Question

An instructor wishes to see if the SAT score variance of the 23 randomly selected students in her school is less than 10,000. The variance for the 23 test scores is 7225. Test the claim at α=0.05.

The correct CV is _______.

The correct TV is _______.

The correct result summary

Answer #1

41 female students were randomly sampled. Average SAT
score for selected female students: 1148 out of 1600 points. Sample
standard deviation: 263.7 Average score of all students: 1273. Test
the claim that the female average is less than the average of all
students. Assume sigma is unknown, use alpha = 0.05.

An SAT prep course claims to improve the test score of students.
The table below shows the scores for seven students the first two
times they took the verbal SAT. Before taking the SAT for the
second time, each student took a course to try to improve his or
her verbal SAT scores. Do these results support the claim that the
SAT prep course improves the students' verbal SAT scores? Let
d=(verbal SAT scores prior to taking the prep course)−(verbal...

An SAT prep course claims to improve the test score of students.
The table below shows the scores for seven students the first two
times they took the verbal SAT. Before taking the SAT for the
second time, each student took a course to try to improve his or
her verbal SAT scores. Do these results support the claim that the
SAT prep course improves the students' verbal SAT scores? Let
d=(verbal SAT scores prior to taking the prep course)−(verbal...

An SAT prep course claims to improve the test score of students.
The table below shows the scores for seven students the first two
times they took the verbal SAT. Before taking the SAT for the
second time, each student took a course to try to improve his or
her verbal SAT scores. Do these results support the claim that the
SAT prep course improves the students' verbal SAT scores?
Let d=(verbal SAT scores prior to taking the prep
course)−(verbal...

9. An SAT prep course claims to improve the test score of
students. The table below shows the scores for seven students the
first two times they took the verbal SAT. Before taking the SAT for
the second time, each student took a course to try to improve his
or her verbal SAT scores. Do these results support the claim that
the SAT prep course improves the students' verbal SAT scores? Let
d=(verbal SAT scores prior to taking the prep...

7. (10 pts.) The national mean score for the SAT is
910. An SAT preparation program claims that, on average, its
graduates score higher than the national average of 910. To test
the program’s claim, 36 students who have applied to take the SAT
are selected randomly for inclusion in the prep course.
anwsers must be in 4 decimal places
a. What are the hypotheses for the test?
b. Let X be the...

Do students who take SAT coaching classes improve their test
scores? Seven students were selected randomly from all of the
students who completed an SAT coaching class in a given year. For
each student, the first SAT score (before the class) and the second
SAT score (after the coaching class) were recorded. The data is
summarized below:
Student 1 2 3 4 5 6 7 First SAT score 920 820 960 920 1060 860
1010 Second SAT score 1030 800...

10) The SAT scores for 12 randomly selected seniors at a
particular high school are given below. Assume that the SAT scores
for seniors at this high school are normally distributed.
867
1,234
894
1,264
614
861
1,382
968
824
944
702
1,360
a) Find a 95% confidence interval for the true mean SAT score
for students at this high school.
b) Provide the margin of error of the interval
as your answer.
Round your answer to the nearest whole...

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