N=280 50- R=0.963 540 Smartphone PT (s) 30 20 10 10 20 30 40 50 Laboratory PT (s) a) [*1 point] In the figure, "N=280" and "R= 0.963" mean the sample size is 280 and the sample correlation (r) is 0.963. Based on this information, is the population correlation statistically significantly different from 0 at the 0.05 significance level? Briefly explain your answer. b) Approximately what is the y-intercept of the linear regression line? c) [*1 point] Approximately what is the slope of the linear regression line where Smartphone PT is the response (dependent variable) and Laboratory PT is the predictor (independent variable)