Carpetland carpet installers earn an average profit of $300 for each carpet installed. Joan Chin, the firm's vice president, proposes a new procedure for installations, which she hopes will be more efficient. Joan hopes that the results of a trial period will enable her to conclude with a level of significance of 0.05 that the new procedure increases the average profit for installing a carpet. 5. Which of the following describes the null hypothesis that Joan will use?