Question

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?

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
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
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 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 are quiz scores for two quizzes from 8
students in a class.
First Quiz
Second Quiz
16
11
19
14
23
17
32
27
36
28
37
31
38
33
40
40
Least-squares Regression Line
What is the least-squares regression line? Round to three
decimal places.
ˆy=
Prediction
Predict the score of the second quiz if a student scored 39 on
the first quiz. Round to one decimal place.

Two independent samples of tall and short students are selected,
and their scores on a 25 point statistics quiz are recorded as
shown in the table below. What is the rank of Wilt's score? As in
most exams, higher values rank ahead of lower values.
Tall 20 22 17 19 15 18 (Wilt) 13 22 15 17
Short 15 18 22 20 17 22 19 18 20 19
A) 8 B) 12 C) 13 D) 7

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...

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.

A study was conducted to see if students’ writing skills
continue to improve as the academic year progresses. English 101
students were asked to write essays throughout the year in
September, December, March and June. The scores were compared to
see if there is any improvement in this one-year course. Was there
a significant improvement?
The appropriate test for this problem is:
one-way ANOVA
repeated measurements
Student
September
December
March
June
1
17
23
21
24
2
25
21
21...

Assume that Data Set C depicts scores for 30
individuals who participated in a two-way independent groups
design. Analyze the data using a two-way ANOVA and complete an
ANOVA table reporting the relevant DD, df, MS, and Fs. Make sure to
also report each of your critical values and indicate whether you
would reject each of your three null hypotheses (i.e., main effect
of A, main effect of B, interaction of A x B)
Data Set C
Variable B
Variable...

a. Two
sections of a class took the same quiz. Section A had 16 students
who had a mean score of 84, and section B had 20 students who had a
mean score of 90. Overall, what was the mean score for all students
who took the quiz from sections A and B?
b. A
professor has recorded quiz grades for 20 students in his class,
but one of the grades is no longer readable. If the mean score on
the quiz...

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