Let's consider a limited set of climate data, examining temperature differences in 1948 vs 2018.
we sampled 197 locations from the national oceanic and atmospheric administration's (noaa) historical data, where the data was available for both years of interest.

we want to know: were there more days with temperatures exceeding 90'f in 2018 or in 1948?

the difference in number of days exceeding 90'f (number of days in 2018 - number of days in 1948) was calculated for each of the 197 locations.
the average of these differences was 2.9 days with a standard deviation of 17.2 days.

we are interested in determining whether these data provide strong evidence that there were more days in 2018 that exceeded 90°f from noaa's weather stations.

(a) is there a relationship between the observations collected in 1948 and 2018? or are the observations in the two groups independent? explain.

(b) write hypotheses for this research in symbols and in words.

(c) check the conditions required to complete this test. a histogram of the differences is given to the right.

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explanation

the graph has a slope of 1/3 because each time you move up 1, you go to the right 3. so, slope = rise/run = 1/3. we can cross choice a off the list since we want a slope of 3, rather than 1/3.

the first table shown has a slope of -3. this is because the rise is -6 and the run is 2, so slope = rise/run = -6/2 = -3. note how x increases by 2 each time (run) and y drops by 6 each time (rise). choice b can be eliminated.

the second table has a slope of 3. each time x goes up by 1, the y values increase by 3. slope = rise/run = 3/1 = 3. alternatively you can use the slope formula to prove that the slope is 3 here. use any two rows of values to generate the two points. choice c is one of the answers

the third table also has a slope of 3. let's use the slope formula to prove as such. i'm going to use the first two rows of the table. so i'll use the two points (2,1) and (5,10)

m = slope

m = (y2-y1)/(x2-x1)

m = (10-1)/(5-2)

m = 9/3

m = 3 so we get a slope of 3

choice d is the other answer

over the argument its not good to fight.

step-by-step explanation:

what are the statements? and what do you mean by "216 2 1 6"?