According to the World Health Organization data the life exp…

According to the World Health Organization data the life expectancy for men in the first world countries have an average life expectancy of 78.4 years, while the average life expectancy of the men in the second world countries is 65.7 years. The absolute difference in life expectancy is = 12.7years.

A medical researcher wanted to know whether at a particular…

A medical researcher wanted to know whether at a particular hospital male or female patients ask more questions about their potency. Of the 400 patients, she interviewed 50 randomly selected male patients and 50 randomly selected female patients. This is an example of stratified sampling.