Listed below are the amounts of mercury (in parts per million, or ppm) found in

Question

Listed below are the amounts of mercury (in parts per million, or ppm) found in tuna sushi sampled at different stores. The sample mean is 0.934 ppm and the sample standard deviation is 0.247 ppm. Use technology to construct a 90% confidence interval estimate of the mean amount of mercury in the population.

0.66    0.93    1.12    0.86   0.71   1.38   0.88

what is the confidence interval estimate of the mean amount of mercury in the population

ppm < mean < ppm

round to three decimal places ... two answers

Explanation / Answer

t table value for 90% at 6 df is 1.943

So E=t*sd/sqrt(n)=0.181

Hence CI=mean+/-E=0.934+/-0.181=(0.753,1.115)

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