Question

The mileages (in thousands) of a sample of 12 cars from a rental car company’s fleet are: 6 14 3 7 11 13 8 5 10 9 12 9

The mean mileage (in thousands) equals: [A] 8.44 [B] 8.92 [C] 9 [D] 9.5

The mode of the sample equals: [A] 8 [B] 9 [C] 10 [D] does not exist

The lower (first) quartile equals: [A] 6.25 [B] 6 [C] 5.5 [D] 5

The variance of the sample equals: [A] 3.32 [B] 11.09 [C] 10.08 [D] 10.99

The range equals: [A] 11 [B] 7 [C] 14 [D] 3

The interquartile range equals: [A] 8 [B] 5.5 [C] 11 [D] 4.5

Answer #1

A firm wants to establish how long it is supposed to take to
assemble a certain product.
A random sample of 13 employees is selected and the company
measures how long it takes each of them to assemble the product
rounded to the nearest minute.
Data: 5; 45; 11; 9; 14; 22; 45; 16; 30; 25; 19; 45; 15
Solve the following by hand.
You must show your work including the formulas and all your
computations.
3. The mean is:...

Rent'R Cars is a multisite car rental company in the city. It is
trying out a new "return the car to the location most convenient
for you" policy to improve customer service. But this means that
the company has to constantly move cars around the city to maintain
required levels of vehicle availability. The supply and demand for
economy cars, and the total cost of moving these vehicles between
sites, are shown below.
From\To
D
E
F
G
Supply
A...

Rent'R Cars is a multisite car rental company in the city. It is
trying out a new "return the car to the location most convenient
for you" policy to improve customer service. But this means that
the company has to constantly move cars around the city to maintain
required levels of vehicle availability. The supply and demand for
economy cars, and the total cost of moving these vehicles between
sites, are shown below.
From\To
D
E
F
G
Supply
A...

The owner of Maumee Motors wants to study the relationship
between the age of a car and its selling price. Listed below is a
random sample of 12 used cars sold at Maumee Motors during the last
year:
Car
Age (years)
Selling Price ($ thousands)
Car
Age (years)
Selling Price ($ thousands)
1
8
$9.5
7
6
$10.0
2
13
5.5
8
2
5.5
3
7
9.7
9
1
9.6
4
15
3.6
10
4
3.1
5
9
3.2
11...

Consider the data in the table collected from four independent
populations. a=0.10
Sample 1- 19, 12, 14, 17
Sample 2- 13, 19, 10
Sample 3- 17, 14, 16, 8
Sample 4- 8, 13, 9
a) Determine the value of SST. (Round to one decimal place as
needed.)
b) Determine the values of SSB and SSW. (Round to one decimal
place as needed.)
c) What is the critical F-score, Fα? (Round to three decimal
places as needed.)
d) What is the...

Part 2 (Numerical Descriptive Techniques)
The following data represent the ages of a sample of 25
employees from a government department. Enter this data on a sheet
called Employee Data.
31
43
56
23
49
42
33
61
44 28
48
38
44
35
40
64
52
42
47 39
53
27
36
35 20
Find the median age.
Find the lower quartile of the ages.
Find the upper quartile of the ages.
Compute the range and...

Consider the following data from a random sample: 23 12 26 14 20
25 14 11 21 14 25 21 22 21 8 19 17 22 17 16
a.) Construct a stem-and-leaf plot and specify the five-number
index (min, Q1, Q2, Q3, & max)
b.) Compute the mean and the standard deviation
c.) Find a 95% confidence interval for the population mean.

Exhibit 14-2 A sample of data y x 5 15 7 12 9 10 11 7
For each unit that x goes up the predicted value of y
a. goes down by 0.7647
b. goes up by 0.7647
c. does not change
d. is the same as the p-value

The following are the weights of a sample of female high school
students:
08 |8
09 | 5 2 0 9
10 | 4 9 3
11 | 5 9 8 3
12 | 3 9 7 7 6
14 | 0 6 3
15 | 4 1 7 2
18 | 5
This table, for example, indicates that one female weighs 88 pounds
and that no female students weigh between 130 and 139 pounds.
(a) Find the mean weight....

The following sample data is taken from the normal population:
10, 8, 12, 15, 13, 11, 6, 5.
a. What is the estimator of the average population
b. What is the estimator of the population standard deviation
c. At the 95% confidence level, what is the error margin of the
population mean estimator
d. Determine 95% confidence intervals for the population mean

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