Two machines produce metal parts. The mean of the weight of these parts is of interest. The following data have been collected
Machine 1
N 30
x(dash) = 0.984
σ 3.67
Machine 2
n 35
x (dash) 0.907
σ 3.11
a. Do both machines produce parts with a statistical same mean weight? State your null and alternative hypothesis, and use a 1% level of significance.
b. If we want the confidence interval to have a half width of 0.05, how many pieces should be collected?
Due to insufficieint time , i will not answer question (b) .
please send the separate question , i will answer it .
Thank you
Two machines produce metal parts. The mean of the weight of these parts is of interest. The following data have been collected Machine 1 N 30 x(dash) = 0.984 σ 3.67 Machine 2 n 35 x (dash) 0.907 σ 3.1...