Suppose the critical value for a left-tailed hypothesis test is -2.56 and the test statistic is -2.21, what is the appropriate conclusion?

Reject the null hypothesis

Fail to reject the null hypothesis

Reject the alternative hypothesis

Fail to reject the alternative hypothesis

The weights of bags of chips for a vending machine are normally distributed with a mean of 1.5 ounces and a standard deviation of 0.2 ounces. What is the probability that a randomly selected bag of chips is greater than 1.8 ounces?

0.933

0.067

0.036

0.964

The probability distribution of the number of tacos that Tom will eat in a single meal can be seen below. What is the expected number of tacos that Tom will eat in a single meal?

x

1

2

3

4

P(x)

0.1

0.2

0.5

0.2

2 tacos

2.5 tacos

2.8 tacos

3 tacos

Given the probability distribution table below, find the value of k.

x

1

2

3

4

5

6

P(x)

0.03

0.18

k

0.42

0.07

0.22

0.30

0.04

0.08

0.21

Below is a frequency chart which lists the number of M&Ms in a bag. How many bags contained at least 56 M&Ms?

Number of M&Ms

Frequency

52-53

4

54-55

6

56-57

5

57-58

2

10

7

2

5

Which of the following is representative of a population?

The number of jobs every fifth college student in a statistics course.

The opinion on free college tuition of all governors of the 50 states in America.

The average annual percentage rate of 39 credit cards.

The opinions of managed health care of thirty-eight nurses working in the San Francisco area.