Question
In: Math
An existing inventory for a test measuring self-esteem indicates that the scores have a standard deviation...
An existing inventory for a test measuring self-esteem indicates that the scores have a standard deviation of
10
. A psychologist gave the self-esteem test to a random sample of
100
individuals, and their mean score was
65
. Construct a
99%
confidence interval for the true mean of all test scores. Then complete the table below.
Carry your intermediate computations to at least three decimal places. Round your answers to one decimal place. (If necessary, consult a list of formulas.)
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Solutions
milcah answered 1 year agoRelated Solutions
An existing inventory for a test measuring self-esteem indicates that the scores have a standard deviation...
An existing inventory for a test measuring self-esteem indicates
that the scores have a standard deviation of 8. A psychologist gave
the self-esteem test to a random sample of 60 individuals, and
their mean score was 66. Construct a 95% confidence interval for
the true mean of all test scores. Then complete the table below.
Carry your intermediate computations to at least three decimal
places. Round your answers to one decimal place. (If necessary,
consult a list of formulas.)
What...
The test scores for a math exam have a mean of 72 with a standard deviation...
The test scores for a math exam have a mean of 72 with a
standard deviation of 8.5.
Let the random variable X represent an exam score.
a) Find the probability that an exam score is at most 80.
(decimal answer, round to 3 decimal places)
b) Find the probability that an exam score is at least 60.
(decimal answer, round to 3 decimal places)
c) Find the probability that an exam score is between 70 and 90.
(decimal answer,...
The designer of a 100-point aptitude test wishes test scores to have a standard deviation of...
The designer of a 100-point aptitude test wishes test scores to
have a standard deviation of 10. He gives the test to 25 randomly
selected college students in order to test the null-hypothesis
σ²=100 against the alternative hypothesis σ² ≠ 100 at the level α=
.02. Suppose he found s²= 70. Perform an appropriate hypothesis
test.
A national report indicates that the mean and standard deviation of the ACT scores of incoming...
A national report indicates that the mean and standard deviation
of the ACT scores of incoming freshman at American public
universities are 24.6 and 6.2, respectively. A sample of 41
incoming freshmen at a small, suburban college provide a sample
mean of 22.8 and a sample standard deviation of 7.7. The researcher
is interested in finding evidence at the .05 level that the
standard deviation in ACT scores is greater than the reported value
for all public universities.
. What...
1. The SAT test scores have an average value of 1200 with a standard deviation of...
1. The SAT test scores have an average value of 1200 with a
standard deviation of 100. A random sample of 35 scores is selected
for study.
A) What is the shape, mean(expected value) and standard
deviation of the sampling distribution of the sample mean for
samples of size 35?
B) What is the probability that the sample mean will be larger
than 1235?
C) What is the probability that the sample mean will fall within
25 points of the...
The SAT test scores have an average value of 1200 with a standard deviation of 100....
The SAT test scores have an average value of 1200 with a
standard deviation of 100. A random sample of 35 scores is selected
for the study.
A) What are the shape, mean(expected value) and standard
deviation of the sampling distribution of the sample mean for
samples of size 35?
B) What is the probability that the sample mean will be larger
than 1235?
C) What is the probability that the sample mean will fall within
25 points of the...
1. The SAT test scores have an average value of 1200 with a standard deviation of...
1. The SAT test scores have an average value of 1200 with a
standard deviation of 105. A random sample of 35 scores is selected
for study.
A) What is the shape, mean(expected value) and standard
deviation of the sampling distribution of the sample mean for
samples of size 35?
B) What is the probability that the sample mean will be larger
than 1235?
C) What is the probability that the sample mean will fall
within 25 points of the...
scores on the test are normally distributed with a mean of 76.4 and a standard deviation...
scores on the test are normally distributed with a mean of 76.4 and
a standard deviation of 8.9. round answer nearest whole number.
A. top 90% to 100% of scores
b. scores below the top 90 % and above top 70%
c. scores equal or below 70%and above the bottom 30%
d. scores equal or below 30% snd above bottom 10%
The standard deviation of test scores on a certain achievement test is 11.5. A random sample...
The standard deviation of test scores on a certain achievement
test is 11.5. A random sample of 90 scores on this test had a mean
of 73.6. Based on this sample, find a 90% confidence interval for
the true mean of all scores. Then complete the table below. Carry
your intermediate computations to at least three decimal places.
Round your answer to one decimal place. ( If necessary, consult a
list of formulas.)
What is the lower limit of the...
The standard deviation of test scores on a certain achievement test is 10.9. A random sample...
The standard deviation of test scores on a certain achievement
test is 10.9. A random sample of 60 scores on this test had a mean
of 72.5. Based on this sample, find a 90% confidence interval for
the true mean of all scores. Then complete the table below. Carry
your intermediate computations to at least three decimal places.
Round your answers to one decimal place. (If necessary, consult a
list of formulas.)
What is the lower limit of the
90%...
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