Question

The national average SAT score is 1070. If we assume a normal distribution with a standard deviation of 90. What is the probability that a randomly selected sample of size 8 has a mean score greater than 1150?

Answer #1

The average teacher’s salary is $45,000. Assume a normal
distribution with standard deviation equal to $10,000. a) What is
the probability that a randomly selected teacher makes greater than
$65,000 a year? b) If we sample 100 teachers’ salaries, what is the
probability that the sample mean will be greater than $65,000?

[5] 3. The
average teacher’s salary is $45,000. Assume a normal distribution
with standard
deviation equal to $10,000.
What is the probability that a randomly selected teacher makes
greater than $65,000 a year?
If we sample 100 teachers’ salaries, what is the probability
that the sample mean will be greater than $65,000?

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...

The national average SAT score for reading is 450 and the
standard deviation is 55. SAT scores are normally distributed.
Q : What do you have to score to perform better than 90% of test
takers?

Use the normal distribution of SAT critical reading scores for
which the mean is
510
and the standard deviation is
111
Assume the variable x is normally distributed.
a)
What percent of the SAT verbal scores are less than
625?
(b)
If 1000 SAT verbal scores are randomly selected, about how
many would you expect to be greater than
525?

Use the normal distribution of SAT critical reading scores for
which the mean is 506 and the standard deviation is 125.
Assume the variable x is normally distributed
A)
What percent of the SAT verbal scores are less than
650?
B)
If 1000 SAT verbal scores are randomly selected, about how
many would you expect to be greater than
525?

Use the normal distribution of SAT critical reading scores for
which the mean is 503 and the standard deviation is 112. Assume the
variable x is normally distributed. (a) What percent of the SAT
verbal scores are less than 650? ( b) If 1000 SAT verbal scores
are randomly selected, about how many would you expect to be
greater than 575?
(a) Approximately nothing% of the SAT verbal scores are less
than 650. (Round to two decimal places as needed.)...

Math SAT: Suppose the national mean SAT score
in mathematics was 515. In a random sample of 40 graduates from
Stevens High, the mean SAT score in math was 508, with a standard
deviation of 35. Test the claim that the mean SAT score for Stevens
High graduates is the same as the national average. Test this claim
at the 0.10 significance level.
(a) What type of test is this?
This is a left-tailed test.This is a two-tailed
test. This is...

Math SAT: Suppose the national mean SAT score
in mathematics was 505. In a random sample of 40 graduates from
Stevens High, the mean SAT score in math was 495, with a standard
deviation of 30. Test the claim that the mean SAT score for Stevens
High graduates is the same as the national average. Test this claim
at the 0.01 significance level.
(a) What type of test is this?
This is a left-tailed test.
This is a right-tailed test. ...

Math SAT: Suppose the national mean SAT score
in mathematics was 505. In a random sample of 60 graduates from
Stevens High, the mean SAT score in math was 510, with a standard
deviation of 30. Test the claim that the mean SAT score for Stevens
High graduates is the same as the national average. Test this claim
at the 0.10 significance level.
(a) What type of test is this?
This is a left-tailed test.This is a two-tailed
test. This is...

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