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MATLAB: An Introduction with Applications
6th Edition
ISBN: 9781119256830
Author: Amos Gilat
Publisher: John Wiley & Sons Inc
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Question
Suppose the
Margin of error at 90% confidence level =
90% confidence interval =
![Suppose the mean height in inches of all 9th grade students at one high school is
estimated. The population standard deviation is 5 inches. The heights of 9
randomly selected students are 66, 70, 68, 73, 65, 66, 68, 67 and 68.
=
Ex: 12.34€
Margin of error at 90% confidence level = Ex: 1.23€
90% confidence interval = [Ex: 12.34 Ex: 12.34]
[smaller value, larger value]](https://content.bartleby.com/qna-images/question/f754e220-427d-4413-9e56-39a756e77625/5f706a8e-d8df-46f0-b347-509aa4d08cad/ypezbe_thumbnail.png)
Transcribed Image Text:Suppose the mean height in inches of all 9th grade students at one high school is
estimated. The population standard deviation is 5 inches. The heights of 9
randomly selected students are 66, 70, 68, 73, 65, 66, 68, 67 and 68.
=
Ex: 12.34€
Margin of error at 90% confidence level = Ex: 1.23€
90% confidence interval = [Ex: 12.34 Ex: 12.34]
[smaller value, larger value]
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- When 77 campers are randomly selected and surveyed, it was found that the average number that prefer to camp at the beach was 16. Assume the population standard deviation is 2.3. Construct a 90% confidence interval for the true population mean of the number of campers who prefer to camp at the beach. Give your answers to 3 decimal places. Error =arrow_forward9a) Researchers obtained the body temperature of 52 healthy humans and found the average body temperature of these 52 people to be 98.4°F. Construct a 90% confidence interval for the population mean body temperature of healthy humans. Assume the population standard deviation is 0.97°F. Interpret your result.arrow_forwardThe average weight of 31 randomly selected minivans was 4150 pounds. The sample standard deviation was 480 pounds. Find the 99 percent confidence interval of the true population mean weight of minivans.arrow_forward
- What is the minimum required sample size to make a 96% confidence interval for a population mean if the margin of error is to be 2 inches and the standard deviation is thought to be about 12 inches?arrow_forwardSuppose the mean height in inches of all 9th grade students at one high school is estimated. The population standard deviation is 3 inches. The heights of 6 randomly selected students are 71, 73, 69, 72, 71 and 64. x= Margin of error at 99%= confidence level = 99% confidence interval = [smaller value, larger value]=arrow_forwardAssume that the square footage of a residential house in the US is normally distributed with a mean=1000 and standard deviation=150 square feet. Suppose we select 450 houses from a town and we find that the mean of those houses is 1230 square feet (the standard deviation remains the same). What is the 95% confidence interval for this sample? from 1216 to 1244 from 1250 to 1320 from 1126 to 1294 from 1038 to 1420arrow_forward
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