An endocrinologist was interested in exploring the relationship between the level of a steroid (y) and age (x) in healthy subjects whose ages ranged from 8 to 25 years. she collected a sample of 27 healthy subject in this age range. the data is located in the file problem01.txt, where the first column represents x = age and the second column represents y = steroid level. for all r programming, print input and output codes and values, data to be used is below.

(create a quadratic regression in r. write down the fitted equation, multiple r2, and the p-value for β1 from the summary()output.

yi =β0 + β1xi + β2xi2 + εi