According to Nielsen//NetRatings, the average visitor to the American Greetings Website spends11.85 minutes at the site. Assuming this finding to be based on a random sample of 20 visitors tothe site, a POPULATION standard deviation of 3.0 minutes, and a population of visiting timesthat is approximately normally distributed, a 95% confidence interval for the population mean isclosest to10.7465 to 12.953510.1226 to 13.577410.5352 to 13.164810.8840 to 12.816010.2870 to 13.4130OnJAARACTERSADWP

The sample size is 20The sample mean is 11.85 minutesThe population standard deviation is 3.0…

Answered: According to Nielsen//NetRatings, the…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Suppose the prices for the iphone 12 are normally distributed with an unknown population mean and a population standard deviation of 75$. A random sample of 50 stores is taken and gives a sample mean price of $850. What are the lower and upper bounds for a 83% confidence interval of the population mean price?
Suppose a sample of 30 students are given an IQ test. The sample has a standard deviation of 12.23 points. Assuming IQ test score follow a normal distribution, suppose the researcher wishes to obtain a 90% confidence interval for the population standard deviation.
The mean length of 25 newly hatched iguanas is 7.47 inches with a standard deviation of 0.77 inches. Assume that the lengths of all newly hatched iguanas are normally distributed. Step 1 of 2 : Calculate the margin of error for a 98% confidence interval. Round your answer to two decimal places.
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A statistician selected sample of 16 accounts reviewable and determined the mean of the sample to be $5,000 with a standard deviation of $400. She reported that the sample information indicated the mean of the population ranges from $4,739.80 to $5,260.20. She did not report what confidence coefficient she has used. Based on the above information, determine the confidence coefficient that was used.
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