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KPED 4320

  • Independent variable
  • Catagorical (nominal or ordinal)
  • Numerical (interval or ratio)

  • Dependent variable
  • Catagorical (nominal or ordinal)
  • Numerical (interval or ratio)

Chart4

Females
Males
Height (in)
Comparison of Mean Height
64
69.5555555556

Sheet1

Sex Female=1 Male=2 Height (in) Weight (lbs)
1 65 115 0.4693726192 Females 64 3.5118845843
1 62 105 Males 69.5555555556 3.3116944698
1 56 140
1 65 127
1 68 130
1 67 127
1 62 125
1 63 129
1 64 120
1 68 130
1 64 120
1 56 123
1 65 135
1 66 125
1 63 130
1 67 130
1 67 135
1 61 115
1 67 141
2 69 165
2 72 175
2 67 140
2 68 170
2 71 200
2 70 180
2 72 230
2 73 180
2 70 172
2 60 245
2 75 165
2 70 225
2 72 160
2 69 155
2 66 155
2 68 180
2 72 180
2 68 172

Sheet1
Height (in)
Weight (lbs)
Class Height Weight Regression

Sheet2
Height (in)
Weight (lbs)
Females Height Weight Regression

Sheet3
Height(in)
Weight(lbs)
Mens Height Weight Regression
Height (in)
Comparison of Mean Height
3.5118845843 3.5118845843
3.3116944698 3.3116944698
Height (in)
Comparison of Mean Height
Height (in)
Comparison of Mean Height

Chart5

Females
Males
Height (in)
Comparison of Mean Height
64
69.5555555556

Sheet1

Sex Female=1 Male=2 Height (in) Weight (lbs)
1 65 115 0.4693726192 Females 64 3.5118845843
1 62 105 Males 69.5555555556 3.3116944698
1 56 140
1 65 127
1 68 130
1 67 127
1 62 125
1 63 129
1 64 120
1 68 130
1 64 120
1 56 123
1 65 135
1 66 125
1 63 130
1 67 130
1 67 135
1 61 115
1 67 141
2 69 165
2 72 175
2 67 140
2 68 170
2 71 200
2 70 180
2 72 230
2 73 180
2 70 172
2 60 245
2 75 165
2 70 225
2 72 160
2 69 155
2 66 155
2 68 180
2 72 180
2 68 172

Sheet1
Height (in)
Weight (lbs)
Class Height Weight Regression

Sheet2
Height (in)
Weight (lbs)
Females Height Weight Regression

Sheet3
Height(in)
Weight(lbs)
Mens Height Weight Regression
Height (in)
Comparison of Mean Height
3.5118845843 3.5118845843
3.3116944698 3.3116944698
Height (in)
Comparison of Mean Height
Height (in)
Comparison of Mean Height

Chart6

Females 3.5118845843 3.5118845843
Males 3.3116944698 3.3116944698
Height (in)
Comparison of Mean Height
64
69.5555555556

Sheet1

Sex Female=1 Male=2 Height (in) Weight (lbs)
1 65 115 0.4693726192 Females 64 3.5118845843
1 62 105 Males 69.5555555556 3.3116944698
1 56 140
1 65 127
1 68 130
1 67 127
1 62 125
1 63 129
1 64 120
1 68 130
1 64 120
1 56 123
1 65 135
1 66 125
1 63 130
1 67 130
1 67 135
1 61 115
1 67 141
2 69 165
2 72 175
2 67 140
2 68 170
2 71 200
2 70 180
2 72 230
2 73 180
2 70 172
2 60 245
2 75 165
2 70 225
2 72 160
2 69 155
2 66 155
2 68 180
2 72 180
2 68 172

Sheet1
Height (in)
Weight (lbs)
Class Height Weight Regression

Sheet2
Height (in)
Weight (lbs)
Females Height Weight Regression

Sheet3
Height(in)
Weight(lbs)
Mens Height Weight Regression
Height (in)
Comparison of Mean Height
3.5118845843 3.5118845843
3.3116944698 3.3116944698
Height (in)
Comparison of Mean Height
Height (in)
Comparison of Mean Height
  • One group (one sample) t-test: Compares sample mean to a hypothesized population mean
  • Dependent (paired samples) t-test: Compares two sample means from the same group of subjects
  • e.g., test & retest or before and after
  • Independent (Unpaired) samples t-test: Compares sample means of the same variable from different groups
  • e.g., experimental vs. control or group 1 vs. 2

Examples:

  • Independent t-test
  • Flexibility differences between girls and boys

  • Dependent t-test
  • Pre and Post strength measurements after 6 weeks of training on the Total Gym

A t-test is performed to compare the actual difference between the means of two samples with the difference expected if only chance were operating.

  • Test performed on 2 independent samples
  • experimental group
  • treatment group

*

  • If the t-ratio exceeds the critical ratio, the null hypothesis is rejected.
  • Chance is rejected and probable cause is assumed.
  • If the t-ratio does not exceed the critical ratio, the null hypotheses is accepted.
  • The mean difference is insignificant.

Chart1

Females 3.5118845843 3.5118845843
Males 3.3116944698 3.3116944698
Height (in)
Comparison of Mean Height
64
69.5555555556

Sheet1

Sex Female=1 Male=2 Height (in) Weight (lbs)
1 65 115 0.4693726192 Females 64 3.5118845843
1 62 105 Males 69.5555555556 3.3116944698
1 56 140
1 65 127
1 68 130
1 67 127
1 62 125
1 63 129
1 64 120
1 68 130
1 64 120
1 56 123
1 65 135
1 66 125
1 63 130
1 67 130
1 67 135
1 61 115
1 67 141
2 69 165
2 72 175
2 67 140
2 68 170
2 71 200
2 70 180
2 72 230
2 73 180
2 70 172
2 60 245
2 75 165
2 70 225
2 72 160
2 69 155
2 66 155
2 68 180
2 72 180
2 68 172

Sheet1
Height (in)
Weight (lbs)
Class Height Weight Regression

Sheet2

0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Height (in)
Weight (lbs)
Females Height Weight Regression
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0

Sheet3

0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Height(in)
Weight(lbs)
Mens Height Weight Regression
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Height (in)
Comparison of Mean Height
3.5118845843 3.5118845843
3.3116944698 3.3116944698
Height (in)
Comparison of Mean Height
Height (in)
Comparison of Mean Height

t value =

Difference between group means

Variability of groups

image1.wmf

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_1137749255.unknown

  • DV: Interval or ratio
  • DV: Normal distribution
  • IV: Nominal (can only compare two means)
  • Mutually exclusive groups
  • Random selection or assignment

Comparison of Mean Height

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FemalesMales

Height (in)

Comparison of Mean Height

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FemalesMales

Height (in)

Comparison of Mean Height

60

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FemalesMales

Height (in)

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21

Comparison of Mean Height

60

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66

68

70

72

74

FemalesMales

Height (in)

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