How did you use your cell phone? A Pew Internet poll asked cell phone owners about how they used their cell phones. One question asked whether or not during the past 30 days they had used their phone while in a store to call a friend or family member for advice about a purchase they were considering. The poll surveyed 1003 adults living in the United States by telephone. Of these, 462 responded that they had used their cell phone while in a store within the last 30 days to call a friend or family member for advice about a purchase they were considering.7 (a) Identify the sample size and the count. (b) Calculate the sample proportion. (c) Explain the relationship between the population proportion and the sample proportion.

STAT-5615: Statistics in Research I Lecture 5 Sampling Distributions Ott & Longnecker 4.11-4.13 Dr. Christian Lucero Virginia Tech Fall 2016 Quick Review of Sample Variation Suppose a random sample of si=e5 is taken (without replacement) from the following population. 5,8,10,10,25,26,31,31,35,37 The population mean is=m21.8 and population standard deviation = 12.26377. Sample 1: f5, 10, 26, 31, 35g Sample mean:x = 21.4, Sample standard devia=i13.20227. Sample 2: f5, 8, 25, 31, 37g Sample mean: x= 21.2, Sample standard devia=i14.11382. Sample 3: f10, 10, 31, 35, 37g Sample mean:x = 24.6, Sample standard devia=i13.50185. Sampling Distributions We have