Q1) A study was performed on annual incomes of corporate trainers in state of New York in metropolitan areas having population less than 100,000 and in metropolitan areas having a population over 500,000. Sample statistics are given below:
|
Sample Statistic
|
Population less than 100K
|
Population more than 500K
|
|
Sample Size
|
45
|
60
|
|
Sample Mean
|
$31,290
|
$31,330
|
|
Sample SD
|
$1,060
|
$1,900
|
Test hypothesis that annual incomes of corporate trainers in areas of more than 500,000 are considerably more than those in areas of less than 100,000. Make use of the 5% level of risk.