L24 Quiz_ Group Meeting_ Biostatistics

Question 1 1 / 1 pts I met with my group and completed this Group Quiz with them. Correct! True Question 2 1 / 1 pts Which of the following variables is/are quantitative? (Mark all that apply.) The telephone number of a randomly selected business in town. The 3 most common brands of car found in the US. Correct! The number of people in a randomly selected classroom on campus. Question 3 1 / 1 pts Students in an Introductory Statistics class at BYU-Idaho were studying prices of cold cereal at grocery stores in Rexburg. To get a sample of cold cereal prices, they went to Albertson's and rolled a die to decide which box from the left of the top shelf they would start on. They then recorded every 6th cereal after the first, moving from left to right down the shelves, recording the name, size, and price of each cereal in their sample. Is this study an experiment or an observational study, and why? An observational study, because the students had no control over which cereals were selected. Correct! An observational study, because the students had no control over the price of the individual cereals. An experiment, because the students had control over which sampling method they used. An experiment, because the students had control over which cereals would be selected for the study. Question 4 1 / 1 pts For a Math 221 project, one group of students studied the ages of students on the BYU-Idaho campus. They collected data from a random sample of n=100 students. The sample mean was 21.2 and the sample standard deviation was 2.61. An excerpt of their data is given below. The group notices an error in their data. The age of one of the males (ID=3) was entered incorrectly. He is actually 21 years old. When the error is corrected, what will happen to the sample median? The median will increase. The median will decrease. Correct! It is not possible to determine this without the full data set. The median will stay the same. Question 5 1 / 1 pts The time to complete a standardized exam in the BYU-Idaho Testing Center is approximately normal with a mean of 70 minutes and a standard deviation of 10 minutes. Using the 68-95-99.7 rule, approximately what percentage of students will complete the exam in under fifty minutes? Give your answer accurate to one decimal place. (Example: 24.7) Correct! Correct Answers 2.5 (with margin: 0.0) Question 6 1 / 1 pts The scores on the LSAT are approximately normal with mean of 150.7 and standard deviation of 10.2. (Source: .) Queen's School of Business in Kingston, Ontario requires a minimum LSAT score of 157 for admission. Find the 35th percentile of the LSAT scores. Give your answer accurate to one decimal place. Use the applet. (Example: 124.7) Correct! Correct Answers 146.8 (with margin: 0.3) Question 7 1 / 1 pts A team of dermatological researchers were studying skin cancer among 60- 70 year old American men. Suppose you were a part of the research team and take a sample of men from this age group and calculate the mean number of skin cancer spots in the sample. Also suppose that it is known that the distribution of the number of cancer spots is right-skewed. Suppose the sample size for this study was n=2. What would be the shape of the distributi