Solve a hypothesis case.

A retailer is evaluating if its customer service standard needs to be enhanced. Management has determined that if the average satisfaction score of its customers falls below 80 points, corrective actions will be undertaken. To measure the satisfaction score of its customers, a survey was commissioned. The data collected is shown in a table in Appendix 1.Determineif enhancement of customer service standard needs to be carried out by the retailer with a hypothesis test at 2.5% significance level.

3ii(a) Daily revenue of the new 3ii(b) Satisfaction score of customers product ($) (points) 107959 74 99049 69 95460 74 96300 79 103176 82 107524 71 97420 69 101670 89 107883 80 98001 66 103987 82 89200 68 91658 77 89455 86 100905 76 87960 78 96716 77 86437 100728 87122 97899\f3i(a) Time spent at the shopping mall after renovation(minutes) 3i(b) Price that customer is willing to pay ($) 44 18 80 65 23 25 54 20 80 59 27 27 47 28 80 23 80 21 68 22 64 25 56 16 54 25 62 15 41 27 64 64 23 19 54 27 62 20 43 22 47 21 44 25 76 21 47 17 64 28 41 20 80 18 76 20 66 26 41 25 70 24 78 15 60 25 63 22 62 19 51 20 60 18 68 22 80 16 60 24 51 16 60 24 65 21 80 19