The manager of a fleet of automobiles is testing two different brands of radial tires and assigns one tire of each brand at random to the two rear wheels of eight cars and runs the cars until the tires wear out. The data, in kilometers, follow. Perform a hypothesis test at 0.05 level of significance. What is the Null and Alternative Hypthesis? Define the problem. Brand 1: 36,925 45,300 36,240 32,100 37,210 48,360 38,200 33,500 Brand 2: 34,318 42,280 35,500 31,950 38,015 47,800 37,810 33,215

A group of students in experimental lab are wanting to see if the average psychology major at a university has the same level of psychological knowledge as the general population. They assess 31 psychology majors using an overall psychology assessment and calculate a mean score of 20.91 and a standard deviation of 1.63. They know the general population has a mean score on this test of 18.32. The students think that psychology majors will know more about psychology than the general population. Name the: 1) independent variable 2) scaling for independent variable 3) dependant variable 4) scaling for dependent variable Answer the following questions: 5) can random Selection be used, explain 6) can random assignment be used, explain 7) based on what you know what statistical test should the students use to examine their hypothesis? 8) why is that test most appropriate? 9) what are the assumptions of this test? 10) what is the Null and alternative hypothesis? 11) what is/are the…

Please answer B, C & D.

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he level of cretaine phosphokinase (CPK) in blood samples measures the amount of muscle damage for athletes. At Jock State University, the level of CPK was determined for each of 25 football players and 15 soccer players before and after practice. The two groups of athletes are trained independently. The data summary is as follows :   For football players: Data for Football players n=25 Before Practice After Practice Difference (Before-After) Mean 254.73 225.6 29.13 Standard deviation 115.5 132.6 21.00   For soccer players: Data for Soccer players n=15 Before Practice After Practice Difference (Before-After) Mean 177.1 173.8 3.3 Standard deviation 60.7 64.4 6.88   Assume that all the data above are normal  Test the claim that the mean CPK level has DECREASED for soccer players AFTER exercise (compared to the mean BEFORE exercise), using α=0.10.  AFTER practice, do football players have a DIFFERENT mean CPK values compared to soccer players? Test this claim by…

please provide a clear solution and answer within 30 minutes, thank you!

A researcher conducts a study to investigate whether the obesity rate rural communities differ from the obesity rate from the population at large. He gathered a sample of adults from a small community, measured their weight, and compared it to the population average. What statistical test is appropriate for this study and why?

PC Gaming: A computer magazine editor claims that the mean cost of a gaming computer is $1250. A test is made of =:H0μ1250 versus ≠:H1μ1250. The null hypothesis is not rejected. State an appropriate conclusion.

Find a best-fit line for the following 5 data points. Please state the equation of the line, and give the error vector. 2|3 3 3 45

A student writes the following interpretation of the slope: "The slope of 0.0577 represents the change in Infant mortality rate for a one unit increase in the child death rate.". Is this interpretation correct? Justify.