Question

A 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 98% confidence interval estimate
of the mean amount of mercury in the population. Does it appear that there is too much mercury in tuna sushi?

0.54 0.80 0.10 0.88 1.33 0.58 0.90

What is the confidence interval estimate of the population mean μ?
---------ppm< μ <------- ppm
(Round to three decimal places as needed.)
Does it appear that there is too much mercury in tuna sushi?
A. No, because it is not possible that the mean is greater than 1 ppm. Also, at least one of the
sample values is less than 1 ppm, so at least some of the fish are safe.
B. Yes, because it is possible that the mean is 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.
C. No, because it is possible that the mean is not greater than 1 ppm. Also, at least one of the
sample values is less than 1 ppm, so at least some of the fish are safe.
D. Yes, because it is possible that the mean is not 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.

Answer 1

The calculation is shown below:

SNO	Amount of Mercury
1	0.54
2	0.8
3	0.1
4	0.88
5	1.33
6	0.58
7	0.9
Total	5.13
Mean	0.732857143
Standard Deviation	0.381169878

Yes, because it is possible that the mean is 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.

Hence option B is the correct answer