09.03 Randomness in Groups Questions 1-10 of 10 | Page 1 of 1 Question 1 (5 points) You want to survey twenty of the 150 ninth graders to get their opinion on the school's new schedule. Which of the following methods ismost likely to lead to a sample that is the most representaive of the 150 ninth graders? O a Choose 20 ninth graders from your first period class. Ob Choose the first 20 ninth graders from an alphabetical list. OC Select 20 students at random from the ninth grade. Od Select 5 students at random from each of ninth, tenth, eleventh, and twelfth grade. Question 2 (5 points) A research group interested in comparing the effect of different types of music on short-term memory gathers 200 voluteers for a study. One group will listen to a hip hop music playlist while trying to memorize a list of 20 words. A second group will listed to a playlist of orchestral music while trying to memorize the list of 20 words. After a break, the number of words recalled correctly by each individual is measured and the results for the two groups are compared. Is this an experimental study or an observational study? Explain your reasoning.Question 3 (5 points) Why is it important to select samples from a population using random selection? Question 4 (5 points) The United States Senate has 2 senators from each of the 50 states. Select all methods that would select a sample of 10 senators at random from the entire senate. a Take the 10 senators from the 5 largest sates. Ob Take the 10 senators who have served in the Senate the longest. O c Place the names of all 100 senators on individual slips of paper placed into a bowl. Thoroughly mix up the slips and then select 10 of them. O d Send letters to all 100 senators. Select the 10 that reply back the quickest. Number the senators from 1 to 100. Use a random number generator to make a list of 10 random integers between 1 and 100 inclusive.Question 5 (5 points) Why is it important to randomly assign people to random groups in an experimental study? Question 6 (5 points) Andre is in the band and he is conducting an experiment to determine if high school students find listening to classical music or listening to the sounds of the ocean more calming. He selects five students at random from the swim team to listen to the sounds of the ocean. What is problematic about the way that Andre selected his groups? BIUQuestion 7 (5 points) Clare is designing an experimental study. She says that it is important to randomly assign people to random groups in an experimental study because this helps reduce the likelihood of grouping subjects into groups that may differ on some characteristic that is related to the response of interest. Do you agree with Clare? Explain your reasoning. Question 8 (5 points) An environmental education club has 318 members. Select all methods that would select a sample of 20 members at random from the entire environmental education club. O a Ask for 20 members to volunteer to take the survey. Ob Place the names of all 318 members on individual slips of paper placed in a bowl. Thoroughly mix up the slips and then select 20 of them. O c Number the members from 1 to 318. Use a random number generator to make a list of 20 random integers between 1 and 318 inclusive. O d Select 10 of the younger members at random and 10 of the older members at random. De Send a survey to all 318 members and record the results of the first 20 responses.Question 9 (5 points) Why is it important to separate experimental groupd by a random process? G Question 10 (5 points) Elena is conducting an experiment to determine if high school students are more relaxed when the lights are off or when music is played during an exam. She selects 10 of her friends to take an exam with the light off and another 10 of her friends to take an exam with music playing. What is problematic about the way that Elena selected groups