Question: 9.7 Given below are the sodium contents (in mg) for seven brands of hot dogs rated as very good by Consumer Reports (www.consumerreports.org): 420

9.7 ● Given below are the sodium contents (in mg) for seven brands of hot dogs rated as “very good” by Consumer Reports (www.consumerreports.org):

420 470 350 360 270 550 530

a. Use the given data to produce a point estimate of m, the true mean sodium content for hot dogs.

b. Use the given data to produce a point estimate of s2, the variance of sodium content for hot dogs.

c. Use the given data to produce an estimate of s, the standard deviation of sodium content. Is the statistic you used to produce your estimate unbiased?

(Hint: See the discussion following Example 9.3.)

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