... Ch 13 4A Picture Says 1,000 Words±Probability sample accuracy (error) can be calculated with a simple formula, and expressed as a ± % number. n 550 - 2000 = 1,4504% - 2% = ±2% Ch 13 13Sample ... 7.3 on a 10-point scale. In addition, we are 99% confident that the true level of satisfaction in our consumer population falls between 6.8 and 7.8 on a 10-point scale”N=77 Ch 13 48Other ... between p% ± e% Ch 13 30•We also know that, given the amount of variability in the population, the sample size will affect the size of the confidence interval. Ch 13 42Estimating s•How...