On a multiple-choice quiz of 25 questions, a correct answer is awarded 4 points and an incorrect answer is awarded 0 points. Sup
1 answer:
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Answer: (0.3332, 0.33341)
Step-by-step explanation:
Formula to find the confidence interval for population mean :
, where n= Sample size
= sample mean.
= Critical z-value (two-tailed)
= population standard deviation.
As per given , we have
n= 53
The critical values for 90% confidence interval :
Now , the 90 percent confidence interval for the true mean metal thickness:
Hence, the 90 percent confidence interval for the true mean metal thickness. : (0.3332, 0.3334)