Census bureau data shows that the mean household income in the area served by a shopping mall is $72,500 per year. a market research firm questions shoppers at the mall to find out whether the mean household income of mall shoppers is higher than that of the general population.

The null hypothesis states that the population mean is equal to a certain value

H°:U = $72,500

The alternative hypothesis states that the null hypothesis is false (according to the claim):

Ha:U >$72,500

Result:

H°U= $72,500

Ha:U >$72,500

the assumption the narrator makes in this excerpt is that the messages he heards were going to hurt the narrator's mom; the narrator just springs in to action. the narrator doesn't specify in this excerpt why he believes that the messages present a problem that requires protection.