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

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

0.58

0.74

0.11

0.94

1.25

0.52

0.82

Answer 1

n= 7, c= 99%

now calculate the sample mean and sample standard deviation

for given data we get,

=  0.70857, s= 0.35835

formula for confidence interval is

0.70857−0.502 < <    0.70857+0.502)

(0.20643 , 1.2107)

Thus we get confidence interval = (0.20643 , 1.2107)

Yes, there is too much mercury in tuna​ sushi.