Testing Claims about Proportions. In Exercises 932, test the given claim. Identifythe null hypothesis, alternative hypothesis, test statistic, P-value or critical value(s), conclusionabout the null hypothesis, and final conclusion that addresses the original claim. Usethe P-value method unless your instructor specifies otherwise. Use the normal distributionas an approximation to the binomial distribution (as described in Part 1 of this section) Gender Selection The Genetics & IVF Institute conducted a clinical trial of theYSORT method designed to increase the probability of conceiving a boy. As of this writing,291 babies were born to parents using the YSORT method, and 239 of them were boys. Usea 0.01 significance level to test the claim that the YSORT method is effective in increasing thelikelihood that a baby will be a boy

Section 4: Statistics in Surveys and Polls Stat 2220, Espey ➢ Survey: an important kind of observational study, a sample is gathered from the population ○ Polls: a type of survey that is usually by phone or mail ○ Face to face surveys: ■ Expensive to pay for surveyors and their travel ■ Variable: are the surveyors consistent (how they ask the question and their tone) ■ Less people may answer or people may lie about sensitive topics in person ○ Mail Surveys: ■ Good for complicated issues because people have time to read, think, and respond ■ Low response/participation rate ■ Expensive (printing and postage) ○ Te