According to social media blog, time spent on Tumblr, a microblogging platform and social networking website, has a mean of 28 minutes per visit and the standard deviation of the time spent on Tumblr per visit is 5 minutes

According to social media blog, time spent on Tumblr, a microblogging platform and social networking website, has a mean of 28 minutes per visit and the standard deviation of the time spent on Tumblr per visit is 5 minutes.

1. How would you determine your sample size “n”?
2. If you select a random sample of 40, what is the probability that your sample will have a mean above 30 minutes?
3. If you select a random sample of 50, what will be the lower limit and upper limit of the interval symmetrically distributed around the population mean that includes 80% of the sample means?

The goal of corporate sustainability is to manage the environmental, economic and social effects of a corporation’s operations so it is profitable over the long-term while acting in a responsible manner to society. A Nielsen survey found that 55% of global respondents are willing to pay extra for products and services from companies that are committed to positive social and environmental impact. Suppose you select a random sample of 100 global responders what is the