Camp Minnewonka, a summer camp in the Rocky Mountains, has budgeted $85,500 for a new fleet of sailboats. The boat selected is a deluxe model costing $4,500. a. How many boats can be purchased by the camp?b. If, instead, a standard model was chosen costing $3,420, how many boats could be purchased?
Chapter 8 Notes – Surveys and Sampling Poll: What proportion of all registered voters in the state support the Affordable Care Act Would 1000 voters in Iowa or 1000 voters in NY provide a more accurate estimate (answer in lecture) Example: What percent of St. Cloud teenagers have a smart phone Unknowable so estimate it --- from a sample --- how to take the sample Is the estimate accurate What is the Population of interest All teenagers (13 – 19 years old) in St. Cloud What is the Parameter of interest (answer in lecture) What is the Sample (answer in lecture) What is the Statistic of interest (answer in lecture) How to take the sample (some answers in lecture) Suppose we go to the mall and interview teenagers. Why is that a bad idea Suppose we set up a poll on a website that is popular with teenagers Why is that a bad idea Suppose we send letters with stamped return envelopes to 1000 St. Cloud teenagers asking them to fill out a survey. One of the questions is whether they have a smart phone. Why is that potentially a bad idea Do you have better suggestions What is a simple random sample (SRS) Do we have a decent sampling frame Could your sample have a lot more females than males Why is randomization important How do we randomize What is sampling error Is it bad How do we avoid it Sampling variation better term It is the natural variability in results that will be observed from one sample to the next none o