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Nov 24, 2024
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MATH 1280 graded quiz unit 3
Introduction to Statistics (University of the People)
Studocu is not sponsored or endorsed by any college or university
MATH 1280 graded quiz unit 3
Introduction to Statistics (University of the People)
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MATH 1280-01 Introduction to Statistics - AY2022-T4
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My courses
MATH 1280-01 - AY2022-T4
21 April - 27 April
Graded Quiz Unit 3
Started on
Wednesday, 27 April 2022, 3:44 PM
State
Finished
Completed on
Wednesday, 27 April 2022, 4:10 PM
Time taken
26 mins
Marks
14.00/16.00
Grade
87.50
out of 100.00
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There are 16 questions on this quiz. You will see a small group of questions at a time.
Consider the following study: Marketing researchers Dominique and Huong wanted to know the following: “What percent of customers wear rain jackets at Seattle Food Store each day?” In an attempt to answer that question, Dominique and Huong designed a study. They called the store manager and arranged to collect data for 20 days. The researchers collected data for 4 hours each day
for 20 days and counted the total number of shoppers who did and did not wear a rain jacket. The average number of customers per day who wore a rain jacket during the sample period was 32.
Question 1
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The population in this study was (read each answer and select the best one):
Select one:
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a.
All shoppers in Seattle.
b.
All people who wear rain jackets.
c.
All shoppers at the Seattle Food Store.
d.
All shoppers at the Seattle Food Store during the study period.
e.
The 32 people per day who wore rain jackets to the Seattle Food Store.
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Your answer is correct.
The correct answer is: All shoppers at the Seattle Food Store.
Question 2
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The sample in this survey was:
Select one:
a.
Dominique and Huong.
b.
The people who were observed shopping at the Seattle Food Store during the study.
c.
The people who wear rain jackets.
d.
The four hours per day that were studied.
e.
The 32 people per day who wore rain jackets to the Seattle Food Store.
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Your answer is correct.
The correct answer is: The people who were observed shopping at the Seattle Food Store during the study.
Question 3
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How would you describe the possibility that the sample was biased (read all answers and select the best one):
Select one:
a.
There is no bias because the sample was large.
b.
There is no bias because the multiple days were sampled.
c.
There could be bias because the selected days might not be representative of all the days (such as changing weather).
d.
Not enough information to determine the answer.
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Your answer is correct.
The correct answer is: There could be bias because the selected days might not be representative of all the days (such as changing weather).
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Use this information for the next four questions: Researchers wanted to know about a standardized test that was used across the country. To get an estimate of the answer, they collected data from two classrooms of students who completed the test.
Scores from Classroom A:
8, 6, 9, 9, 8, 7, 8, 9, 10, 8, 10, 5, 4, 10, 9, 9
Scores from Classroom B:
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9, 8, 7, 8, 9, 10, 9, 10, 7, 8, 10, 9, 9, 4, 6, 3
Question 4
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The set of all scores on the standardized test across the country is:
Select one:
a.
a statistic
b.
a parameter
c.
the sample
d.
the population
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The correct answer is: the population
Question 5
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When all the scores for the two classrooms are added and divided by the number of observations, the resulting value is a:
Select one:
a.
a statistic
b.
a parameter
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c.
the sample
d.
the population
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The correct answer is: a statistic
Question 6
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What is the mean score in Group A?
Select one:
a.
8.4375
b.
8.3125
c.
8.0625
d.
8.375
e.
8.4375 / sqrt(n)
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Your answer is correct.
The correct answer is: 8.0625
Question 7
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Load data for Group B into an R object called B, then run this command:
barplot(table(B))
What does the bar on the right represent?
Select one:
a.
Nine students received a score of 5 on the quiz.
b.
One student received a score of 6 on the quiz.
c.
Three students received a score of 7 on the quiz.
d.
Four students received a score of 9 on the quiz.
e.
Three students received a score of 10 on the quiz.
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The correct answer is: Three students received a score of 10 on the quiz.
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Eighty adults with gum disease were asked the number of times per day they fossed. The (incomplete)
results are shown below:
# per day
Freq. Rel. Freq
Cum. Rel. Freq
0
15
.1875
1
21
.2625
2
18
.2250
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3
.7875
4
9 .9000
5
8 1.000
Fill in the blanks in the table and answer the next two question:
Question 8
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The count of people who fossed three times per day is:
Select one:
a.
11
b.
18
c.
12
d.
9
e.
can not be determined
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The correct answer is: 9
Question 9
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The cumulative relative frequency of those who fossed 0 to 2 times per day is:
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Select one:
a.
.2250
b.
.7875
c.
.6750
d.
.1875
e.
0.000
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The correct answer is: .6750
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Use this information for the next six questions:
category <- c('a', 'g', 'd', 'a', 'd', 'g', 'g', 'd')
speed <- c(60, 83.3, 71, 64.4, 75, 90, 87, 73)
Question 10
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The data type of the category object is:
Select one:
a.
numeric
b.
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factor
c.
complex
d.
mixed
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The correct answer is: factor
Question 11
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The data type of the speed object is:
Select one:
a.
numeric
b.
factor
c.
complex
d.
mixed
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Your answer is correct.
The correct answer is: numeric
Question 12
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What is the mean of the category object?
Select one:
a.
'a'
b.
'd'
c.
'g'
d.
between 'd' and 'g'
e.
none of the above
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The correct answer is: none of the above
Question 13
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What is the mean of speed (rounded to 1 decimal place)?
Select one:
a.
75.5
b.
90.0
c.
60.0
d.
74.0
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Your answer is correct.
The correct answer is: 75.5
Question 14
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What is the sample standard deviation of the speed data (rounded to 1 decimal place)?
Select one:
a.
113.4
b.
74.5
c.
10.6
d.
90.0
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The correct answer is: 10.6
Question 15
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What is the minimum value of the speed data:
Select one:
a.
15.1
b.
60.0
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c.
74.0
d.
14.9
e.
30.0
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The correct answer is: 60.0
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Some researchers collected data on the number of pairs of shoes that students own. Five students owned seven pairs, two students owned no pairs, and various students owned between one and fve pairs of shoes. See the data in the frequency table:
Shoes owned
0
1
2
3
4
5
7
Frequency
2
4
20
8
6
4
5
Question 16
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What is the mean of the number of pairs of shoes that the students owned?
Select one:
a.
3.0
b.
3.1
c.
2.6
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d.
2.9
e.
2.2
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Your answer is correct.
The correct answer is: 3.0
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