Determine whether the results appear to have statistical significance, and also determine whether the results appear to have practical significance. In a study of a birth sex selection method used to increase the likelihood of a baby being born female, 1916 users of the method gave birth to 941 males and 975 females. There is about a 23% chance of getting that many babies born female if the method had no effect. Because there is a 23% chance of getting that many babies born female if the method had no effect, the method couples would likely use a procedure that raises the likelihood of a baby born female from the approximately 50% rate expected by chance to the % produced by this method. (Round to the nearest integer as needed.) So, this method has statistical significance. does not have practical significance. should be used to make conclusions. has practical significance.

A president of the teachers’ union is preparing for upcoming negotiations. He is investigating the salary structure of classroom teachers in a district.  He believes there are three factors that affect a teacher’s salary: years of experience, a teaching effectiveness rating given by the principal, and whether the teacher has a master’s degree (0 = no, 1 = yes). A random sample of 20 teachers resulted in the following data. Salary Years Rating Masters       31.100 8 35 0       33.600 5 43 0       29.300 2 51 1       43.000 15 60 1       38.600 11 73 0       45.000 14 80 1       42.000 9 76 0       36.800 7 54 1       48.600 22 55 1       31.700 3 90 1       25.700 1 30 0       30.600 5 44 0       51.800 23 84 1       46.700 17 76 0       38.400 12 68 1       33.600 14 25 0       41.800 8 90 1       30.700 4 62 0       32.800 2 80 1       42.800 8 72 0 a. Determine the regression equation. What salary would you estimate for a teacher with 11…

The Humane Society of California reported in one of its most recent magazines that 11.6% of American Adults have both a cat and a dog in their household. Suppose that this data is based on a 1,000 randomly selected independent American adults. Which conditions did this study meet? The data is a (choose one: random or non random) sample We know that there are at least (provide a number here) successes and at least  (provide a number here) failures

e-Books A study by the Pew Internet & American LifeProject found that 78% of U.S. residents over 16 yearsold read a book in the past 12 months. They also foundthat 21% had read an e-book using a reader or computer during that period. A newspaper reporting on these find-ings concluded that 99% of U.S. adult residents had reada book in some fashion in the past year. (http://libraries.pewinternet.org/2012/04/04/the-rise-of-e-reading/) Do youagree? Explain.