Homework Help: Statistics

Posted by Alisha on Wednesday, July 11, 2012 at 11:40am.

A comparison is made between two bus lines to determine if arrival times of their regular buses from Denver to Durango are off schedule by the same amount of time. For 51 randomly selected runs, bus line A was observed to be off schedule by an average time of 53 minutes, with a standard deviation of 19 minutes. For 60 randomly selected runs, bus line B was observed to be off schedule an average of 62 minutes, with a standard deviation of 15 minutes. Do the data indicate a significant difference in average off schedule times? Use a 5% level of significance.

Statistics - PsyDAG, Thursday, July 12, 2012 at 11:56am
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

funny question - in a circular road there is a fixed point from which two buses ...
Maths - Eight full buses of tourists are on a tour of tourist spots. Each bus ...
Math: Fractions - A group charters 3 identical buses and occupies 4/5 of the ...
Math - The bus stations in Trawlwy and Fenton are 220 miles apart. A bus left ...
Algebra - The bus stations in Trawlwy and Fenton are 220 miles apart. A bus left...
Algebra - The bus stations in Trawlwy and Fenton are 220 miles apart. A bus ...
physics - (a) daredevil is attempting to jump his motorcycle over a line of ...
Math - The Bee's bus passes Jamie's house every 20 minutes, and the Wasp...
earth science please help .... - How would the seperation between the p wave and...
statistics - sample- a recent study reports that older adults who got regular ...

For Further Reading

First Name:
School Subject:
Answer: