Question

4)

Assume that IQ scores of college graduates are normally distributed. A researcher collects a random sample of 21 college graduates and tests their IQ. The sample had a mean IQ of 109 with a standard deviation of 15.1.

a) Find a 95% confidence interval for the true mean IQ for college graduates.

b) Provide the **margin of error** of the interval
as your answer.

**Round your answer to 1 decimal place.**

Answer #1

3)
Assume that IQ scores of college graduates are normally
distributed. A researcher collects a random sample of 25 college
graduates and tests their IQ. The sample had a mean IQ of 106.5
with a standard deviation of 15.7.
a) Find a 95% confidence interval for the true mean IQ for
college graduates.
b) Provide the right endpoint of the interval
as your answer.
Round your answer to 1 decimal place.

Suppose you know that the IQ scores of all incoming college
freshman are normally distributed with standard deviation of 15.
You have a simple random sample of 100 freshmen, and the mean IQ
score for this sample is 120. Find a 90-percent confidence interval
for the mean IQ score for the entire population of incoming college
freshmen

Scores on an IQ test are normally distributed. A sample of 12 IQ
scores had standard deviation s=6 (a) Construct a 95% confidence
interval for the population standard deviation σ. Round the answers
to at least two decimal places. (b) The developer of the test
claims that the population standard deviation is σ=7 Does this
confidence interval contradict this claim? Explain.

Scores on IQ test are normally distributed. A sample
of 14 IQ scores had standard deviation s=6. Construct a 99%
confidence interval for the population standard deviation. The
developerof the test claims that the population standard deviation
is =7. Does this confidence interval contradict this claim?

Scores on an IQ test are normally distributed. A sample of 5 IQ
scores had standard deviation s=8. (a) Construct a 90% confidence
interval for the population standard deviation . Round the answers
to at least two decimal places. (b) The developer of the test
claims that the population standard deviation is 15. Does this
confidence interval contradict this claim? Explain.

Assume that adults have IQ scores that are normally distributed
with a mean of 102.9 and a standard deviation of 15.1 Find the
probability that a randomly selected adult has an IQ greater than
119.8

A) Assume that adults have IQ scores that are normally
distributed with a mean of 100 and a standard deviation of 15. Find
the probability that a randomly selected adult has an IQ between 90
and 120. (Provide graphing calculator sequence)
B) Assume that adults have IQ scores that are normally
distributed with a mean of 100 and a standard of 15. Find P3D,
which is the IQ score separating the bottom 30% from the top 70%.
(Provide graphing calculator...

The Stanford-Binet IQ test has scores that are normally
distributed with a mean of 100. A principal in an elementary school
believes that her students have above average intelligence and
wants verification of her belief. She randomly selects 20 students
and checks the student files. She finds the following IQ scores for
these 20 students. IQ scores: 110,132, 98, 97, 115, 145, 77, 130,
114, 128, 89, 101, 92, 85, 112, 79, 139, 102, 103, 89
a. Compute the sample...

assume that test scores are normally distributed. A random
sample of 25 SAT scores has a mean 1120 with a standard deviation
190. If (a,b) is the 95% confidence interval for the mean of all
SAT scores constructed based on this sample, then, to the nearest
whole number, a= b=

2. A random sample of 12 recent college graduates reported an
average starting salary of $54,000 with a standard deviation of
$6,000.
To construct a 95% confidence interval for the mean starting
salary of college graduates, what will be the margin of error?
Round to whole dollars.

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