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The carbon monoxide (CO) level in a manufacturing plant is supposed to be about 50 parts...

The carbon monoxide (CO) level in a manufacturing plant is supposed to be about 50 parts per million (ppm). However there is concern that actual CO levels are higher than the acceptable level.Five CO measurements are taken at various times during the day and reading are given below. 58 63 48 52 68

(a)At 5% level of significance test whether the mean CO level is higher that 60 ppm.

(b)Find a 95% confidence interval for the mean CO level.

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orchestra answered 1 year ago
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