Baseball fans In a national poll taken in February 2008, Gallup asked 1006 adults whether they were baseball fans; 43% said they were. Two months previously, in December 2007, 40% of a similar-size sample had reported being baseball fans. a) Find the margin of error for the 2008 poll if we want 90% confidence in our estimate of the percent of national adults who are baseball fans. b) Explain what that margin of error means. c) If we wanted to be 99% confident, would the margin of error be larger or smaller? Explain. d) Find that margin of error. e) In general, if all other aspects of the situation remain the same, will smaller margins of error produce greater or less confidence in the interval?
STAT 110: Notes for Week of 10/25/16 Chapter 21 o This section will focus on interpreting data and inferential statistics (making inferences about a population based on data from a population sample). o The sample proportion probably is not equal to the parameter. Sample proportion: p = (# of successes/n) n = number of subjects in the sample o The sample mean is never equal to the population mean. o Since the sample proportion is probably not equal to the parameter, we will take a confidence interval (sample proportion +/- the margin of error) to make a more confident statement about the data. o Sample distribution: the distributio