Sunday

February 1, 2015

February 1, 2015

Posted by **johnny** on Tuesday, November 27, 2012 at 9:38pm.

estimate the average diameter of these pipes. A random sample of 18 pipes produces an average diameter of

2.56 mm with a standard deviation of 0.05 mm.

The average diameter of the pipes must not differ significantly from 2.52 mm. Is there enough evidence at

the 5% level of significance to conclude that the true average diameter differs from this amount? Conduct an

appropriate hypothesis test using (i) the p-value method, (ii) the rejection point method, and (iii) the confidence

interval method.

- stats -
**RD Statistics**, Wednesday, November 28, 2012 at 1:36amn = 18

xbar = 2.56 s = 0.05

H0 : mu = 2.52 H1: mu not equal 2.52

test stat = t = (xbar-mu)/(s/sqrt(n)) = 3.39

p-value = 0.003 < 0.05 Reject H0

t-critical = 2.11 < 3.39 Reject H0

CI =(xbar-t-critical*s/sqrt(n), xbar+t-critical*s/sqrt(n))

(2.54, 2.58)

**Answer this Question**

**Related Questions**

Stats - The Ledd Pipe Company has received a large shipment of pipes, and a ...

STATISTICS HELP!!!!! - Bender Electronics buys keyboards for its computers from ...

statistics - 2. Bender electronics buys keyboards for its computers from another...

Statistics - Bender Electronics buys keyboards for its computers from another ...

algebra - A pipe manufacturer makes pipes of four different sizes. The diameter ...

algebra - A pipe manufacturer makes pipes of four different sizes. The diameter ...

Advanced Maths - A reservoir is fed by two pipes of different diameter. The ...

Physics - The water flowing through a 1.9 cm (inside diameter) pipe flows out ...

Physics - The 3.0 cm-diameter water line splits into two 1.0cm-diameter pipes. ...

Statistics - A manufacturer has designed a process to produce pipes that are 10 ...