Question

e SAT and the ACT are the two major standardized tests that colleges use to evaluate candidates. Most students take just one of these tests. However, some students take both. The data data76.dat gives the scores of 60 students who did this. How can we relate the two tests? (a) Plot the data with SAT on the x axis and ACT on the y axis. Describe the overall pattern and any unusual observations. (b) Find the least-squares regression line and draw it on your plot. Give the results of the significance test for the slope. (Round your regression slope and intercept to three decimal places, your test statistic to two decimal places, and your P-value to four decimal places.) ACT = -1.701 Incorrect: Your answer is incorrect. + .024 Correct: Your answer is correct. (SAT) t = 10.60 Incorrect: Your answer is incorrect. P = .0000 Correct: Your answer is correct. (c) What is the correlation between the two tests? (Round your answer to three decimal places.) .892535 Incorrect: Your answer is incorrect.

obs sat act 1 1096 25 2 1065 25 3 940 18 4 1109 26 5 822 15 6 986 23 7 1084 26 8 776 19 9 934 21 10 885 13 11 1142 28 12 930 18 13 734 15 14 857 16 15 1052 30 16 773 15 17 622 16 18 1125 27 19 1057 23 20 536 6 21 940 23 22 942 20 23 841 21 24 996 22 25 1032 21 26 947 23 27 1060 22 28 801 20 29 734 17 30 1071 15 31 669 17 32 815 15 33 844 22 34 892 19 35 965 18 36 857 15 37 1357 29 38 1051 25 39 1130 24 40 1037 18 41 820 16 42 926 21 43 993 24 44 906 22 45 1057 25 46 975 22 47 740 16 48 681 17 49 819 18 50 775 19 51 1165 29 52 967 23 53 512 10 54 954 20 55 818 21 56 727 19 57 927 23 58 945 21 59 879 19 60 980 21

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Answer #1

The SAT and the ACT are the two major standardized tests that colleges use to evaluate candidates. Most students take just one of these tests. However, some students take both. The data data18.dat gives the scores of 60 students who did this. How can we relate the two tests?
(a) Plot the data with SAT on the x axis and ACT on the
y axis. Describe the overall pattern and any unusual
observations.
(b) Find the least-squares regression line and...

The SAT and the ACT are the two major standardized tests that
colleges use to evaluate candidates. Most students take just one of
these tests. However, some students take both. The data data141.dat
gives the scores of 60 students who did this. How can we relate the
two tests? (a) Plot the data with SAT on the x axis and ACT on the
y axis. Describe the overall pattern and any unusual observations.
(b) Find the least-squares regression line and...

The SAT and the ACT are the two major standardized tests that
colleges use to evaluate candidates. Most students take just one of
these tests. However, some students take both. The data data83.dat
gives the scores of 60 students who did this. How can we relate the
two tests?
(a) Plot the data with SAT on the x axis and ACT on the
y axis. Describe the overall pattern and any unusual
observations.
(b) Find the least-squares regression line and...

The SAT and the ACT are the two major standardized tests that
colleges use to evaluate candidates. Most students take just one of
these tests. However, some students take both. The data data29.dat
gives the scores of 60 students who did this. How can we relate the
two tests?
(a) Plot the data with SAT on the x axis and ACT on the
y axis. Describe the overall pattern and any unusual
observations.
(b) Find the least-squares regression line and...

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...

A manufacturing company is purchasing metal pipes of standard
length from two different suppliers, ABC and XYZ. In the past two
months there are increasing complaints by the Production Manager
that delivery times by ABC present higher variability in comparison
to the delivery times by XYZ. The Production Manager is worried
that this variability will make it harder to efficiently schedule
the production process.
Does the sample data indicate a statistically significant
difference at the 5% level? Justify your answer....

A manufacturing company is purchasing metal pipes of standard
length from two different suppliers, ABC and XYZ. In the past two
months there are increasing complaints by the Production Manager
that delivery times by ABC present higher variability in comparison
to the delivery times by XYZ. The Production Manager is worried
that this variability will make it harder to efficiently schedule
the production process. Does the sample data indicate a
statistically significant difference at the 5% level? Justify your
answer....

A manufacturing company is purchasing metal pipes of standard
length from two different suppliers, ABC and XYZ. In the past two
months there are increasing complaints by the Production Manager
that delivery times by ABC present higher variability in comparison
to the delivery times by XYZ. The Production Manager is worried
that this variability will make it harder to efficiently schedule
the production process. If the variance of XYZ remains unchanged,
what should be the variance of ABC in order...

Consider the following data:
25
24
18
20
21
18
16
20
23
17
15
13
19
23
24
20
16
26
21
24
15
22
16
12
20
23
19
26
20
25
21
19
21
25
23
26
21
19
20
14
(a)
Develop a frequency distribution
using classes of 12-14, 15-17, 18-20, 21-23, and 24-26.
Class
Frequency
12-14
15-17
18-20
21-23
24-26
Total
(b)
Develop a relative frequency
distribution and a percent frequency distribution using the classes...

There are two major tests of readiness for college, the ACT and
the SAT. ACT scores are reported on a scale from 1 to 36. The
distribution of ACT scores for more than 1 million students in a
recent high school graduating class was roughly normal with mean μ
= 20.8 and standard deviation σ = 4.8. SAT scores are reported on a
scale from 400 to 1600. The SAT scores for 1.4 million students in
the same graduating class...

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