Posted by **amy** on Tuesday, November 29, 2011 at 12:20am.

An engineering company believes it has developed a faster way to complete the assembly of an industrial machine. The present process takes an average of 6.5 hours to complete and the times it takes to complete the process are approximately normally distributed. If the mean time for the new process is faster at the 0.05 level of significance, the engineering company will present the new process to their clients. Otherwise, the company will do further research. The company assembles a number of machines using the new process and randomly selects 17. The assembly times for the 17 machines in the sample are shown. Perform a hypothesis test showing your work.

- statistics -
**PsyDAG**, Tuesday, November 29, 2011 at 10:46am
Z = (mean1 - mean2)/standard error (SE) of difference between means

SEdiff = √(SEmean1^2 + SEmean2^2)

SEm = SD/√n

If only one SD is provided, you can use just that to determine SEdiff.

Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion related to the Z score.

## Answer this Question

## Related Questions

Algebra 1--Please, check my answer! - Connor and Matt walks a 12-mile course as ...

Math - It takes Jaiden 5 and 3/4 hours to do her homework each week. It takes ...

statistics - the average number of years a person takes to complete a graduate ...

maths - would it be number 6? The head of an industrial machine moves in a ...

Radical and Rational exponents - Estimate how long it takes you to complete a ...

math - If a Ferris wheel takes 45 seconds to make a complete rotation, how many ...

MATH - An application of a rational function is T = (AB)/(A+B), which gives the...

math - Suppose that the time (in hours) required to repair a machine is an ...

accounting - Cargin Company uses the FIFO method in its process costing system. ...

maths - 10. A company involved in the assembly and distribution of printers in ...