ACTIVITY PROPER: Exercise 1: Compute for the test-statistic value and then make appropriate conclusion. 1. The average income of a customer service representative is P 22,000. A survey was conducted among 25 customer service representatives in the city and the mean is 25,000 and the standard deviation is P 5,000. Is there a significant difference between the population mean and sample mean at 5% significance level? 2. According to a guidance counselor, an average student spent less than 5 hours each day for school works. A sample of 100 students in a certain school reveals that the mean hours spent of the students is 6.5 hours with a standard deviation of 0.8. Determine whether the claim of the guidance counselor is correct against the population mean of 7 hours with 90% confidence level