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Question 5 4.5 pts What is the purpose of finding a sample mean or proportion? O There is no purpose becuase you should always find the population mean or proportion. Estimates are not accurate. O The purpose is to show what one part of the population mean or proportion looks like. O The purpose is to estimate the population mean or proportion. O There is no purpose in taking a sample. It will always be inaccurate.Question 9 4.5 pts Which of the following is not important when designing an observational study or experiment in statistics? O Make a design on how the data will be collected. O Formulate a question that can be answered with data that is collected. O Interpret the results to draw a conclusion. O All samples must simple random samples. No other type will work. Question 10 4.5 pts A teacher at NC State is interested in how often students are missing class when she decides to not take attendance. . The first 9 weeks of the course she takes attendance and records students grades. . The second 9 weeks of the course she does not take attendance and records grades. . At the end of the semester she compares the grades between the two 9 weeks. This is an example of: O A sample. O A survey. O An experiment. O An observational study.Question 11 4.5 pts How is biased reduced when conducting an experiment? O Make sure to assign treatments so that all of the results in the experiment will be the same. O A random sample will be chosen. O The researcher will choose who gets which treatment. O The various treatments will be randomly assigned so that the treatments will go to all types of members in the population. Question 12 4.5 pts A study is designed to determine whether or not taking four years of math in high school helps students' acceptance rate at NC State. . At a certain high school 300 students were not permitted to take a fourth year of math and 300 students were required to take a fourth year of math. . In comparing the acceptance rates of the 600 students at NC State it is noted that the average entrance rate for those who took a fourth year of math is higher than those who took three years of math. . Based on this experiment, guidance counselors began recommending a fourth year of math for college bound students. Which of the following is false? O In order to make a better inference for the population instead of taking students from one high school - the researchers could take an SRS from high schools across the state. O A more meaningful study would be to do an observational study on an SRS of students who have already signed up for a third of fourth year of math. O This design is excellent for establishing cause and effect. Both random assignment and random selection is present. O This design could be improved by randomly assigning 300 students to take a fourth math class and randomly assigning 300 students to take a third math class. Therefore cause and effect could be established.Question 14 4.5 pts The following 12 sample proportions were taken from a group of 25 students. The proportion represents the proportion of students who wear glasses to drive or watch T'v': mum What is the mean of all of the proportions that were gathered in the table above? c: [1.565 c: oars g as C) 0.545 Question 15 4.5 pts Sample proportions of size twelve were taken from a group of students. Students were aslted if theyr wore glasses while watching W. The proportion that wore glasses while watching W was recorded. The standard deviation of the data is {11.13. The margin of error can be given bv the formula Margin 03' END? 2 X L \\I'I r where s is the standard deviation and n is the sample size. What is the margin of error for the data collected? Q 0113 C; [1.104 g cue C; [1.555 Question 13 4.5 pts A questionnaire is sent out to a local community on a proposed real estate tax increase. This tax increase would help to counteract the rising educational costs for the local school. The following question was sent out to the community. - The Little Town School District has one of the lowest per student expenditure rates in the state. - This has resulted in high failure rates, low standardized test scores, and students are struggling to get into tests and colleges. Do you support the real estate tax increase in order to help fund the schools? Does the above question lead the reader to answer in one direction or the other?r Why? C: Since the question states do you support the real estate tax increase it gives the reader the opportunity to answer yes or no. It does not lead the reader in one direction or the other. C: Since the question states that there have been high failure rates and asks the reader if they support the data the reader is most likely to answer yes. (3 Since the question states that there have been high failure rates and asks the reader if they support the data the reader is most likely to answer no. C: Since the question is not giyen to a simple random sample of the population the results of the suwey are meaningless. Question 20 4.5 pts When reading an article how will you know if you can make inference to a larger population? O If the article was written by a renowned scientist. O If the the sample was randomly chosen. O When the question presented was not a leading question. O If the article is written as an opinion piece