In a random sample of four mobile devices, the mean repair cost was $70.00 and the standard deviation was $14.00. Assume the population is normally distributed and use a t-distribution to find the margin of error and construct a 95% confidence interval for the population mean. Interpret the results. The 95% confidence interval for the population mean u is ( ). (Round to two decimal places as needed.) ra

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In a random sample of four mobile devices, the mean repair cost was $70.00 and the standard deviation was $14.00. Assume the population is normally distributed and
use a t-distribution to find the margin of error and construct a 95% confidence interval for the population mean. Interpret the results.
The 95% confidence interval for the population mean u is
Eesour
(Round to two decimal places as needed.)
uccess
ia Librai
Success
se Options
Plan
Enter your answer in the edit fields and then click Check Answer.
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remaining
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8:50 PM
P Type here to search
99+
21
2/14/2021
40
4+
ort sc
144
Transcribed Image Text:6.2.20-T Question Help In a random sample of four mobile devices, the mean repair cost was $70.00 and the standard deviation was $14.00. Assume the population is normally distributed and use a t-distribution to find the margin of error and construct a 95% confidence interval for the population mean. Interpret the results. The 95% confidence interval for the population mean u is Eesour (Round to two decimal places as needed.) uccess ia Librai Success se Options Plan Enter your answer in the edit fields and then click Check Answer. parts remaining Clear All Check Answer 8:50 PM P Type here to search 99+ 21 2/14/2021 40 4+ ort sc 144
Expert Solution
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Given data,x=70s=14n=4α=0.05df=n-1=3t-critical value at α=0.05 and df=3 is tc=3.182

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