More Practice Problem ANSWERS: Regression

Item 6

If there are 7 professors, how many classes will be taught:

Professors         Classes

        1                     3 
        4                     8 
      12                   13 
        8                     2 
        7                     8 
        7                     9

a =   2.82

b =    .67

r =    .61

see = 3.60

If X (professors) is 7, Y (classes) will be = 7.51

Item 7

If there are 150 candles, how many flowers will a wedding have:

Candles       Flowers

    22                 2 
      8                 4 
      6                 9 
      3               11 
    12                 4 
      1                 6 
    16               19

a =   8.24

b =  - .04

How accurate is your prediction? (see) =  6.36

If X is 150 (candles), Y (flowers) will be = 2.27

Item 8

How much will tuition (in thousands) be in 1997:

Year          Tuition

1990             1
1991             3
1992             9
1993           12
1994           16

a =    .40

b =  3.90

[Hint: use the last digit of the year or convert Years to your own integers]

If X (year) is 7, Y (tuition) will be = 27.7

NOW YOU CHOOSE:

• Read A Bit More About Regression
• Read Even More About Regression
• Listen to Lecture 5 (coming soon)
• Practice Problems
• More Practice Problems
• Review Basic Facts About Regression
• Review Day 6 Vocabulary
• Review Day 6 Formulas
• Take Quiz 6
• Summary