Stat&Prob Quiz

Which of the following describes the standard normal distribution?

• has a mean of 1 and a variance of zero (0).

• has a mean of zero (0) and a standard deviation of 1.

• has an area equal to 0.5.

• cannot be used to approximate discrete probability distributions.

A random variable X has a mean of 4 and a standard deviation of 2. What is the corresponding z-score for x = 7?

• 0.5

• 1.0

• 1.5

• 2.0

What is the area if the z - score given is -1.83?

• 0.0344

• 0.0336

• 0.0329

• 0.0322

What is the z-value if the area is 0.9608?

• -1.76

• 1.77

• -1.77

• 1.76

Using the standard normal curve, what is the approximate area of P(1.63 < Z< 2.79)?

• 0.0049

• 0.0489

• 0.9484

• 0.9974

The weights (in kg) of 11-STEM B follow a normal distribution and has a mean of 50 and a standard deviation of 5. How many students have weights greater than 57?

• 1.4

• 0.0808

• 0.9192

• 0.9332

It refers to the entire group that is under study or investigation.

• population

• sample

• random sampling

• subset

It is a subset taken from a population, either by random or nonrandom sampling techniques.

• population

• sample

• random sampling

• simple random sampling

What sampling technique in which members of the population are listed and samples are selected in intervals.

• systematic sampling

• lottery sampling

• stratified random sampling

• quota sampling

It refers to a part of the sampling technique where each sample point has an equal chance of being selected.

• systematic sampling

• Simple random sampling

• random sampling

• quota sampling