The lifetime of a certain brand of light bulbs is known to be normally distributed. A sample of 10 bulbs gives a mean lifetime of 124.0 hours with a standard deviation of 6.0 hours. Calculate a 99% confidence interval for the mean lifetime of light bulbs of this brand. We are standardising x¯ with sn√ so we will need to use the t distribution to calculate t* (rather than using the Standard Normal distribution to calculate z*). You can calculate t* using the Theoretical Distributions - t - function in StatKey. You will need to know the 'degrees of freedom'. Degrees of freedom = n - 1. Select one: (117.99, 130.01) (117.83, 130.17) (118.65, 129.35)
The lifetime of a certain brand of light bulbs is known to be normally distributed. A sample of 10 bulbs gives a mean lifetime of 124.0 hours with a standard deviation of 6.0 hours. Calculate a 99% confidence interval for the mean lifetime of light bulbs of this brand. We are standardising x¯ with sn√ so we will need to use the t distribution to calculate t* (rather than using the Standard Normal distribution to calculate z*). You can calculate t* using the Theoretical Distributions - t - function in StatKey. You will need to know the 'degrees of freedom'. Degrees of freedom = n - 1. Select one: (117.99, 130.01) (117.83, 130.17) (118.65, 129.35)
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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The lifetime of a certain brand of light bulbs is known to be normally distributed. A sample of 10 bulbs gives a mean lifetime of 124.0 hours with a standard deviation of 6.0 hours. Calculate a 99% confidence interval for the mean lifetime of light bulbs of this brand.
We are standardising x¯ with sn√ so we will need to use the t distribution to calculate t* (rather than using the Standard Normal distribution to calculate z*). You can calculate t* using the Theoretical Distributions - t -
Select one:
(117.99, 130.01)
(117.83, 130.17)
(118.65, 129.35)
(119.71, 128.29)
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