My recent classes just took a midterm, and I was curious if their grades on the midterm were in some way related to their grades in the class. (I would kind of hope so).
Here are the grades in the class and their grades on the midterm in a csv file.
1) find the correlation between the two sets of data
2) find the line of best fit, and then graph the data and the line of best fit, making appropriate labels
3) Influential points are ones that wreak havoc on the correlation. they do this by either:
being outliers in both the x and the y axis, thus creating a higher correlation
by being outliers in one of the two and thus lowering the correlation.
Do you think that there are any influential points? If so, try to make a strong case for removing the point/points.
QUESTION TWO. This may be dealt with in the class later.
I like to have my class averages on tests at about 80. Is there evidence that can lend me to say that my class average for the midterm was an 80?
QUESTION THREE: That Cretaceous Air (p. 449). Percent of the air that's nitrogen.
air=c(63.4, 65.0, 64.4, 63.3, 54.8, 64.5, 60.8, 49.1, 51)
a) 90% CI?
b) current Nitrogen Levels 78.09% according to wikipedia. with alpha 0.05, was the air "different" then?
QUESTION FOUR. ...monkeys? response stronger to call than tone?
tone=c(474, 256, 241, 226, 185, 174, 176, 168, 161, 150, 145, 141, 129, 113, 112, 102, 100, 74, 72, 71, 68, 59, 57, 56, 47, 46, 41, 35, 31, 28, 26, 26, 21, 20, 20, 19,18)
call=c(500, 138, 485, 338, 194, 159, 341, 85, 303, 208, 42, 241, 194, 123, 182, 141, 118, 62, 112, 134, 65, 182, 97, 318, 201, 279, 62, 84, 103, 70, 192, 203, 135, 129, 193, 54, 66)