1 1.86 Christmas Presents. The Arizona Republic conducted a tele- phone poll of 758 Arizona adults who celebrate Christmas. The ques- tion asked was, "In your family, do you open presents on Christmas Eve or Christmas Day?" Of those surveyed, 394 said they wait until Christmas Day. a. Determine and interpret the sample proportion. b. At the 5% significance level, do the data provide sufficient evi- dence to conclude that a majority (more than 50%) of Arizona families who celebrate Christmas wait until Christmas Day to open their presents? In each of Exercises 12.24-12.33, apply the chi-square goodness-of- fit rest. using either the critical-value approach or the P-value ap- proach, to perform the required Inpothesis fest. 12.24 Population by Region. According to the U.S. Census Bureau . publication Demographic Profiles, a relative frequency distribution of the U.S. resident population by region in 2000 was as follows. Region Northeast Midwest South West ReL. frey. 0.150 0219 0.224 A simple random sample of this year's U.S. residents gave the fol- lowing frequency distribution. Region Northeast Midwest South West Frequency 259 306 367 a. Identify the population and variable under consideration here. h. At the 5% significance level, do the data provide sufficient evi- dence to conclude that this year's resident population distribution by region has changed from the 2000 distribution