A COMPANY THAT MAKES COLA DRINKS STATES THAT THE MEAN CAFFEINE CONTENT PER 12 OU

Question

A COMPANY THAT MAKES COLA DRINKS STATES THAT THE MEAN CAFFEINE CONTENT PER 12 OUNCE BOTTLE IS 40 MILLIGRAMS. YOU WANT TO TEST CLAIM. RANDOM SAMPLES OF THIRTY 12 OUNCE BOTTLES HAS A MEAN CAFFEINE CONTENT OF 38.1 MILLIGRAMS WITH STANDARD DEVIATION OF 7.1 MILLIGRAMS. AT a=.08, can you reject the claim?
Find the critical value. A or B and then answer
a. the critical value is ________
b. the cricital values are +-________

Find the standardized test statistic
z=_______

Decide whether to reject or fail the null hypothesis

Explanation / Answer

A. A left-tailed test is also called the lower-tailed test. If alpha is specified as 0.05, then the critical z-value corresponds with P(Z

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