5, find a 90% confidence interval for the population mean.

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The times it takes to manufacture an electronic component for a car are normally distributed with a population standard
deviation of 1.3 hours and an unknown population mean. If a random sample of 55 electronic components is taken and
results in a sample mean of 8.1 hours, find a 90% confidence interval for the population mean.
Use the tool below to calculate your confidence interval. Choose the correct confidence level, sample mean, population
standard deviation, and sample size. Then view the confidence interval indicated on the x-axis to find your answer. Please
note, you'll need to use the sliders above the graph to change the x-axis markers. Round your answers to 2 decimal places.
x = 0
Confidence level: 50 %
o = 1.4
0.5
0.9
0.95
0.99
Critical value: 0.674
n = 48
50%
-0.2!
0.2!
-0.13619693
x = 0
0.13619693
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Transcribed Image Text:The times it takes to manufacture an electronic component for a car are normally distributed with a population standard deviation of 1.3 hours and an unknown population mean. If a random sample of 55 electronic components is taken and results in a sample mean of 8.1 hours, find a 90% confidence interval for the population mean. Use the tool below to calculate your confidence interval. Choose the correct confidence level, sample mean, population standard deviation, and sample size. Then view the confidence interval indicated on the x-axis to find your answer. Please note, you'll need to use the sliders above the graph to change the x-axis markers. Round your answers to 2 decimal places. x = 0 Confidence level: 50 % o = 1.4 0.5 0.9 0.95 0.99 Critical value: 0.674 n = 48 50% -0.2! 0.2! -0.13619693 x = 0 0.13619693 МacBook Pro Q Search or enter website name @ # $ % & ( 2 3 4 7 W E R T Y U { P S F G H J K Z V B N M. > .. .. V * CO
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