School

University of AlbertaDepartment

StatisticsCourse Code

STAT141Professor

Peter HooperStudy Guide

QuizThis

**preview**shows half of the first page. to view the full**1 pages of the document.**Quiz 1 questions, MGTSC 312, FALL 2018 to be answered this coming week in class, closed notes and book.

Also, for this quiz, you cannot use Excel tools or functions, or anything on your laptop but arithmetic features.

Getting into Chapter 4

You are given the following sample data:

Trip

km (x)

l (y)

xx

yy

2

)xx(

2

)yy(

col. 1

col. 2

col. 3

col. 4

col. 5

col. 6

1

500

60

2

200

25

3

700

80

4

600

75

1. Give the mean for x.

2. Fill in the values for column 3. What is the sum of the values you filled in for column 3?

3. Fill in the values for column 5.

4. What is the sum of the squared deviation from the mean for the variable x?

5. What is the value for the variance of x?

6. What is the value for the standard deviation of x?

7. Consider a new variable z set equal to the constant 10 plus 2 times x. What is the sum for this new variable

over the values of the index i for 1 through 4? That is, what is the value of the expression

?

8. What is the value of the variance of the variable z you created in problem 6? What is the value of the

standard deviation of the variable z you created in problem 6?

9. What is the value of

?

10. What is the value of the median for the variable x for which you are given values in the table above?

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