Research is conducted to review the amount of money people spent in a trip. Two separated surveys were conducted. Survey 1: Taiwan trip A sample of 8 people are asked about their spending in a trip to Taiwan. The amounts ('5) are recorded as follows: 8200 8500 4300 5200 5600 7800 2320 10000 Survey II: Korea trip A report consists of 12 people indicated that the sample mean spending in a trip to Korea is $7890 with sample standard deviation is 3317799132. (a) By combining the result of two surveys, find the average spending of these 20 people. (2 marks) (b) Below is the Excel summary report generated at 5% signicance level. Prepare a report in critical value approach to discuss if there is sufcient evidence to conclude that the population mean spending in a trip to Taiwan is lower than that to Korea. (The test report must include (i) null hypothesis and alternative hypothesis, (ii) rejection region(s), (iii) calculated test statistics, and (iv) conclusion.) (8 marks) t-Test: Two-Sample Assuming Equal Variances Taiwan Trip Korea Trip Mean 6490 7890 Variance 65202285714 31680909091 Observations 8 12 Pooled Variance 4471700 Hypothesized Mean Difference 0 (if 18 I Stat 4.4505 P(T