Question: answer this question. A manufacturing engineer is testing a power supply used for machine A. Based on 250 testings, the complete table of observed frequencies

answer this question.

A manufacturing engineer is testing a power supply used for machine A. Based on 250 testings, the complete table of observed frequencies are shown in Table Q4. Test the hypothesis whether the output voltage is adequately describes by a normal distribution with mean of 110 V and standard deviation 10 V at a significance level a= 0.05. Table Q4: Observed frequencies for each class interval of power supply. Class interval Observed frequencies XX130 3 Total 250

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