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anonymous
 one year ago
A lathe machine produces machine parts whose lengths are normally distributed with a standard deviation of 0.20 mm. A sample of 10 parts is found to have a mean of 16.35 mm. Based on this sample, what is the 95% confidence interval for the population mean ?
anonymous
 one year ago
A lathe machine produces machine parts whose lengths are normally distributed with a standard deviation of 0.20 mm. A sample of 10 parts is found to have a mean of 16.35 mm. Based on this sample, what is the 95% confidence interval for the population mean ?

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rational
 one year ago
Best ResponseYou've already chosen the best response.1start by finding the "margin of error"

rational
 one year ago
Best ResponseYou've already chosen the best response.1whats the multipilier(Z*) value for 95% confidence interval ? (look up in ur notes)

rational
 one year ago
Best ResponseYou've already chosen the best response.1there will be a multiplier value, look up ur notes once

rational
 one year ago
Best ResponseYou've already chosen the best response.1For 95% confidence interval, the multiplier value is `1.96` : dw:1432814569497:dw

rational
 one year ago
Best ResponseYou've already chosen the best response.1therefore margin of error is \[1.96*\frac{0.2}{\sqrt{10}} = ?\]

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0I feel like I messed up

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0.0153664 is what I got and that does not seem right to me

rational
 one year ago
Best ResponseYou've already chosen the best response.1work it again use ur calculator

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0calc says .1214314622

rational
 one year ago
Best ResponseYou've already chosen the best response.1looks good, round it to 0.12 maybe

rational
 one year ago
Best ResponseYou've already chosen the best response.1so the margin of error is 0.12

rational
 one year ago
Best ResponseYou've already chosen the best response.1subtract that from mean, what do u get ?

rational
 one year ago
Best ResponseYou've already chosen the best response.1yes thats the lower bound of confidence interval

rational
 one year ago
Best ResponseYou've already chosen the best response.1for upper bound simply add 16.35 + 0.12 = ?

rational
 one year ago
Best ResponseYou've already chosen the best response.1so the confidence interval is \[\large (16.23,~ 16.47)\]
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