Question

In a study of Math SAT scores done in 2010, the investigators
computed the average Math SAT score ( Ai )in each of the 50 states and D.C.
and the percentage ( P_{i} )of high school seniors in each
state that took the test that year. They found that the correlation
between the variables A and P was r = -0.77.

(a) Does this mean that the test scores were better on average
in states where fewer a lower percentage of students took the test?
Answer * yes* or

(b) The average Math SAT score in NY was 515 in 2010, while in
Montana, the average score was 603. Does this mean that Montana
does a better job preparing students for the Math SAT exam than NY
state? Answer * yes* or

Answer #1

A)

a)

When the correlation is negative, it means they are negatively related. When one increases, other decrease and vice-versa.

When a less number of students took the test, then the average was more, This is what can be concluded from a negative correlation.

Yes is the answer.

b)

Here, it doesn't talk about the preparation at all.

If the score is high, it means there were less number of students and vice-versa. Saying that NY students prepared less as compared to Montana student because they got the less average marks won't be appropriate here.

No is the answer.

In a study of Math SAT scores done in 2010, the investigators
computed the average Math SAT score ( Ai )in each of the 50 states
and D.C. and the percentage ( Pi ) of high school
seniors in each state that took the test that year. They found that
the correlation between the variables A and P was r = -0.77.
(a) Does this mean that the test scores were better on average
in states where fewer a lower...

In a study of Math SAT scores done in 2010, the investigators
computed the average Math SAT score ( A i )in each of the 50 states
and D.C. and the percentage ( P i )of high school seniors in each
state that took the test that year. They found that the correlation
between the variables A and P was r = -0.77.
(a) Does this mean that the the test scores were better on
average in states where fewer...

In a study of Math SAT scores done in 2010, the investigators
computed the average Math SAT score ( A i )in each of the 50 states
and D.C. and the percentage ( P i )of high school seniors in each
state that took the test that year. They found that the correlation
between the variables A and P was r = -0.77.
(a) Does this mean that the the test scores were better on
average in states where fewer...

Suppose that the national average for the math portion of the
College Board's SAT is 515. The College Board periodically rescales
the test scores such that the standard deviation is approximately
100. Answer the following questions using a bell-shaped
distribution and the empirical rule for the math test scores.
If required, round your answers to two decimal places. If your
answer is negative use “minus sign”.
(a)
What percentage of students have an SAT math score greater than
615?
(b)...

A certain test preparation course is designed to improve
students' SAT Math scores. The students who took the prep course
have a mean SAT Math score of 507 while the students who did not
take the prep course have a mean SAT Math score of 501. Assume that
the population standard deviation of the SAT Math scores for
students who took the prep course is 45.7 and for students who did
not take the prep course is 32.1 The SAT...

A certain test preparation course is designed to improve
students' SAT Math scores. The students who took the prep course
have a mean SAT Math score of 507 while the students who did not
take the prep course have a mean SAT Math score of 501. Assume that
the population standard deviation of the SAT Math scores for
students who took the prep course is 45.7 and for students who did
not take the prep course is 32.1 The SAT...

Suppose that the national average for the math portion of the
College Board's SAT is 512. The College Board periodically rescales
the test scores such that the standard deviation is approximately
100. Answer the following questions using a bell-shaped
distribution and the empirical rule for the math test scores.
If required, round your answers to two decimal places. If your
answer is negative use “minus sign”.
(a)
What percentage of students have an SAT math score greater than
612?
%...

Suppose that the national average for the math portion of the
College Board's SAT is 514. The College Board periodically rescales
the test scores such that the standard deviation is approximately
75. Answer the following questions using a bell-shaped distribution
and the empirical rule for the math test scores. If required, round
your answers to two decimal places. (a) What percentage of students
have an SAT math score greater than 589? % (b) What percentage of
students have an SAT...

Suppose that the national average for the math portion of the
College Board's SAT is 547. The College Board periodically rescales
the test scores such that the standard deviation is approximately
75. Answer the following questions using a bell-shaped distribution
and the empirical rule for the math test scores.
If required, round your answers to two decimal places.
(a)
What percentage of students have an SAT math score greater than
622?
%
(b)
What percentage of students have an SAT...

A certain test preparation course is designed to improve
students' SAT Math scores. The students who took the prep course
have a mean SAT Math score of 504 with a standard deviation of
38.5, while the students who did not take the prep course have a
mean SAT Math score of 492 with a standard deviation of 43.5. The
SAT Math scores are taken for a sample of 78 students who took the
prep course and a sample of 85...

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 2 minutes ago

asked 24 minutes ago

asked 34 minutes ago

asked 43 minutes ago

asked 43 minutes ago

asked 46 minutes ago

asked 1 hour ago

asked 1 hour ago

asked 2 hours ago

asked 2 hours ago

asked 2 hours ago

asked 2 hours ago