Question

- Using R, answer the following question. The accompanying data
set contains quiz scores for 12 students in a chemistry class: 18,
15, 5, 8, 15, 20, 2, 16, 10, 12, 20, 15.
- Find a measure of central tendency that separates the data into two groups such that each group consists of 50% of the scores above and 50% of the scores below that measure.
- Find a measure of central tendency that represents the average of the 12 quiz scores.
- Find the standard deviation and variance for this dataset.

Answer #1

Here is the data set for quiz scores for the students who enroll
the Economics 101.
13
14
14
17
15
18
14
18
19
19
20
20
22
22
23
13
9
11
14
14
16
Using the five number summary, describe (1) the shape, (2)
appropriate central tendency, (3) appropriate dispersion method,
& (4) any extreme value of the data.

The following data set represents students' scores on a
quiz. The best possible score was a 20. Use the data to generate
answers to the next eight (8) questions (Q28-Q35).
4, 4, 10, 12, 2, 20, 5, 12, 12, 5, 9, 9, 20, 13, 6, 6,
15, 15, 15, 15
What is the mean? (Round all answers for this question to the
hundredths place - X.XX)
What is the median?
What is the mode?
What is the range?
What is...

Here is the data set for quiz scores for the students who enroll
the Economics 101.
13
14
14
17
15
18
14
18
19
19
20
20
22
22
23
13
9
11
14
14
16
Find the median score of this quiz.

Here is the data set for quiz scores for the students who enroll
the Economics 101.
13
14
14
17
15
18
14
18
19
19
20
20
22
22
23
13
9
11
14
14
16
In last semester, the average score for the same quiz was 18.1.
With 90% confidence, what conclusion can be reached about how the
true current mean score compares to last year?

The following is data for the first and second Quiz scores for 8
students in a class.
First Quiz Second Quiz
12 8
13 14
23 17
35 31
40 33
42 40
49 40
50 41
Predict the value of the second quiz score if a student had a
score of 44 on the first test.

The following data set contains the English scores for a sample
of grade eleven students. 530 350 510 410 440 420 430 390 550 520
440 500 430 480 420 480 360 480 370 360 The following data set
contains the scores of a mathematics test for a sample of grade
eleven students. 33 22 20 27 28 20 31 25 25 20 20 28 20 24 25 29 24
24 26 30
Which measure would you use to compare...

The following is data for the first and second Quiz scores for 8
students in a class.
First Quiz
Second Quiz
10
12
11
13
19
17
24
18
25
19
34
34
44
38
47
41
Plot the points in the grid below.
51015202530354045505101520253035404550
Clear All Draw: Dot
Draw the best fitting trend line for the data on the grid
below.
For line click on the line button. Click and release at a starting
point, move to the ending...

The following data are quiz scores for two quizzes from 8
students in a class.
First Quiz
Second Quiz
10
12
11
13
13
15
15
19
29
27
33
28
35
29
40
38
Least-squares Regression Line
1) What is the least-squares regression line? Round to three
decimal places.
ˆy=
2) Prediction
Predict the score of the second quiz if a student scored 49 on
the first quiz. Round to one decimal place.
=

1. The following data is a list of quiz scores
from a recent Stats quiz:
19, 15, 19, 16, 10, 18, 17,
16, 19, 17, 20, 19
What is the most appropriate measure of
center/spread for this data?
What score would receive a grade of D based on your choice in
a?
Are there any outliers in this data. Give your
reasoning.

1. The following set of data lists the number of text messages
sent per day in a sample of college students and a sample of their
parents. College students: 43, 12, 14, 13, 54, 7, 50, 15, 21, 21
Parents: 24, 0, 20, 21, 3, 21, 17, 19, 5, 10 Compute the mean,
median, mode and sum of squares for each group
2. Compute the range, variance and standard deviation for each
group
3. Under what circumstances would the median...

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