Question

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 was 80 and the mean of the 19 readable scores is 82, what
is the value of the unreadable score?

Answer #1

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...

The students who took Mrs. Johnson's math quiz scored a
mean of 51 with a variance of 46. Since the scores were low, Mrs.
Johnson decided to curve the scores. If Peter had an original score
of 32 and a curved score of 68, and Rachel had an original score of
86 and a curved score of 95, what is the sum of the mean and
standard deviation of the new score distribution? Round to the
nearest thousandth.

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?

2.27 Make-up exam: In a class of 27 students,
26 of them took an exam in class and 1 student took a make-up exam
the following day. The professor graded the first batch of 26 exams
and found an average score of 84 points with a standard deviation
of 7 points. The student who took the make-up the following day
scored 64 points on the exam.
a) Does the new student's score increase or decrease the
average?
Increases
Decreases
b)...

Todd is a high school student who just took the SAT. The
following are his SAT scores for Math and Critical Reading, along
with the overall mean and standard deviation for the students who
took the test in the same year. The overall test scores are
Normally distributed. Which of the following statements is
false?
Score Mean Standard Deviation Critical Reading 521 495 116 Math
535 511 120
a. In comparison to the other students, Todd performed better on
the...

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.

Let us assume that there are 16 students who took the SAT in
your class. The 16 students’ SAT score average was 1350. Find the
probabilities of the followings.
What is the probability that MEAN score of the 16 students is
higher than 1350? (0.7% of your grade)
The number of students increased to 25 from 16. How the answer
for 3 changes? (0.7% of your grade)

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.

AM -vs- PM sections of Stats - Significance test (Raw
Data, Software Required):
There are two sections of statistics, one in the afternoon (PM)
with 30 students and one in the morning (AM) with 22 students. Each
section takes the identical test. The PM section, on average,
scored higher than the AM section. The scores from each section are
given in the table below. Test the claim that the PM section did
significantly better than the AM section, i.e., is...

forty students took a test on which the mean score was an 82 and
standard deviation was 7.8. the distribution of the scores followed
a normal model and a grade of B or better was assigned to all
students who scored 85 or higher. approximately how many grades of
B or better were given? (choose closest answer) (a) 8, (b) 10, (c)
14, (d) 28, (e) 35

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 2 minutes ago

asked 4 minutes ago

asked 5 minutes ago

asked 9 minutes ago

asked 11 minutes ago

asked 11 minutes ago

asked 20 minutes ago

asked 27 minutes ago

asked 28 minutes ago

asked 43 minutes ago

asked 52 minutes ago

asked 52 minutes ago