An experiment was conducted on 12 subjects to determine if there is a correlation between caffeine intake
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Question:
An experiment was conducted on 12 subjects to determine if there is a correlation between caffeine intake and performance on statistics tests. The Pearson correlation coefficient was found to be 0.61.
- What are Ho and Ha?
a) | H0: 0, Ha:>0 | |
b) | H0:rho = 0, Ha: rho0 | |
c) | H0:rho 0, Ha: rho=0 | |
d) | H0:0, Ha: >0 |
2. How many degrees of freedom do we have?
3. What is robt?
4. To determine if there is a correlation between these two events, should we use a one-tailed or two-tailed r-test?
5. If we wish to use an alpha of 0.05, the value for rcrit is
6. Using an alphaalpha of 0.05, should we reject the null hypothesis?
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