using standard deviation to calculate the significance of the difference between two means:
work out the means of the two sets of data:
city A:6.2
city B:7.3

Question

amistre64 · Answer

average the mean; subtract the average from each one; square the results and add them together.  Then divide by ... well 2 in this case; then sqrt it

amistre64 · Answer

i get .55 as a standard deviation from the mean of 6.75

anonymous · Answer

what do u mean by average the mean ?

amistre64 · Answer

the mean of the means :)

just add the numbers you got and divide by how many there are

amistre64 · Answer

now im assuming you posted all pertinent information to work from

anonymous · Answer

yes

amistre64 · Answer

6.2 + 7.3
-------- = 6.75 as the average of the means
      2

anonymous · Answer

then i subtract from both numbers ?

anonymous · Answer

can anyone give me the final answer i'm lost

amistre64 · Answer

you subtract the mean from the numbers to find out the distance they are away from the average

amistre64 · Answer

since the average is in the middle between them they are both .55 away from the mean

anonymous · Answer

so what is the final answer ?

amistre64 · Answer

i cant really tell what a final answer needs to be since i cant really make out what the question is acttually asking for :)

amistre64 · Answer

the standard deviation with the data given is .55; and the mean is 6.75 ... how that plays into the answer i dont know