What does the phrase 95% confidence mean? The report of a sample survey of 1,014 adults says, With 95% confidence, the true population proportion of all Americans that expect to spend more money on gifts this year than last year is between 0.09 and 0.15.
a) The report is 95% confident that the sample proportion is between 0.09 and 0.15.
b) The report is 95% confident that the true population proportion is between 0.09 and 0.15.
c) The report is 95% confident that all Americans expect to spend between 0.09 and 0.15 on gifts this year.
d) The report is 95% confident that the sample size is between 0.09 and 0.15.