Plotting Confidence Band on plotted regression line.

Hi guys, I have stacked on my homework question step ; Step is d)On a new figure, plot scatter diagram fitted curve. Compute and plot 95% confidence band in blue color. Compute and plot 99.9% confidence band in red color. I am trying to add 95% (Blue) and 99.9%(Red) Confidence Bands to my plot which have regression line. Can anyone help me ? My data set consist of 20 y value that corresponds their x values and I generate regression line which refers these values.

I need your help immeadiately :/

Answer 1

[Jonas]

you should be able to solve your problem using polyfit and polyval function, this example of the polyval function should be pretty everything you may want to know