QNT 275 Week 2 Quiz

Chapter 02, Section 2.1, Problem 006

The following data show the method of payment by 16 customers in a supermarket checkout line. Here, C refers to cash, C⁢K to check, C⁢C to credit card, and D to debit card, and O stands for other.

C     O    C⁢K       D     CC   D     D     C⁢K

C⁢C       C⁢C       D     C⁢C       C⁢C       O    O    O

Correct.

1. Prepare a frequency distribution table.

Category      Frequency

C

C⁢K

C⁢C

D

O

Chapter 02, Section 2.2, Problem 021

The following data give the number of turnovers (fumbles and interceptions) made by both teams in each of the football games played by North Carolina State University during the 2014 and 2015 seasons.

2     3     1     1     6     5     3     5     5     1     5     2     1

5     3     4     4     5     8     4     5     2     2     2     6

Correct.

1. Construct a frequency distribution table for these data using single-valued classes.

1. Calculate the relative frequency and percentage for each class.

Round your answers for relative frequencies to three decimal places and your answers for percentages to one decimal place.

Turnovers     Frequency    Relative Frequency    Percentage

1

2

3

4

5

6

7

8

Chapter 02, Section 2.3, Problem 027

Your answer is correct.

The following data give the times (in minutes) taken by 50 students to complete a statistics examination that was given a maximum time of 75 minutes to finish.

41   28   45   60   53   69   70   50   63   68

37   44   42   38   74   53   66   65   52   64

26   45   66   35   43   44   39   55   64   54

38   52   59   72   67   65   43   65   68   27

64   48   71   75   46   69   57   73   53   72

1. Prepare a stem-and-leaf display for these data. Arrange the leaves for each stem in increasing order. Type only digits (without spaces, commas, etc).

2

3

4

5

6

7

9. Prepare a split stem-and-leaf display for the data. Split each stem into two parts. The first part should contain the leaves 0, 1, 2, 3, and 4, and the second part should contains the leaves 5, 6, 7, 8, and 9. Type only digits (without spaces, commas, etc).

2

3

3

4

4

5

5

6

6

7

7

1. Which display (the one in part a or the one in part b) provides a better representation of the features of the distribution?

Chapter 02, Section 2.4, Problem 035

Your answer is correct.

The following data give the times (in minutes) taken by 50 students to complete a statistics examination that was given a maximum time of 75 minutes to finish.

41   28   45   59   53   69   70   51   63   68

37   44   42   38   74   53   66   65   52   64

26   45   66   34   43   44   39   55   64   54

38   52   58   72   67   65   43   65   68   27

64   50   71   75   45   69   56   73   53   72

Create a dotplot for these data.

Chapter 02, Section 2.2, Intelligent Tutoring Question 011

The following table gives the frequency distribution of the gallons of gasoline purchased by all customers on one day at a certain gas station.

Find a cumulative frequency distribution, the cumulative relative frequency and cumulative percentage for each class.

Chapter 02, Section 2.2, Intelligent Tutoring Question 011

Your answer is correct.

What is the cumulative frequency for “0 to less than 16” ?

Click if you would like to Show Work for this question:     Open Show Work

LINK TO TEXT

Attempts: 1 of 3 used

Chapter 02, Section 2.2, Intelligent Tutoring Question 011

Your answer is correct.

Find the cumulative relative frequency for “0 to less than 12”.

Round answer to three decimal places.

Click if you would like to Show Work for this question:     Open Show Work

LINK TO TEXT

Attempts: 1 of 3 used

Chapter 02, Section 2.2, Intelligent Tutoring Question 011

Your answer is correct.

What is the cumulative percentage for “0 to less than 20”?

%

Round answer to one decimal place.

Click if you would like to Show Work for this question:     Open Show Work

LINK TO TEXT

Attempts: 1 of 3 used

Chapter 02, Section 2.2, Intelligent Tutoring Question 011

Your answer is correct.

Using similar calculations to the steps above, find the percentage of customers who purchased less than 8 gallons.

%

Round answer to one decimal place.

Click if you would like to Show Work for this question:     Open Show Work

Chapter 02, Section 2.1, Additional Question 005

Correct.

Use the following data to construct a frequency table, using classes of [60, 65), [65, 70), etc.

86   90   79   82   86   95   91   90

88   92   93   80   92   95   64   90

Frequency table:

Class Interval      Frequency

[60, 65)

[65, 70)

[70, 75)

[75, 80)

[80, 85)

[85, 90)

[90, 95)

[95, 100)

Chapter 02, Testbank, Question 092

Correct.

Find the histogram that better describes the data.

Value x  Frequency    Relative Frequency

1     5     0.28

2     2     0.11

3     4     0.22

4     4     0.22

5     3     0.17

Total      18   1.000

I      II     III

Chapter 03, Section 3.1, Problem 009

Correct.

The following data set belongs to a population:

5−430−914129

Calculate the mean, median, and mode.

Round your answers to two decimal places if it is necessary.

Mean =

Median =

Mode =

Chapter 03, Section 3.1, Problem 025

Correct.

The mean age of six persons is 48 years. The ages of five of these six persons are 62, 40, 36, 46, and 44 years.

Find the age of the sixth person.

years

exact number, no tolerance

Chapter 03, Section 3.3, Problem 048

Your answer is partially correct.

Using the sample formulas, find the mean, variance, and standard deviation for the grouped data displayed in the following table.

x     f

0 to less than 4    19

4 to less than 8    21

8 to less than 12  16

12 to less than 16       12

16 to less than 20       7

20 to less than 24       5

Carry out all calculations exactly, round to 2 decimal places the final answers only.

Mean =

Variance =

Standard deviation =