Sophia Statistics Unit 1 Milestone 1 Exam

An art teacher is trying to determine which class to offer next summer. She passes out a slip of paper to some of the students in the class asking them whether or not they liked her course, and what class they would most like to see offered in the summer. Which type of statistical study is the art teacher conducting? • A single-blind study • A double-blind study • A survey • A census 2 A shoe retailer decides to record the styles and sizes of shoes that his customers choose. He records this data for an entire year by keeping track of his customers’ purchases. Which statement accurately describes the type of data the shoe retailer is collecting? • The shoe retailer is receiving raw data on shoe sizes and styles from nearby shoe companies. • The shoe retailer is receiving available data on shoe sizes and styles from nearby shoe companies. • The shoe retailer is gathering raw data because he is recording shoe sizes and styles by himself. • The shoe retailer is gathering available data because customers tell him which shoe sizes and styles they prefer. 3 To determine what percentage of 376 teachers at a university were female, Ryan randomly selected 14 teachers. He then collected and analyzed his data. Select the statement that is TRUE. • There are 14 teachers in Ryan’s sample, and 376 teachers are in the population. • None of the answer choices are true. • There are 14 teachers in Ryan’s sample, and 362 teachers in the population. • There are 376 teachers in Ryan’s sample, and 14 teachers are in the population. 4 Several scientific and statistical studies have been done to determine whether or not pollutants in soil increase the incidence of cancer. A study based on many previous studies summarizes that there is no link between pollutants in soil and cancer. This kind of statistical study is called a __________. • Matched-pair design • Clinical trial • Prospective study • Retrospective study 5 Aaron has designed a trial to test a new energy drink. Fifty individuals in the treatment group try the new energy drink every day for two weeks, and they describe a moderate increase in their energy levels. Fifty individuals in the control group drink sugar water every day for two weeks, and they describe a significant increase in their energy levels. What has Aaron observed? • The margin of error • The placebo effect • A confounding variable • A sampling error 6 A grocery store owner asked the first 20 children who visited the store one day about their favorite snack. This is what type of sampling? • Convenience sampling • Stratified sampling • Voluntary response sampling • Systematic sampling 7 A survey conducted among students in the school cafeteria asked a set of questions listed below. Which survey question would produce a qualitative response? • How many hours do you spend reading books every day? • How many cups of fruit juice do you drink daily? • What is your favorite dish? • How many servings of fruit do you eat each day? 8 To test the effectiveness of a new, cholesterol-lowering drug, a group of researchers recruits 200 volunteers with high cholesterol to take part in a study. The researchers place the numbers 1 through 200 in a hat and have each participant select a number. Those who picked an odd number receive the new drug, while those who picked an even number receive a placebo. Which experimental design are the researchers using? • Representative Sample Design • Matched-Pair Design • Randomized Block Design • Completely Randomized Design 9 A hunter is practicing his aim using a practice target. He takes 5 shots. All 5 shots hit the target, but they do not hit or surround the bullseye. In addition, all 5 shots are very spread apart on the target. Classify the hunter’s accuracy and precision. • Low accuracy and low precision • High accuracy and high precision • Low accuracy and high precision • High accuracy and low precision 10 A