Can someone please help me with my AP statistics homework? Thank you! Questions 1-4

4) You would like to Perform an experiment the effectiveness of extra-fluoride toothpaste on Students aged 5- 14 who have early- Stage tooth decay. Assume the extra fluoride toothpaste has already been proven to be safe for Children to use. You select a random sample of 20 Students aged 5-9 and 30 Students aged lo - 15 . Describe a randomized block design block by age group you will use to test the effectiveness of the extra-fluoride toothpaste . Remember to detail the Key elements of your design Concerning control and randomization. List the response Variable you will use to Collect your data as well as at least one possible confoundingon or lurking jariable ,Planning a AP Statistics ( HW) Study O. Explain in your own words how each of the following may add bias or affect the results of a survey or a experiment design. a . Hawthorne Effect b . Placebo Effect c. Interviewer induced Bias 1/ d. Response Bias E. Non - response Bias bill ) (2) Choose 1 of the terms from Question Ic, Id; or le and give a Specific way it may alter results of a survey . Jo 22 3) In The early 1900s a dentist in Colorado was investigating the cause of brown spots found on teeth in patients In his research he observed data that indicated these brown- Stained teeth had increased levels of fluoride and decreased Occurence of tooth decay and Cavaties Is this research sufficient to Conclude that fluoride prevents Cavaties ? Explain why or why not