Question
In: Statistics and Probability
A teacher believes that the third homework assignment is a key predictor in how well students...
A teacher believes that the third homework assignment is a key predictor in how well students will do on the midterm. Let x represent the third homework score and y the midterm exam score. A random sample of last terms students were selected and their grades are shown below. Assume scores are normally distributed.
| HW3 | Midterm |
| 13.3 | 59.811 |
| 21.9 | 87.539 |
| 9.7 | 53.728 |
| 25 | 96.283 |
| 5.4 | 39.174 |
| 13.2 | 66.092 |
| 20.9 | 89.729 |
| 18.5 | 78.985 |
| 20 | 86.2 |
| 15.4 | 73.274 |
| 25 | 93.25 |
| 9.7 | 52.257 |
| 6.4 | 43.984 |
| 20.2 | 79.762 |
| 21.8 | 84.258 |
| 23.1 | 92.911 |
| 23 | 87.82 |
| 11.4 | 45.034 |
| 14.9 | 71.869 |
| 18.4 | 76.704 |
| 15.1 | 60.431 |
| 15 | 65.15 |
| 16.8 | 77.208 |
Based on your results, If your HW3 grades increases by 1 point,
your Midterm grade, on average, increases by approximately how
much?
Place your answer, rounded to 3 decimal places, in the blank. Do
not use any stray punctuation marks or a dollar sign. For example,
34.567 would be a legitimate entry.
Solutions
orchestra answered 2 years agoRelated Solutions
A teacher believes that the third homework assignment is a key predictor in how well students...
A teacher believes
that the third homework assignment is a key predictor in how well
students will do on the test. Let x represent the third homework
score and y the test score. A random sample of last terms students
were selected and their grades are shown below. Assume scores are
normally distributed.
HW3
term
13.3
59.811
21.9
87.539
9.7
53.728
25
96.283
5.4
39.174
13.2
66.092
20.9
89.729
18.5
78.985
20
86.2
15.4
73.274
25
93.25
9.7
52.257
6.4...
A teacher believes that the third homework assignment is a key predictor in how well students...
A teacher believes that the third homework assignment is a key
predictor in how well students will do on the test. Let x represent
the third homework score and y the test score. A random sample of
last terms students were selected and their grades are shown below.
Assume scores are normally distributed.
HW3
Test
13.3
59.811
21.9
87.539
9.7
53.728
25
96.283
5.4
39.174
13.2
66.092
20.9
89.729
18.5
78.985
20
86.2
15.4
73.274
25
93.25
9.7
52.257
6.4...
A teacher believes that the third homework assignment is a key predictor in how well students...
A teacher believes that the third homework assignment is a key
predictor in how well students will do on the midterm. Let x
represent the third homework score and y the midterm exam score. A
random sample of last terms students were selected and their grades
are shown below. Assume scores are normally distributed.
HW3
Midterm
13.3
59.811
21.9
87.539
9.7
53.728
25
96.283
5.4
39.174
13.2
66.092
20.9
89.729
18.5
78.985
20
86.2
15.4
73.274
25
93.25
9.7
52.257...
A history teacher believes that students in an afternoon class score higher than the students in...
A history teacher believes that students in an afternoon class
score higher than the students in a morning class. The results of a
special exam are shown below. Can the teacher conclude that the
afternoon students have a higher score? Use α = 0.01. Morning
Students Afternoon Students
n1 = 36 n2 = 41 x1= 83
x2 = 86 s1 = 5.8 s2 = 6.3
null hypothesis
and t statistic , p value
In a population of students, 60% study for every homework assignment. A sample of 40 students...
In a population of students, 60% study for every homework
assignment. A sample of 40 students from this population is taken,
and the number who study for every homework assignment from this
sample is recorded as the random variable X.
a) (4 pts) Verify that X has a binomial distribution.
b) (4 pts) Find the probability that exactly 25 students from
the sample study for the exam.
c) (4 pts) Find the mean for this binomial experiment
4. A teacher believes that whatever he says in class has no effect on his students....
4. A teacher believes that whatever he says in class has no
effect on his students. Just as he's about to quit his profession,
a statistician enters the room and suggests that the teacher design
a study to test his assumption. The study will look at whether
providing in-class feedback on homework assignments enhances
classroom performance. The teacher wants to know whether providing
feedback before or after returning the assignments is most useful.
He's also interested in the most effective...
3. A teacher believes that a new method will improve students’ reading ability. For 8 weeks,...
3. A teacher believes that a new method will improve students’
reading ability. For 8 weeks, she teaches a class of 21 students
using these new methods. Meanwhile a colleague uses “traditional”
methods to teach his 23 students. At the end of the 8 weeks, all
the students are given the Degree of Reading Power Test. Here are
the scores:
New
Method students
24
43
58
71
43
49
61
44
67
49
53
56
59
52
62
54
57...
A history teacher believes that students in an afternoon class have a higher mean score than...
A history teacher believes that students in an afternoon class
have a higher mean score than the students in a morning class. The
teacher randomly selected 41 students from her afternoon class and
found that the mean score was a 99 with standard deviation of 6.3.
The teacher randomly selected 36 students from her morning class
and found that the mean score was a 96 with a standard deviation of
5.8. Can the teacher conclude that the afternoon students have...
A certain stat teacher believes that her students should do at least an average of 5...
A certain stat teacher believes that her students should do at
least an average of 5 hours of homework in a week. She took a
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A teacher is comparing the mean study time of his freshmen and senior students. he believes...
A teacher is comparing the mean study time of his freshmen and
senior students. he believes that his senior students spend more
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a. suppose the decision of the hypothesis test is to reject the
null hypothesis. If in reality freshmen study for a mean of 10
hours per week and seniors study for a mean of 15 hours per week,
was an...
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