Exam 3

Question 1

A standard normal probability distribution has a mean of 1 and a standard deviation of 0

Accepted Answer

False

Question 2

Which of the following are examples of discrete random variables?

Accepted Answer

The number of students who received an "A" on their statistics exam., The number of people who vote for the Democratic candidate in the election.

Question 3

The highest point on the normal curve is the...

Accepted Answer

mode, median, mean

Question 4

What is the z-value that correlates to a 90% confidence interval?

Accepted Answer

1.645

Question 5

Larger values of the standard deviation makes shorter, narrower curves

Accepted Answer

False

Question 6

Degrees of freedom is found by subtracting one from the population size

Accepted Answer

False

Question 7

An interval estimate can be computed by adding and subtracting a marginof error to the parameter

Accepted Answer

False

Question 8

s is the point estimator of sigma.

Accepted Answer

True

Question 9

The probability of any x value of a discrete distribution is

Accepted Answer

0 ≤ x ≤ 1

Question 10

The probability that a continuous random variable takes any specific value is...

Accepted Answer

depends on the probability density function

Question 11

Based on the empirical rule, within 2 standard deviations of its mean what is the percentage of values

Accepted Answer

95.44%

Question 12

When using a z table for interval estimation, this means...

Accepted Answer

Sigma is known

Question 13

With sampling, a frame is...

Accepted Answer

list of the elements that the sample will be selected from

Question 14

Discrete random variable is...

Accepted Answer

A random variable which can only take a countable number of values.

Question 15

The uniform probability density function is f(x) = 1/(b – a)

Accepted Answer

True

Questions 15