An internet marketing firm wishes to determine the average time, in minutes, 10-year-olds spend browsing the internet each day under parental guidance. They randomly selects seventy households with 10-year-old children and obtains the following results. A report published recently indicates that the average time spent by 10-year olds browsing the Internet is 43 minutes per day. The internet market firm wants to claim that the average time spent browsing the internet has increased after the report had been published. They assume that the population from which the sample was drawn is normally distributed. State the null hypothesis and the alternative hypothesis.