An analyst would like to determine if the average amount of time spent by users on a social media platform A is longer than another social media platform B. The data collected is summarized in the following table: Sample mean Sample standard deviation Sample size Social Media Platform A 43.6 minutes 1.8 minutes 50 users Social Media Platform B 42.2 minutes 1.6 minutes 45 users Assume that the population standard deviations are equal. (a) Which piece of information is important for the analyst to determine the appropriate statistical test or formula to use for the hypothesis testing procedure? (b) Perform a hypothesis test to determine if the average amount of time spent by users on social media platform A is longer than those on social media platform B. Use a significance level of a = 0.05.