A recent survey reported that small businesses spend $22$

hours a week marketing their business. A local chamber of commerce claims that small businesses in their area are not growing because these businesses are spending less than $22$

hours a week on marketing. The chamber conducts a survey of $85$

small businesses within their state and finds that the average amount of time spent on marketing is $20\mathrm{.}4$

hours a week. Assuming that the population standard deviation is $6\mathrm{.}2$

hours, is there sufficient evidence to support the chamber of commerce$$s claim at the $0\mathrm{.}05$

level of significance?

Step $3$ of $3$ : Draw a conclusion and interpret the decision.