QUESTION 49 Questions 44 - 51 concern the following idea: Bob runs a phone company called Phantastic Phones. He conducts a survey on a random sample of 500 of his customers, in which he asks questions about their phone use habits, expenditure on phones, and so on. In the survey, customers were asked how many years they had been with the company and the size of their last monthly phone bill. If Bob wants to work out whether customers in their first two years with the company had a different mean phone bill to those who had been with the company for more than two years, which of the following methadologies would be appropriate? O a. Simple Linear Regression O b. x2 test of independence O c. 2 independent samples t-test O d. Paired samples t-test QUESTION 50 Questions 44 - 51 concern the following idea: Bob runs a phone company called Phantastic Phones. He conducts a survey on a random sample of 500 of his customers, in which he asks questions about their phone use habits, expenditure on phones, and so on. Bob's company sells 4 models of phone. In the survey customers were asked which of the 4 models they own and to rate the phone (either good, average, or poor). If Bob wants to work out whether customers gave different levels of the 3 ratings to the different models, which analysis method should he use? O a. +2 test of independence O b. Simple Linear Regression O c. small sample binomial test O d. ANOVA