Question: a) The scatterplot below shows the relationship between variable x and y. What is the (Pearson's) Correlation coefficient? b) What is a Hexbin plot? When

a) The scatterplot below shows the relationship

a) The scatterplot below shows the relationship between variable x and y. What is the (Pearson's) Correlation coefficient? b) What is a Hexbin plot? When is it useful? c) You are asked to determine the correlation between the price of food items in restaurant menus and their customer ratings (using a 1 to 5 star scale, with no star fractions). Which correlation measure (i.e. correlation coefficient) will you use? Why? d) PharmaCan has developed a new vaccine for Covid 19. To determine if the vaccine is effective, it needs to conduct clinical trials. Describe a statistically sound method of conducting clinical trial to ascertain the vaccine's effectiveness

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