PS295 Study Guide - Quiz Guide: Scatter Plot, Null Hypothesis, Round-Off Error

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Published on 26 Apr 2013
School
Department
Course
1
Name ________________________ ID# ____________
Lecture section ________ Lab Section #_______
PS296 Assignment 5 Due: Monday April 8
Note: If you do not provide your correct Lab Section above, you will lose 1 point. This assignment, like the previous
assignments, is due at the beginning of class time. If you are late to class, or if you hand it in after the start of class, it
will be marked late; if you have previously submitted an assignment late, the TA will still mark this assignment and
provide feedback, but you will receive a grade of zero for this assignment.
For each calculation question (starting with 1e), you must show the formula used, the
substitution of numbers into the formula, and your final answer (rounded off to two
decimal places).
1a) The data given below represent the age (in years) and asking price (in thousands of
dollars, rounded off) for a sample of 12 used Toyota Corollas (silver exterior, automatic
transmission) advertised in AutoTrader magazine on a randomly chosen day.
Calculate the means of X and Y and complete the calculations in the table, including the
column sums on the bottom row.
Age
(X)
Price
(Y)
()XX
()YY
2
()XX
( )( )X X Y Y
X2
Y2
XY
3
19
1
19
1
17
2
16
2
15
4
14
3
14
2
14
4
11
5
10
4
10
5
9
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2
1b) On the graph below complete the scatterplot of the Toyotas’ ages (0-5 years) on the X
axis against their asking price (9-20 $K) on the Y axis.
Draw a rough best-fitting straight line through the plot, making sure it passes through
the point
 
YX ,
.
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