Question 1 2 pts Let x represent the number of pets in pet stores. This

23 Aug Question 1 2 pts Let x represent the number of pets in pet stores. This

Question 1 2 pts

Let x represent the number of pets in pet stores. This would be considered what type of variable:

Discrete

Nonsensical

Continuous

Lagging

Question 2 2 pts

Let x represent sheets of paper in a package. This would be considered what type of variable:

Distributed

Continuous

Inferential

Discrete

Question 3 2 pts

Consider the following table.

Age Group Frequency

18-29           9831

30-39           7845

40-49           6869

50-59           6323

60-69           5410

70 and over 5279

If you created the probability distribution for these data, what would be the probability of 40-49?

16.5%

18.9%

23.7%

42.5%

Question 4 2 pts

Consider the following table.

Weekly hours   worked    Probability

1-30   (average=22)              0.08

31-40   (average=35)            0.16

41-50   (average=46)            0.72

51 and over   (average=61)  0.04

Find the mean of this variable.

39.0

40.2

35.9

41.0

Question 5 2 pts

Consider the following table.

Defects in   batch      Probability

0                                   0.28

1                                   0.35

2                                   0.16

3                                   0.09

4                                   0.10

5                                   0.02

Find the variance of this variable.

1.44

0.85

1.35

1.83

Question 6 2 pts

Consider the following table.

Defects in   batch      Probability

2                                 0.35

3                                 0.23

4                                 0.20

5                                 0.09

6                                 0.07

7                                 0.06

Find the standard deviation of this variable.

1.51

2.27

4.50

3.48

Question 7 2 pts

The standard deviation of the number of video game A’s outcomes is 05479, while the standard deviation of the number of video game B’s outcomes is 0.2498. Which game would you be likely to choose if you wanted players to have the most choice and why?

Game A, as   the standard deviation is higher and, thus offers fewer choices in outcomes

Game B, as   the standard deviation is lower and, thus offers more choices in outcomes

Game A, as   the standard deviation is lower and, thus offers fewer choices in outcomes

Game B, as   the standard deviation is higher and, thus offers more choices in outcomes

Question 8 2 pts

Thirty-five percent of teens buy soda (pop) at least once each week. Eleven kids are randomly selected. The random variable represents the number of these kids who purchase soda (pop) at least once each week. For this to be a binomial experiment, what assumption needs to be made?

The probability of being a teen and being a kid should be the same.

All teens have the same probability of being selected.

All the kids eligible to be selected are teens.

All eleven kids selected live in the same region.

Question 9 2 pts

A survey found that 31% of all teens buy soda (pop) at least once each week. Seven teens are randomly selected. The random variable represents the number of teens who buy soda (pop) at least once each week. What is the value of n?

x, the counter

0.07

0.31

7

Question 10 2 pts

Forty-four percent of US adults have little confidence in their cars. You randomly select twelve US adults. Find the probability that the number of US adults who have little confidence in their cars is (1) exactly six and then find the probability that it is (2) more than 7.

(1) 0.793 (2)   0.0099

(1) 0.207 (2)   0.901

(1) 0.762 (2)   0.901

(1) 0.207 (2)   0.099

Question 11 2 pts

Say a business wants to know if each salesperson is equally likely to make a sale. The company chooses 5 salespeople and gathers information on their sales experiences. What assumption must be made for this study’s probability results to be used in future binomial experiments?

That for every 5 salespeople, the probability of making a sale is the same

That the probability of each salesperson being one of the selected 5 is the same

That 5% is the correct probability to use in future studies

That the selected 5 have similar characteristics and sales areas as the oth