Using the formula for sample error, if p=40, then variability=_____. Marketing Research Chapter 10 Using the formula for sample error, if p=40, then variability=_____. a. 60 b. 1,600 c. 2,400 d. 3,600 e. 40 Answer: c. 2,400 Learn More : Share this Share on FacebookTweet on TwitterPlus on Google+