W What is the most important quality of a simple random sample (SRS)? 2 Beaver Stadium is where the Penn State Football team plays. Seats in the purple sections are most expensive, the red sections are the second most expensive, and the orange sections are the cheapest. Penn State at Beaver Stadium LJU SEATS The athletic department wants to conduct a survey about parking at the stadium during the game on November 13th. a. Describe how a systematic random sample of attendees to this game could be conducted. urtod What -M M W 4 5 For each scenario below, first, identify the type of bias present. Then, determine if it will likely cause the percentage of students who think there is too much work assigned in a quarter to be overestimated or underestimated. Last, address how the survey method could be altered to reduce the bias. a. Principal Frank calls a random selection of students on the phone and asks them if the school assigns too much work. b. An email from DONOTREPLY@21cccs.org goes out to all student email addresses with a survey about if the school assigns too much work. c. A random sample of students with a 3.5 GPA or higher is sent a survey about if the school assigns too much work. d. An optional survey is placed at the bottom of every class at the end of the quarter to see if students think too much work was assigned this quarter. e. A random sample of students logged into the Middle School VO during the day on Wednesday is sent a + survey to see if they think too much work was assigned this quarter.goformative.com Module... C a O U + 0 M M W G 3 Alicia is interested in seeing if her new shampoo eliminates dandruff better than Head and Shoulders does. 5 She takes a group of volunteers and splits them into men and women since she thinks the two groups may have different results. Then, she randomly selects half of the men and half of the women to be in the experimental group. The other volunteers are in the control group. All of the shampoo bottles are labeled A or B so Alicia and the volunteers don't know which shampoo is in which bottle. The volunteers take a shower at the test facility and are not able to use conditioner or any other hair products besides the shampoo. After the volunteers use the shampoo, Alicia tests their dandruff levels. She then starts collecting more volunteers for another round of testing in the spring. a. What key information is Alicia missing to be able to determine how effective her shampoo is? b. Describe how each of the following are used in the experiment: randomization, replication, blinding, blocking, confounding. + c. How could Alicia use the same subjects and make this a matched pairs design?M W SIVES The athletic department wants to conduct a survey about parking at the stadium during the game on November 13th. a. Describe how a systematic random sample of attendees to this game could be conducted. b. Describe how a simple random sample of attendees to this game could be conducted. What are the pros and cons of using an SRS to find the opinions about parking of the attendees to this game? c. Describe how a stratified random sample of attendees to this game could be conducted. What are the pr and cons of using a stratified sample compared to a SRS? d. Describe how a cluster sample of attendees to the this game could be conducted. What are the pros an cons of using a cluster sample compared to a stratified random sample?5 A kidney study is looking at how successful two different drug treatments (A and B) are on breaking up small W and large kidney stones. Here is the success rate that was found: Small Stones, Treatment A: 93%, 81 out of 87 trials successful Small Stones, Treatment B: 87%, 234 out of 270 trials successful Large Stones, Treatment A: 73%, 192 out of 263 trials successful Large Stones, Treatment B: 69%, 55 out of 80 trials successful a. Find the success rate of each treatment. Which is more successful overall? b. Compare the success rate of each treatment after separating by size of kidney stone. What can be said about the two treatments now? c. Which is the better treatment, A or B? Explain your reasoning. What is this an example of? +