1. In a dataset that includes systolic blood pressure (as outcome variable) and household size (as predictor variable), the number of people in the household ranges from 1 to 7.We treat household size as an ordinal categorical variable (using the i. prefix in Stata).What is the interpretation of beta_0 and/or regression coefficients?

a. beta_0 is the average value of household size

b. regression coefficient is the average value of y for the corresponding value of household size

c. average value of y for a given household size is equal to the sum of beta_0 and the regression coefficient corresponding to household size

d. regression coefficient of a given household size is the average value of y for the household size