statistics

profileTylr00

 

Total number of problems correct out of a possible 20

Attitude towards test taking (out of  a possible 100)

17

94

13

73

12

59

15

80

16

93

14

85

16

66

16

79

18

77

19

91

 

Use the table above to answer the following questions

 

  1. Compute the Pearson product moment correlation coefficient by hand and show all work.

  2. Construct  scatter plot for these 10 values by hand.  Based on the scatter plot, would you predict the correlation to be direct or indirect? Why?

 

2.

 

speed (to complete a 50 yard swim)

Strength (number of pounds bench pressed)

21.6

135

23.4

213

26.5

243

25.5

167

20.8

120

19.5

134

20.9

209

18.7

176

29.8

156

28.7

177

 

  1. Using either a calculator or a computer, compute the Pearson correlation coefficient.

  2. Interpret these data using general range, a very weak to very strong and also compute the coefficient of determination.  How does the subjective analysis compare to the value of r2?

    Chapter 6

     

 

  1. Go to the library and find five journals articles in your area of interest (healthcare) in which reliability and validity data are reported and discuss the outcome measures that are used.  Identify the type of reliability that was established and the type of validity and comment on whether you think that the levels are acceptable.  If not, how can they be improved?

  2. Provide an example of when you would want to establish test-retest and parallel forms reliability.

  3. How can test be reliable and not valid and not valid unless it is reliable?

  4. In general terms, describe what a test would be like if it were reliable but not valid.  Now, do the same for a test that is valid, but not reliable.

  5. When testing any experimental hypothesis, why is it important that the test you use to measure the outcome be both reliable and valid?

  6. Describe the differences between content, criterions and construct validity.  Give examples of how each of these is measured.

    please include references

 

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