a sample of 50 women is obtained and their heights (in inches) and pulse rates (in beats per min) are measured. the linear correlation coefficient is 0.229 and the equation of the regression line y= 17.9 +0.870x where x represents hight. the mean of the 50 heights is 63.1 in and the mean of the 50 pulse rates is 72.6 beats per min. find the beats predicted pulse rate of a woman who is 74 in tall. use a significance level of x = 0.05