Prof Rea’s Exam Q7 Suppose that the president has a 54% approval rating among voters. (The population is large enough for trials to be considered independent). What is the probability that a randomly selected voter disapproves of the president? What is the probability that all 4 randomly selected voters approve of the president? Round your answer to three decimal places. What is the probability that of 15 randomly selected voters, exactly 4 approve of the president? Use binomial probability.  Round your answer to three decimal places. Show the calculation to earn full credit.

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Exam Question 5 The two given distributions have the same mean. Without doing any calculations, identify which distribution has less variability. Explain why you think this.  a.  b.  

Niclosamide prevents ATP generation in mitochondria. You would expect this drug to be effective against _______________.

Prof Rea’s Exam Q10 The given scatterplot was generated from data for the first two decades of flu reporting.   The LSR line has equation

Prof Rea’s Exam Q2 A researcher conducted a study to determine if an antidepressant reduces the chance of migraines. He randomly assigned 300 patients to take the antidepressant every day and 300 patients to take a placebo every day. After a certain length of time, he reported the number of migraine days in the patients who took the antidepressant every day and in those who did not take the antidepressant every day. What is the most important reason for the researcher to randomly assign patients to one of the two groups? So that equal amounts of antidepressants and placebo would be used during the experiment. So that the results of the study will generalize. So that the groups are similar, or have no real difference, prior to the treatment. So that there are an equal number of people in both groups.

Prof Rea’s Exam Q11 Given below is a clickable scatterplot that shows the number of non-commercial space launches worldwide and the number of Sociology doctorates awarded in the US.    Sample mean  Sample standard deviation Linear correlation coefficient  Worldwide non-commercial space launches (x) 44.846 5.273 0.789 Sociology doctorates awarded (y) 585.769 32.231   Based on the linear correlation coefficient 0.789, what is the strength and direction of this scatterplot? Explain.  Compute and interpret the slope of the line of best fit in context. Round to two decimal places.  Compute and interpret the y-intercept of the line of best fit in context. Round to two decimal places.  Write the equation of the line of best fit. Use the equation to find the residual for the year 1997 when there were 54 launches and 601 degrees awarded. Based on this scatterplot, do you believe that an increase in worldwide non-commercial space launches will cause the number of sociology doctorates awarded to increase? Explain. 

Exam Question 5 Given below is the sampling distribution of sample proportions from samples of California residents who are equipped with adequate earthquake supplies. What is the value of the population proportion? Explain how you know.  What is the value of the standard error? Explain how you know. How will the standard error change if the sample size is increased? Explain.

Prof Rea’s Exam Q5 The following data represent the amount of time (in minutes) a random sample of ten students enrolled in a college algebra course spent on the homework on “transformation of functions”: [30, 26, 25, 68, 68, 140, 61, 56, 45, 5] Determine the average amount of time a student in the course spent doing the homework. Show the calculation by hand and write the units to earn full credit. Compute the five-number summary for the set of data and draw a box plot. List any outliers. If there are any outliers, indicate them on the graph with an asterisk *. Be sure to label the graph sufficiently. Show all calculations by hand to earn full credit.

Prof Rea’s Exam Q5 Given below is a clickable scatterplot generated from data taken from 11 high school students. What does a point on the scatterplot represent?