An electrical firm manufactures light bulbs that have a length life with normal distribution, and a standard deviation of σ = 10 hours. A sample of size n = = 100 is obtained, and its sample mean is calculated to be 330 hours. x = Find the 95% confidence interval for the average length life μ. (328.04,331.96) Find the upper 95% bound for the average length life μ. 331.96 notation. ☑ invalid interval Find the lower 95% bound for the average length life μ. 328.04 notation. ☑ invalid interval Give your answer as intervals. Use -∞ and +∞ if needed.

MATLAB: An Introduction with Applications
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An electrical firm manufactures light bulbs that have
a length life with normal distribution, and a standard
deviation of σ = 10 hours. A sample of size n
=
= 100
is obtained, and its sample mean is calculated to be
330 hours.
x =
Find the 95% confidence interval for the average
length life μ.
(328.04,331.96)
Find the upper 95% bound for the average length life
μ.
331.96
notation.
☑ invalid interval
Find the lower 95% bound for the average length life
μ.
328.04
notation.
☑ invalid interval
Give your answer as intervals. Use -∞ and +∞ if
needed.
Transcribed Image Text:An electrical firm manufactures light bulbs that have a length life with normal distribution, and a standard deviation of σ = 10 hours. A sample of size n = = 100 is obtained, and its sample mean is calculated to be 330 hours. x = Find the 95% confidence interval for the average length life μ. (328.04,331.96) Find the upper 95% bound for the average length life μ. 331.96 notation. ☑ invalid interval Find the lower 95% bound for the average length life μ. 328.04 notation. ☑ invalid interval Give your answer as intervals. Use -∞ and +∞ if needed.
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