I don\'t understand how to get the answer for question 8? I\'m not sure if I am

Question

I don't understand how to get the answer for question 8? I'm not sure if I am right or not? 18course ide 119422 18content id- _2959206 18kstepanull Question Completion Status: chine 2 3.0 12.4 12.4 12.1 12.3 12.1 12.5 12.0 12.1 The question of interest is whether these machine1 produces lighter soap bars than that of machine 2. The computed test statistic was found to be 1.61 Draw your conclusion usinga 10% level of significance assuming that the weights for the two machines are approximately norml. @ a. Machine 1 produces lighter soap bars than machine 2. t*There is a difference in the average weight of soap bars produces by the two machines. O C Machine 1 produces heavier soap bars than machine 2. QUESTION8 The data below give the weights in ounces of randomly-selected bars of bath soap produced by two different molding machines Machine 1 achine 2 3.0 12.4 12.4 12.1 12.3 12.1 12.5 12.0 12.1 The question of interest is whether these machine1 produces lighter soap bars than that of machine 2. The computed test statistic was found to be-1.61. Find the P.value for the this test assuming that the weights for the two machines are approximately normal.. a, 0.946 0.108 0.054 QUESTION 9 Does the gas leakage rate from automobile tires depend on the type of gas used to fill them? A sample of automobile tires are filled with nitrogen to a pressure of 1 atmosphere, and the time is measured for the mant is reneatad for thic camnla

Explanation / Answer

you are right ; here as test statistic is given ; we need to find if it is z ot t distribution ; from t distruibution answers are not matching ; that means they have used z distribution

for whcih p value at -1.61 test statistic and left tailed test =0.054

therefore option C is correct

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