Listed below are speeds(mi/h) measured from traffic on a busy highway. The simple random sample was obtained at 3:30 pm on a weekday. Use the sample data to construct a 90% confidence interval estimate of the population standard deviation. 61,64,64,55,64,53,60,59,60,70,62,68

Abit confused about what you mean, but i think you might be referring to slope intercept form: y = mx + bin that case b, or the y intercept is already given.(0,-1)find the slope by using the formulay2 - y1/x2 - x1the final slope will be 4/2, equivalent to 2.now your equation should look like thisy = 4/2x -1sorry if this didn’t you out!