QNT 561 Week 1 Quiz

QNT
561 Week 1 Quiz

Grade on Business Statistics Exam

Frequency

Relative Frequency

A: 90-100

—

0.07

B: 80-89

50

—

C: 65-79

76

—

D: 50-64

32

—

F: Below 50

28

—

Total

200

1

Question
1
Complete the table to the right:
Question
2
An industrial group reports that
there were approximately 152,000 industrial robots operating in a region over
the last year. The graph to the right shows the percentages of industrial
robots assigned to each of six task categories. Complete parts a through e.
Dispensing/Coating-33%; Assembly-21%; Arc Welding-6%; Spot welding-3%; Material
removal-36%; Material Handling -1%.
Question
3
Use the data table to complete parts
a through c:
Interview 27; Observation and
Participation 30; Observation only 17, Grounded Theory 13, Total 87.
Question
4
Certain measurements are summarized
in the histogram to the right. What percentage of the measurements are greater
than 12?
Question
5
Explain how the relationship between
the mean and median provides information about the symmetry or skewness
of the data’s distribution.
Question
6
Five banks have been ranked by the
amount charged to credit and debit cards issued by the banks.
Bank A 456.31 billions
Bank B 462.23 billions
Bank C 436.54 billions
Bank D 236.43 billions
Bank E 193.15 billions
Question
7
Oil field pipes are internally
coated in order to prevent corrosion. Researchers investigated the
influence that coating may have on the surface roughness of oil field pipes. A
scanning probe instrument was used to measure the surface roughness of each in
a sample of 20 sections of coated interior pipe. The data in micrometers
are below:
1.68; 1.98; 1.93; 2.94; 2.18;
2.36; 2.52; 1.07; 2.76; 2.99; 1.86; 1.32; 2.69; 1.64; 1.25; 2.74; 1.76; 2.86;
2.12; 1.17.
Question
8
The salaries of superstar
professional athletes receive much attention in the media. The multimillion
dollar long-term contract is now commonplace among this elite group.
Question
9
A magazine published a study on the
ammonia levels near the exit ramp of a highway tunnel. Daily ammonia
concentrations on eight random days: 1.54; 1.51; 1.38; 1.52; 1.63; 1.44; 1.43;
1.45.
Question
10
The data on age in years and
title of 12 of the most powerful women in country A:
Rank
Age
Data on annual rainfall, maximum
daily temperature, percentage of plant cover, and number of ant species
recorded at each of 11study sites are given in the table. Complete parts a
through c.Question
12
Determine whether a random variable
is discrete or continuous:
a.
The number of points scored during a basketball game
b.
The height of a randomly selected giraffe
c.
The time it takes for a light bulb to burn out
d.
The exact time it takes to evaluate 27+72
e.
The number of light bulbs that burn out in the next week in a room with 14
bulbs.
Question
13

A discrete random variable x can
assume 5 possible values 2, 3, 6, 8, and 10. Its probability distribution is
shown here. Complete parts a through c.Question
14
In a driver-side “star” scoring
system for crash-testing new cars, each crash-tested car is given a rating
ranging from one star to five stars; the better is the level of crash
protection in a head-on collision. A summary of the driver-side star ratings
for 98 cars is reproduced in the table:Question
15
If x is binomial random variable,
compute p(x) for each of the cases below.
a.
N=4, x=2, p=0.7; a. N=6, x=3,
q=0.6; N=5, x=1, p=0.4;
N=4, x=0, p=0.4; N=6, x=3, q=0.4; N=5,
x=2, p=0.3.
Question 16
According to a consumer survey of
young adults (18-24 years of age)who shop online, 18% own a mobile phone with
internet access. In a random sample of 400 young adults who shop online , let x
be the number who own a mobile phone with internet access.
Question 17
Find a value of a standard normal random variable Z, call it
Zo, such that the following probabilities are satisfied (< and a. P(Z