2. A swimming school claimed that the average seven-year-old would be able to swim across an Olympic-sized pool in less than 2 minutes (120 seconds) after taking lessons from their instructors. To test this claim, a consumer psychologist arranged for eight randomly selected seven-year-old children to take lessons at the school and recorded how long it took each child to swim across a pool at the end of the lessons. The times (in seconds) were 60, 120, 110, 80, 70, 90, 100, and 130. What conclusion would the psychologist draw following at test for a single sample using 120 seconds as the "known" population mean and the .05 significance level? Use the five steps of hypothesis testing and calculate effect size. Note that I gave you scores instead of Sum of Squares (SS). You will have to calculate this yourself. Step 1: Null and Research Hypothesis Step 2: Create your comparison distribution Participant X (X-M)² 1 60 1225 625 2 120 110. 225 80 -15 225 70 90 100 130 760 3 4 5 6 7 8 SUM X-M +35 25 Step 5: Decision كل оимийти 25 35 Step 3: Determine your Critical Values Step 4: Calculate your t Score 23 25 1223 4200 Step 6: Calculate Effect Size 760 8 S 45 Meas 5:24-49

In a science fair​ project, Emily conducted an experiment in which she tested professional touch therapists to see if they could sense her energy field. She flipped a coin to select either her right hand or her left​ hand, and then she asked the therapists to identify the selected hand by placing their hand just under​ Emily's hand without seeing it and without touching it. Among 350 ​trials, the touch therapists were correct 165 times. Complete parts​ (a) through​ (d).

Some commercial airlines recirculate about half the air in the cabin during flights as a way to improve fuel efficiency. Other airlines make a policy of NOT recirculating the air and instead, have fresh air from the atmosphere constantly being inserted into the cabin with the “old” air being pumped out of the plane. A total of 1100 passengers flying from San Francisco to Denver were used for an experiment. After their flight, they were each given a list of symptoms associated with the common cold. They were asked to report if they experienced cold symptoms within 24 hours of the flight landing. Of the 517 passengers who flew on planes that recirculate the air, 108 reported post-flight cold symptoms. Of the 583 passengers who flew on airlines that do not use recirculation in the cabin, 110 reported symptoms. Suppose now that we want to use the recirculation of air data to explore “Goal #2”, which is to resolve a hypothesis test about . a) If we want to resolve this hypothesis…

A study was developed to evaluate effectiveness of a weight loss diet plan. An ad was placed in two towns to locate study participants who were to follow the diet. In Town A, the clinicians asked each dieter to report how much weight they had lost over the previous 6 weeks while following the diet. In Town B, the clinicians weighed each dieter at the beginning of the study and again after 6 weeks on the diet program. The weight lost was calculated as the difference between the beginning weight and the weight after 6 weeks. At the end of the study, it was determined that Town B had lost significantly less weight than Town A. 1.What is the population of interest in this situation? 2. Identify source(s) of bias in this study.