... satisfaction is 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 ... (error) can be calculated with a simple formula, and expressed as a ± % number. n 550 - 2000 = 1,4504% - 2% = ±2% Ch 13 13Sample Size Axiom•The size of the probability sample depends on ... 1,000–Finding: 40% of respondents like our brand–Sample accuracy is ± 3% (via our formula)–So 37% - 43% like our brand Ch 13 17The Confidence Interval Method of Determining Sample Size•Confidence...