More Practice Problem ANSWERS: t-Test

#4

Which students do significantly better in reading (Words per minute):

High Sch     College 
    7                     5 
    4                     3 
    6                     1 
    6                   11 
    3                     8 
    2                     8 
    1                   13 
    6                     9

t = 1.77

Which students do significantly better in reading: No significant difference. The differences between student groups is likely to be due to chance.

#5

Which cars are the safest (accidents):

Foreign      Domestic 
    16             1 
    14             3 
    12             9 
    18           11 
    12             6 
      7             1

t = 3.45

Which cars are the safest (accidents): Domestic cars are significantly safer than foreign cars.

#6

Which dogs are the meanest (bites per minute):

Big             Little 
 1                   6 
 4                   3 
 3                   9 
 8                 11 
 2                 16 
 7                 11 
 5                 22 
 3                   7

t = 2.37

Which dogs are the meanest (bites per minute): Little dogs are significantly meaner.

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    Day 8: Student’s t-Test
    Bit More About t-Test
    Even More About t-Test
    How to Calculate t-Test
    Practice Problems
    More Practice Problems
    Word Problems
        Sim1           Sim2            Sim3
        Sim4           Sim5            Sim6
        Sim7           Sim8            Sim9
    Basic Facts About t-Test
    Vocabulary
    Formulas
    Quiz 8
    Summary