Question

food safety guideline is that the mercury in fish should be below 1 part per million​ (ppm). Listed below are the amounts of mercury​ (ppm) found in tuna sushi sampled at different stores in a major city. Construct a 90​% confidence interval estimate of the mean amount of mercury in the population. Does it appear that there is too much mercury in tuna​ sushi?

0.510.51  

0.800.80  

0.100.10  

0.930.93  

1.351.35  

0.560.56  

0.930.93

What is the confidence interval estimate of the population mean

muμ​?

nothing

ppmless than<muμless than<nothing

ppm

​(Round to three decimal places as​ needed.)

Answer 1

Solution

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A В C D F G 2 Mean (x) 0.740 0.51 standard deviation (s) 0.396 4 0.80 Sample size (n) Confidence level (C) Degrees of freedom (df) Critical value (t*) 5 0.10 7 90% 6 0.93 7 1.35 6 1.943 0.56 Lower Limit 0.449 0.93 Upper Limit 1.031 10 0.449 ppm < u < 1.031 ppm 11 12 Yes, because it is possible that the mean is 13 greater than 1 ppm. Also, at least one of the sample values exceeds 1 ppm, so at least some of the fish have too much mercury. 14 15 16 I LL LLI Ln