A study conducted by researchers was designed “to determine if application of duct tape is as effective as cryotherapy (liquid nitrogen applied to the wart for 10 seconds every 2 to 3 weeks) in the treatment of common warts.” The researchers randomly divided 51 patients into two groups. The 26 patients in group 1 had their warts treated by applying duct tape to the wart for 6.5 days and then removing the tape for 12 hours, at which point the cycle was repeated for a maximum of 2 months. The 25 patients in group 2 had their warts treated by cryotherapy for a maximum of six treatments.
Answer to relevant QuestionsGallup News Service conducted a survey of 1026 American adults aged 18 years or older, August 31–September, 2, 2009. The respondents were asked, “Of every tax dollar that goes to the federal government in Washington, ...Explain what is meant when we say “data vary.” How does this variability affect the results of statistical analysis? The data used in the inﬂuenza study presented in Example 3 were obtained from a cohort study. What does this mean? Why is a cohort study superior to a case-control study? What is random sampling? Why is it used and how does it compare with convenience sampling? Suppose you are the president of the student government. You wish to conduct a survey to determine the student body’s opinion regarding student services. The administration provides you with a list of the names and phone ...
Post your question