Top of Form Question 1 12 Points is the average? 3 4 5 8 2 4 5 10 Bottom of Form Top of Form Question 2 12 Points is the
Top of Form Question 1 12 Points is the average? 3 4 5 8 2 4 5 10 Bottom of Form Top of Form Question 2 12 Points is the median of these figure skating ratings? 6.0 6.0 7.0 7.0 7.0 8.0 9.0 6.0 7.0 7.1 8.0 Bottom of Form Top of Form Question 3 11 Points Two owners of a cattle ranch, Jo and Val, want to find the average weight for the ranch’s 200 cows. Instead of weighing all of the cows: Jo weighs 25 cows and gets an average weight of 1,350 pounds (stdev 50) Val weighs 100 cows and gets an average weight of 1,420 pounds (stdev 50) is Jo’s margin of error, rounded to the nearest whole number? (The formula is ) 10 20 50 529 Bottom of Form Top of Form Question 4 11 Points A media personality argues that global temperatures are not rising, because every year an increase is reported such as 0.08 degrees C. The difference from the previous year is less than the margin of error of about 0.15 degrees C, so that difference should be ignored. is a strong counterargument? Even 0.08 degrees is a lot and thus should be considered. The margin of error is just extra information and thus can be ignored. The difference with any previous decade is much greater than the margin of error. 0.15 – 0.08 is 0.07, which is still an increase and thus should be considered. Bottom of Form Top of Form Question 5 11 Points An article reports that blue eyed people earn less than brown eyed people, with these numbers: average blue-eyed salary $35,000, average brown-eyed salary $37,000, p-value 0.45. Based on that reported p-value, and using the common definition of “statistical significance,” which is the case? The results are nowhere near to being statistically significant. The results are almost but not quite statistically significant. The results are just barely statistically significant. The results are strongly statistically significant. Bottom of Form Top of Form Question 6 11 Points A group of 10 people is choosing a chairperson and vice-chairperson. They put all 10 people’s names into a hat. The first name drawn becomes chair. The second name drawn becomes vice-chair. How many possible combinations of chair and vice-chair are there? 19 90 100 10! (10 factorial) Bottom of Form Top of Form Question 7 11 Points A lock consists of 3 dials, where each dial has 4 letters. is the probability of guessing the right combination in one try? 1/7 1/12 1/24 1/64 Bottom of Form Top of Form Question 8 11 Points About 8% of the U.S. population catches the flu each season. Assuming everyone has equal probability of catching the flu, about what are the odds of catching the flu in a given season? 1 in 8 1 in 12 1 in 18 1 in 80 Bottom of Form Top of Form Question 9 11 Points Kay has an 80% probability of making a free-throw in basketball, and each free-throw is independent. Kay gets to take 2 free-throws, and must make both to win the game. is the probability that Kay’s team will win the game? 64% 80% 88% 160% (so 100%) Bottom of Form Top of Form Question 10 11 Points A company gives each worker a cash bonus every Friday, randomly giving a worker an amount with these probabilities: $10 0.9, $50 0.1. Over many weeks, what is a worker’s expected weekly bonus? (10 + 50) / 2 = $30 10×0.9 + 50×0.1 = $14 (10×0.9 + 50×0.1) / 2 = $7 (10 + 50) / 10 = $6 Bottom of Form Top of Form Question 11 11 Points Estimate the average by first rounding to the nearest 1,000: 1,000 2,300 2,600 2000 3000 4200 6000 Bottom of Form Top of Form Question 12 11 Points Both sets of values have an average of 13. Is Set A’s standard deviation smaller, larger, or about the same as Set B’s? (Note: This question can be answered by knowing the concept of standard deviation, without actually computing the standard deviation). Set A: 1 2 3 23 24 25 Set B: 8 10 12 14 16 18 Smaller Larger About the same Unable to tell Bottom of Form Top of Form Question 13 11 Points If a study determines the difference in average salary for subpopulations of people with blue eyes and people with brown eyes is NOT significant, then the populations of blue-eyed people and brown-eyed people are ________ different salaries. unlikely to have very likely to have guaranteed to have guaranteed to not have Bottom of Form Top of Form Question 14 11 Points How many values are in the range 35 to 95? 62 61 60 59 Bottom of Form Top of Form Question 15 11 Points A restaurant will select 1 card from a bowl to win a free lunch. Jo puts 5 cards in the bowl. The bowl has 100 cards. are the odds of Jo winning a free lunch? 1/5 1/10 1/20 1/500 Bottom of Form Top of Form Question 16 11 Points A medication states that the odds of having an allergic reaction are 1 in 50. is that probability states as a percent? 1% 2% 4% 5% Bottom of Form Top of Form Question 17 11 Points A slot machine has 3 dials. Each dial has 30 positions, one of which is “Jackpot”. To win the jackpot, all three dials must be in the “Jackpot” position. Assuming each play spins the dials and stops each independently and randomly, what are the odds of one play winning the jackpot? 1/30 = 0.03 or 3% 3/(30+30+30) = 3/90 = 0.33 or 33% 3/(30×30×30) = 3/27000 = 0.0001 or 0.01% 1/(30×30×30) = 1/27000 = 0.00003 or 0.003% Bottom of Form Top of Form Question 18 11 Points In any given year, a factory has a 20% probability of having an accident. About every how many years might the factory expect to have an accident? Every 1 year Every 2 years Every 5 years Every 20 years Bottom of Form
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