Question
2. The principal randomly selected six students to take an aptitude test. Their scores (from a...
2. The principal randomly selected six students to take an aptitude test. Their scores (from a normal distribution) were:
83.0 84.1 83.5 83.7 84.1 73.5
a. Determine a 90 percent confidence interval for the mean score for all students. Show all work. Identify the standard error, and all calculations of the margin of error. Does it appear as if the mean score was better than 84? Write the findings as you would in a report (interpret the interval.)
b.Assume now that sigma was known to be 4.17. What is the confidence interval for the mean score? Show your work. How is it different above? Why?
Homework Answers
Answer #1
Not the answer you're looking for?
Similar Questions
the national average for the 7th grade aptitude test in 2004 was 85. The principal at...
the national average for the 7th grade aptitude test in 2004 was
85. The principal at O'Farrell Middle School feels that the averagr
for his students this year will be different. He randomly selected
10 students to take the aptitude test. Their scores were: 83.4 72.1
89.2 83.3 85.9 79.2 80.3 88.5 90.1
1- state the sample mean and mean and sample standard
deviation.
2- Determine 95% confidence interval
3- Does this confidence interval suggest that the average score
of...
thirty-one randomly selected students scores on the test in MTH 243 were recorded. This sample had...
thirty-one randomly selected students scores on the test in MTH
243 were recorded. This sample had a mean of 73 and a standard
deviation of 8.4. Construct a 98% confidence interval for the mean
score of all students MTH 243 test score. (round all values to
three decimal places)
Does this sample satisfy the conditions for constructing a
confidence interval?
Select an answer Yes No Why do you keep asking these questions of
me?
What critical value is appropriate for...
16 students were randomly selected from a large group of students taking a certain calculus test....
16 students were randomly selected from a large group of
students taking a certain calculus test. The mean score for the
students in the sample was 86 and the standard deviation was 1.3.
Assume that the scores are normally distributed. Construct a 98%
confidence interval for the mean score, μ, of all students taking
the test. Round your answer to two decimal places.
Randomly selected students participated in an experiment to test their ability to determine when one minute...
Randomly selected students participated in an experiment to test
their ability to determine when one minute (or sixty seconds) has
passed. Forty students yielded a sample mean of 59.7 seconds.
Assuming that sigma =10.1 seconds, construct and interpret a 90%
confidence interval estimate of the population mean of all
students.
What is the 90% confidence interval for the population mean
μ?
16 students were randomly selected from a large group of students taking a certain calculus test....
16 students were randomly selected from a large group of
students taking a certain calculus test. The mean score for the
students in the sample was 86 and the standard deviation was 1.2.
Assume that the scores are normally distributed. Construct a 98%
confidence interval for the mean score, μ, of all students taking
the test. Round your answer to two decimal places.
a- (85.30 , 86.70)
b- (85.22 , 86.78)
c- (85.36 , 86.64)
d- (85.28 , 86.72)
the test scores of 12 randomly selected students in a class are 85, 79, 84, 94,...
the test scores of 12 randomly selected students in a class are
85, 79, 84, 94, 96, 78, 88, 91, 76, 99, 95, and 81. Assume the
scores follow a normal distribution, calculate 90% confidence
interval for the standard deviation of the scores for the class.
(sample variance = 60.88)
A group of 51 randomly selected students have a mean score of 29.5 with a sample...
A group of 51 randomly selected students have a mean score of
29.5 with a sample standard deviation of 5.2 on a placement test.
What is the 95% confidence interval for the
mean score, μ, of all students taking the test?
Critical error=
Margin of error=
confidence interval=
The data set represents the scores of 12 randomly selected students on the SAT Physics Subject...
The data set represents the scores of 12 randomly selected
students on the SAT Physics Subject Test. Assume the population
test scores are normally distributed and the population standard
deviation is 103. (Adapted from The College Board) 670 740 630 620
730 650 720 620 640 500 670 760
(a) Find the point estimate of the population mean.
(b) Construct a 90% confidence interval for the population mean.
Interpret the results.
(c) Determine the minimum sample size required to be...
A principal claims the students in his school have above-average test scores for a particular standardized...
A principal claims the students in his school have above-average
test scores for a particular standardized test.
A sample of 50 students from his school were found to have an
average test score of 77.2.
The population mean for test scores for this particular test is
75, with a standard deviation of 9 (so we can assume that the
population test score is normally distributed).
Set up a hypothesis test to determine whether this principal’s
claim is correct (use alpha...
The scores for the test # 3 for Abe’s stat class from 9 randomly selected students...
The scores for the test # 3 for Abe’s stat class from 9 randomly
selected students are as such 86 ,70, 95, 90, 77, 88, 85, 92, 90.
By using 95% confidence level, find the confidence interval for the
average test score for test # 3 for all Abe’s stat class.
7) A) E =5.85 B) E = 6.28 C) E =6.02 D) E = 5.89
8) A) 79.87 < < μ 91.91 B) 83.24 < < μ 121.27 C)...
ADVERTISEMENT
Need Online Homework Help?
Get Answers For Free
Most questions answered within 1 hours.
ADVERTISEMENT
Active Questions
asked 4 minutes ago
asked 7 minutes ago
asked 10 minutes ago
asked 12 minutes ago
asked 21 minutes ago
asked 31 minutes ago
asked 1 hour ago
asked 1 hour ago
asked 1 hour ago
asked 1 hour ago
asked 1 hour ago
asked 1 hour ago