Question

How does increasing the pop. standard deviation affect z?
How does increasing the number of scores in a sample affect z?
How does increasing the difference between the sample mean and the original population mean affect z?
Does z Increase or Decrease?

Answer 1

Why not look up (if necessary) and type in the formula for "z-score?" What parameters (variables) affect the z-score?

Answer 2

I meant for the last one

Answer 3

i think it'd be helpful if you were to type out the formula for the z score. Mind doing that?

Answer 4

z=m-u/om

Answer 5

z=m-u/om \[z=\frac{ x-\mu }{ \sigma}\]

Answer 6

How does increasing the pop. standard deviation affect z? Where is that sigma located?

Answer 7

it decreases z

Answer 8

right. if the pop std dev incr, z decr. yes.

Answer 9

and, as the number of scores increase, z decreases?

Answer 10

"How does increasing the number of scores in a sample affect z?" What's your basis for saying that z decreases? Need to share the formula for sample std. dev.; it's different from that for population std. dev.

Answer 11

since it is in the denominator, it will decrease our answer

Answer 12

Decrease our what?

Answer 13

z

Answer 14

Yes, the SAMPLE z would decrease if n were to increase.

Answer 15

and as standard error increases, z increases

Answer 16

or m-u

Answer 17

Yes. Mind asking questions, if you have any more?

Answer 18

is the difference between the sample mean and the population mean m-u or is it the standard error?

Answer 19

Look up "standard error of the mean" on the 'Net, please.
As a general rule, the sample mean and the pop'n mean are the same quantity, but the std. deviations differ.