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  3. 1a) the proportions of defective parts produced by

1A) The proportions of defective parts produced by two machines were compared, and the following data...

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Statistics

1A) The proportions of defective parts produced by two machineswere compared, and the following data were collected. Determine a90% confidence interval for p1 -p2. (Give your answers correct to threedecimal places.)

Machine 1: n = 151; number of defective parts =11
Machine 2: n = 153; number of defective parts = 8

Lower Limit -

Upper Limit -

1B) Find the value of t for the difference between twomeans based on an assumption of normality and this informationabout two samples. (Use sample 1 - sample 2. Give youranswer correct to two decimal places.)

SampleNumberMeanStd. Dev.
12437.813.3
2234410.3

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