In a study of three nationally representative large- scale data sets from Ireland, the United States, and the United Kingdom (n = 17,247), teenagers between the ages of 12 to 15 were asked to keep a diary of their screen time and answer questions about how they felt or acted. Identify the explanatory variables. Comment on wheter the results of the study can be generalized to the population and why

only parts D, E, & F

A researcher uses a matched-samples design to investigate whether single people who own pets are generally happier than singles without pets. A mood inventory questionnaire is administered to a group of 20- to 29-year-old non-pet owners and a similar age group of pet owners. The pet owners are matched one to one with the non-pet owners for income, number of close friendships, and general health. The data are as follows: Matched pair Non-pet Owner Pet owner A 10 15 B 9 9 C 11 10 D 11 19 E 5 17 F 9 15 1. Is there a significant difference in the mood scores for non-pet owners versus pet owners? 2.What is the appropriate statistical tool? 3. t-value? 4. p-value? 5. Interpret the results.

You may need to use the appropriate technology to answer this question. Forty-minute workouts of one of the following activities three days a week will lead to a loss of weight. Suppose the following sample data show the number of calories burned during 40-minute workouts for three different activities Swimming Tennis Cycling 403 410 380 375 485 250 420 455 290 405 415 397 427 525 273 Do these data indicate differences in the amount of calories burned for the three activities? Use a 0.05 level of significance. State the null and alternative hypotheses. O H: Median, = Median, = Median. H: Medians + Median, + Median. O Ho: Median, + Median, + Median. H: Median, - Median, = Median. O H,: Not all populations of calories burned are identical. H: All populations of calories burned are identical. O Ho: All populations of calories burned are identical. H: Not all populations of calories burned are identical. O Hg: Mediang = Median, = Medianc H: Median, Median. Find the value of the test…