HW1: Fundamentals of Data: 1) What is wrong with the following statement? (5-pts

Question

HW1: Fundamentals of Data: 1) What is wrong with the following statement? (5-pts) " The data is showing me that X is greater than Y" 2) If I go out and record the blood types of all incoming freshmen at UNR, the data I collect will be ‘Quantitative, or ‘Categorical? (5-pts) 3) I go out and record how fast 100 UNR math majors can run the 100m dash. How many cases do I have and what is my variable? (2-pts) Over what range are the values of my variable likely to be distributed? Note: there is room for humor here.(3-pts) What type of graph would we use to illustrate how the distribution might look (2pts)? What three things need to be on this graph (3-pts)? Sketch an informative graph illustrating how the distribution might look (5 pts) a. b. c. d. e.

Explanation / Answer

Solution1:

What is X and Y not shown

.IS X mean and Y median

or X median or Y mean.

Nothing is mentioned

Are X and Y aggregate measures?

are they sum of 2 data sor one data.

Solution2:

Its categorical variable

blood type

o-

o+

AB+AB-

B+ ,B-

categorical variables place individuals into one of several gropus of catgories.

Solution4:

average or mean=sum of points /total points

=12+23+11+42+51/5

=139/5

mean=27.8

AVerage=27.8

mediian is middlemost item when data arranged in Ascending order

11,12,23,42,52

middle value=23

median=23

std deviation is calculated by

taking the difference of each value from it ,square it,divide by n-1 and take square root

teh table is given below

X XBAR X-XBAR (X-XBAR)^2 12 27.8 -15.8 249.64 23 27.8 -4.8 23.04 11 27.8 -16.8 282.24 42 27.8 14.2 201.64 51 27.8 23.2 538.24 1294.8 SD=SQRT(1294.8/5-1)=17.99166

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