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The mean potassium content of a popular sports drink is listed as 146 mg in a...

The mean potassium content of a popular sports drink is listed as 146 mg in a 32-oz bottle. Analysis of 28 bottles indicates a sample mean of 145.5 mg.

(a) State the hypotheses for a two-tailed test of the claimed potassium content.
a. H0: μ = 146 mg vs. H1: μ ≠ 146 mg
b. H0: μ ≤ 146 mg vs. H1: μ > 146 mg
c. H0: μ ≥ 146 mg vs. H1: μ < 146 mg
a
b
c
(b)

Assuming a known standard deviation of 1.9 mg, calculate the z test statistic to test the manufacturer’s claim. (Round your answer to 2 decimal places. A negative value should be indicated by a minus sign.)

  Test statistic   
(c)

At the 5 percent level of significance (α = 0.05) does the sample contradict the manufacturer’s claim?

  
Decision Rule: Reject H0 (Click to select)if z > + 1.96 or if z < -1.96if z < + 1.96 or if z < -1.96if z < + 1.96 or if z > -1.96
  
The sample (Click to select)does not contradictcontradicts the manufacturer's claim.
(d)

Find the p-value. (Round intermediate calculations to 2 decimal places. Round your answer to 4 decimal places.)

  p-value   

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