A math teacher would like to present the midterm results to her class in a way that shows the overall spread of the data. The 25 test scores for the midterm are listed below.
a. Construct a dotplot.
45 78 62 98 50 61 91 89 57 64 77 69 82 73 70 73 79 80 68 72 62 65 78 50 95
b. Explain what the plot tells us.
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Question 2
An airport official wants to prove that the p1 = proportion of delayed flights after a storm for Airline 1 was different from p2 = the proportion of delayed flights for Airline 2 . Random samples from the two airlines after a storm showed that 50 out of 100 of Airline 1's flights were delayed, and 70 out of 200 of Airline 2's flights were delayed. Report your conclusion in terms of the two airlines.
a. The proportion of delayed flights after a storm for Airline 1 seems to be different than the proportion of delayed flights after a storm for Airline 2.
b. The results are not statistically significant: there is not enough evidence to conclude there is a difference between the two proportions.
c. The difference in proportions of delayed flights is at least 15.
d. The proportion of delayed flights after a storm for Airline 1 seems to be the same as the proportion of delayed flights after a storm for Airline 2.
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