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QUESTION 5 Ten employees were selected at random, and the data on the number of customers per month were recorded before and after the selected employees attending the workshop. The data were collected and analyzed using SPSS. The results as follow. Paired Samples Test Paired Differences 95% Confidence Interval of Std. Std. Error the Difference Mean Deviation Mean Lower Upper df Pair 1 Before - After 2.70000 3.71334 1.17426 04364 5.35636 2.299 9 Assuming the number of customers is normally distributed. a) The manager decided to analyze the data using Paired Samples Test. Give a reason to support his decision to use this statistical analysis. (1 mark) b) Show the value of t-statistic using appropriate formula. (3 marks) c) Can the insurance manager conclude that the workshop has increased the number of customers? Use a=0.10. (4 marks)