Smartphones and purchases. A Google research study asked 5013 smartphone users about how they used their phones. In response to a question about purchases, 2657 reported that they purchased an item after using their smartphone to search for information about the item.3 (a) What is the sample size n for this survey? (b) In this setting, describe the population proportion p in a short sentence. (c) What is the count X? Describe the count in a short sentence. (d) Find the sample proportion p.
ST 260 Chapter 5 Note. Part 1 – 2/10/14 Prof. Cali Davis Quick Recall: Quantitative Variables: differences that have meaning to them, such as age, income, height, and weight. Qualitative Variable (OR categorical): putting people or things into classifications. Such as: gender, race, occupation, country, or political affliction. Statistics can be described as “the science of decisionmaking in the face of uncertainty” (An educated guess) So how do we measure uncertainty Using probability: A numerical value or measure of the LIKLIHOOD that a certain outcome or event occurs. P(A)= probability of eventA