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Four research participants take a test of manual dexterity (high scores mean better dexterity) and an anxiety test (high scores mean more anxiety). The scores are as follows.
Person
Dexterity
Anxiety
1
10
2
8
3
4
a) Make a scatter diagram of the scores;
b) Describe in words the general pattern of correlation, if any;
c) Figure the correlation coefficient:
d) Figure whether the correlation is statistically significant (use the .05 significance level, two-tailed);
e) Explain the logic of what you have done, writing as if you are speaking to someone who has never heard of correlation (but who does understand the mean, deviation scores, and hypothesis testing); and
f) Give three logically possible directions of causality, indicating for each direction whether it is a reasonable explanation for the correlation in light of the variables involved (and why).
Determine probability of generating six digits and getting code consisting of 1, 2, 3, ..., 6 if each digit can be repeated?
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Part 1. What is the appropriate distribution for such data? Part 2. Is this lot anomalous?
The student with the 92 found a grading error on her exam and her correct grade was 95. There were no other grading errors. After correcting this student's paper, the five number summary for the midterm exam will be
The correct set of hypotheses to test the effect of the bonus plan, the difference between the t and z distributions
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