Asked by Feifer
According to a study several years ago by the Personal Communications Industry Association, the average wireless phone user earns $62,600 per year. Suppose a researcher believes that the average annual earnings of a wireless phone user are now higher and he sets up a study to prove his theory. He randomly samples 48 wireless phone users and finds the average annual salary for this sample is $64,820 with a standard deviation of $7,810. Use to test the researcher’s theory.
Answers
Answered by
PsyDAG
Z = (mean1-mean2)/sqrt(SEm1^2 + SEm2^2)
SEm = SD/sqrt(n-1)
If only one SD is known, it can be used alone.
Look up Z in table in the back of your stats text labeled something like "areas under normal distribution to find proportion.
SEm = SD/sqrt(n-1)
If only one SD is known, it can be used alone.
Look up Z in table in the back of your stats text labeled something like "areas under normal distribution to find proportion.
Answered by
josh
HA idk
Answered by
Anonymous
-1.97
Answered by
aimen
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