Question

Imagine that 41 randomly selected Miramar students are asked to measure the length of one of their feet. Suppose that the sample mean foot length (x) turns out to be 23.4 centimeters and that the sample standard deviation of the foot lengths turns out to be 5.1 centimeters. Find a 95% confidence interval for µ, the mean foot length among all Miramar students. Would you expect about 95% of all Miramar students to have foot lengths within this interval? Explain.

Answer #1

A sample of 14 randomly selected students have a sample mean
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placement test. Construct a 95% confidence interval for the mean
score, !, of all students taking the test.

2. You randomly select and measure the lengths of 34
bolts. The sample mean length is 1.24 inches and the standard
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the mean length of all bolts.
Find a point estimate for the mean length of all
bolts
Verify that the conditions are met to construct an
interval of confidence for the mean length of all bolts
Calculate the critical Z value to construct a 94%
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41 female students were randomly sampled. Average SAT
score for selected female students: 1148 out of 1600 points. Sample
standard deviation: 263.7 Average score of all students: 1273. Test
the claim that the female average is less than the average of all
students. Assume sigma is unknown, use alpha = 0.05.

A survey of 200 students is selected randomly on a large
university campus They are asked if they use a laptop in class to
take notes. The result of the survey is that 70 of the 200 students
use laptops to take notes in class.
What is the value of the sample proportion?
What is the standard error of the sampling
proportion?
Construct an approximate 95% confidence interval for the true
proportion by going 2 standard errors from the sampling...

A survey of 200 students is selected randomly on a large
university campus. They are asked if they use a laptop in class to
take notes. Suppose that based on the survey, 120 of the 200
students responded "yes." a) What is the value of the sample
proportion ModifyingAbove p with caret? b) What is the standard
error of the sample proportion? c) Construct an approximate 95%
confidence interval for the true proportion p by taking plus or
minus 2...

A survey of 158 students is selected randomly on a large
university campus. They are asked if they use a laptop in class to
take notes. The result of the survey is that
79 of the 158 students responded "yes." An approximate 95%
confidence interval is (0.422, 0.578). Complete parts a through d
below.
a) How would the confidence interval change if the confidence
level had been 90% instead of 95%?
b) How would the confidence interval change if the...

A survey of 200 students is selected randomly on a large
university campus They are asked if they use a laptop in class to
take notes. The result of the survey is that 70 of the 200 students
use laptops to take notes in class.
What is the value of the sample proportion? (0.5
pts)
What is the standard error of the sampling proportion?
(0.5 pts)
Construct an approximate 95% confidence interval for the true
proportion by going 2 standard...

A survey of 180 students is selected randomly on a large
university campus. They are asked if they use a laptop in class to
take notes. The result of the survey is that 90 of the 180 students
responded "yes". An approximate 98% confidence interval is (0.413,
0.587). Complete parts a through C. a) How would the confidence
interval change if the confidence level has been 95% instead of 98%
b) How would confidence interval change if the sample size...

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=

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?

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