What is the standard deviation of the standard normal distribution?

Select one:

a. 0

b. 1

c. 2

d. Can be any positive number

Question 2

What is the standard deviation of a normal distribution?

Select one:

a. 0

b. 1

c. 2

d. Can be any positive number

Question 3

What is the mean of standard normal distribution?

Select one:

a. 0

b. 1

c. 2

d. Can be any number

Question 4

What is the probability of getting 2 or 4 dots on a die?

Select one:

a. 0

b.

c.

d.

Question 5

Which value can represent a probability?

Select one:

a. -1

b. 0.5

c. 1.3

d. 10

Question 6

Two dice are rolled. What is the probability that the sum of dots on the upward faces is 3?

Select one:

a. 0

b.

c.

d.

Question 7

Which one of these variables is a continuous random variable?

Select one:

a. The time it takes a randomly selected student to complete an exam.

b. The number of tattoos a randomly selected person has.

c. The number of women taller than 68 inches in a random sample of 15 women.

d. The number of correct guesses on a multiple choice test.

Question 8

Suppose a vehicle speeds at a stretch of freeway having a normal distribution with a mean equal to 70 mph and standard deviation equal to 8 mph. What is the z-score for a speed of 64 mph?

Select one:

a. −6

b. −0.75

c. 0.75

d. 6

Question 9

Pulse rates of adult men are normally distributed with a mean of 70 and a standard deviation of 8. Which choice correctly describes how to find the proportion of men that have a pulse rate greater than 78?

Select one:

a. Find the area to the left of z = 1 under a standard normal curve.

b. Find the area between z = −1 and z = 1 under a standard normal curve.

c. Find the area to the right of z =1 under a standard normal curve.

d. Find the area to the left of z = −1 under a standard normal curve.

Question 10

The NORMDIST or NORM.DIST functions can be used to calculate the probability using Excel instead of the Z Table.

Select one:

True

False

Question 11

Assume that the test scores of 600 students are normally distributed with a mean of 76 and a standard deviation of 8. What is the number of students scoring between 70 and 82?

Select one:

a. 164

b. 260

c. 272

d. 328

Question 12

The sample statistics are called unbiased estimators if they target the equivalent values of the underlying population.

Select one:

True

False

Question 13

Which sample statistic is an unbiased estimator?

Select one:

a. Mean

b. Median

c. Range

d. Standard Deviations

Question 14

According to the central limit theorem, the sampling distribution of the mean can be approximated by the normal distribution:

Select one:

a. As the size of the population standard deviation increases.

b. As the number of samples increases.

c. As the sample size increases.

d. As the size of the sample standard deviation decreases.

Question 15

The standard deviation of the sampling distribution of the mean is bigger than the standard deviation of the actual population.

Select one:

True

False

Question 16

For a sample size of n=10, the sampling distribution of the mean will be normally distributed:

Select one:

a. If the population is normally distributed.

b. Regardless of the population’s distribution.

c. If the shape of the population is symmetrical.

d. If the variance of the mean is known.

Question 17

The sampling distribution of the mean is a distribution of:

Select one:

a. Population values.

b. Population parameters.

c. Sample statistics.

d. Inferential statistics.

Question 18

What type of data can be represented by a normal distribution?

Select one:

a. Qualitative data.

b. Continuous data.

c. Discrete data.

d. Any type of data.

Question 19

The central limit theorem states that the mean of the sampling distribution of the mean is equal to the population.

Select one:

a. Mean divided by the population standard deviation.

b. Standard deviation divided by the square root of N.

c. Mean.

d. Standard deviation.

Question 20

If the underlying data is distributed normally, what percent of the values are within three standard deviations of the mean?

Select one:

a. 68%

b. 95%

c. 99.7%

d. 100%