Answer the question

A survey is conducted in a class to reveal the average time spent by students on their mobile phones. It is revealed that the population ion standard deviation is known to be 27 minutes. In a sample of 157 students, the mean time recorded was 146 minutes. Using a 0.05 level of significance, can it be concluded that the average time spend by students on their mobile phones is greater than 140? For the above question, your answer should include the following Clearly state the hypothesis Use a normal distribution curve to show rejection and non rejection regions Identify the critical value Compute the statistic Make a conclusion