

• TRUE

• FALSE

The probability that Z falls between -1.96 and 1.96 in the standard normal distribution is ___.

• 0.9050

• 0.9500

• 0.5090

• 0.5900

The 90th percentile of the standard normal distribution corresponds to which Z-score?

• 1.28

• 1.64

• 1.96

• 2.33

The 99th percentile corresponds to a Z-score of approximately ___.

• 3.23

• 3.22

• 2.33

• 2.22