Small Sample Mean Problem. The maker of Mini-Oats Cereal uses an automated packa

Question

Small Sample Mean Problem. The maker of Mini-Oats Cereal uses an automated packaging machine to pack its 24 ounce box of cereal. At the end of every shift 16 boxes are selected at random and tested to see if the equipment needs to be readjusted. After one shift, a sample of 16 boxes yielded the following data. mean = 24.33 s = .64 n = 16. If we were to conduct a test to see if the sample estimate is different from the company’s expected weight of 24 oz. at an alpha level = .05, what is (are) the critical t-value(s) for this test? A.-1.753 to 1.753 B.-2.131 to 2.131 C.2.131 D.-2.120 to 2.120

Explanation / Answer

degrees of freedom = 16 -1 = 15

its a two tailed test

hence

t-critical value = T(0.05/2 , 15)

= +/-2.131

hence choose B)

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