QNT 275 Week 1 Quiz

QNT 275 Week 1 Quiz

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 QNT 275 Week 1 Quiz

Chapter 01, Testbank, Question 002

 

Your answer is correct.

 

Under inferential statistics, we study

 

 

 

how a sample is taken from a population

 

the methods to make decisions about one or more populations based on sample results

 

tables composed of summary measures

 

how to make decisions about a mean, median, or mode

 

 

 

 

Chapter 01, Testbank, Question 046

 

Your answer is correct.

 

Classify the variable as discrete or continuous.

 

Duration of your last 30 cell phone calls.

 

 

 

 

 

 

Chapter 01, Testbank, Question 048

 

Your answer is correct.

 

An independent group wants to determine if the consumption of gasoline has increased due to changes in price. The group randomly selects 320 gas stations from 12 different states and collects data from the month of the year when gas is the cheapest and from the month of the year when gas is the most expensive. The data shows no significant difference in gas consumption between the two months.

 

In this example, what is the variable being studied?

 

 

 

The 320 gas stations chosen.

 

The price of gasoline.

 

The consumption of gasoline.

 

The 12 different states.

 

 

 

Chapter 02, Testbank, Question 046-051

The following table gives the frequency distribution of the number of telephones owned by a sample of 50 households selected from a city.

Number of Telephones Owned       f

0     2

1     19

2     14

3     3

4     12

 

The relative frequency of the second class, rounded to two decimal places, is:

 

The number of households which own more than one telephone is:

 

The percentage of households which own three or more telephones is:

%

The number of households which own one or two telephones is:

 

The percentage of households which do not own a telephone is:

 

The number of classes for this frequency distribution table is:

 

 

 

Chapter 02, Section 2.2, Problem 012a

A data set on money spent on lottery tickets during the past year by 200 households has a lowest value of $1 and a highest value of $1640. Suppose we want to group these data into 6classes of equal widths.

Assuming we take the lower limit of the first class as $1 and the width of each class equal to $300, write the class limits for all six classes.

 

 

 

Number of Class Lower Limit  Upper Limit

1     1     300

2     301 600

3     601 900

4     901 1200

5     1201      1500

6     1501      1640

 

 

Number of Class Lower Limit  Upper Limit

1     1     299

2     300 599

3     600 899

4     900 1199

5     1200      1499

6     1500      1640

 

 

Number of Class Lower Limit  Upper Limit

1     1     299

2     300 599

3     600 899

4     900 1199

5     1200      1499

6     1500      1799

 

 

Number of Class Lower Limit  Upper Limit

1     1     300

2     300 600

3     600 900

4     900 1200

5     1200      1500

6     1500      1800

 

 

Number of Class Lower Limit  Upper Limit

1     1     300

2     301 600

3     601 900

4     901 1200

5     1201      1500

6     1501      1800

 

 

 

 

Chapter 02, Testbank, Question 090

The following table shows the countries whose teams have won the UEFA Champions League.

 

Country Frequency

Spain     12

England 11

Italy       11

Germany      6

Portugal       4

Other     10

 

 

 

 

a) Calculate the relative frequency of each country. Round your answers to three decimal places.
 

 

Spain:

England:

Italy:

Germany:

Netherlands:

Other:

 

 

 

b) Select the pie chart that better describes the data.
 

 

I   II   III
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