In each of the following situations, state an appropriate null hypothesis, H0, and alternative hypothesis, H1. Identify the parameter that you use to state the hypotheses.
a. Census Bureau data show that the mean household income in the area served by a shopping mall is $63,700 per year. A market research firm surveys shoppers at the mall to find out whether the mean household income of mall shoppers is higher than that of the general population.
b. Last year the local fire department took an average of 4.3 minutes to respond to calls. Do this year's data show a different average response time?
c. The mean area of several thousand apartments in a new development is advertised to be 1,300 square feet. A tenant group thinks that the apartments are smaller than advertised. They hire an engineer to measure a sample of apartments to test their suspicion.