Cocaine addiction is very hard to break. Even among addicts trying hard to break the addiction, relapse is common. (A relapse is when a person trying to break out of the addiction fails and uses cocaine again.) A study is conducted to investigate the effectiveness of two drugs, desipramine and lithium, in the treatment of cocaine addic
Cocaine addiction is very hard to break. Even among addicts trying hard to break the addiction, relapse is common. (A relapse is when a person trying to break out of the addiction fails and uses cocaine again.) A study is conducted to investigate the effectiveness of two drugs, desipramine and lithium, in the treatment of cocaine addiction. The subjects in the six-week study were cocaine addicts seeking treatment. The 72 subjects were randomly assigned to one of three groups (desipramine, lithium, or a placebo, with 24 subjects in each group) and the study was double-blind.
| Relapse | No relapse | ||
| Desipramine | 10 | 14 | |
| Lithium | 18 | 6 | |
| Placebo | 20 | 4 | |
1.We are interested in knowing whether there was a difference in the proportion of relapse between the two drugs.
- Write the null and alternative hypotheses that would help determine an answer to our research their question. (You are writing equations, not words.)
H0: HA:
- Define the symbol(s) you used in your hypothesis statements above. (You do not have to define H0 and HA):
- What is the symbol for the relevant statistic, and what is its value?
Symbol: __________ Value (a single number): __________
Show clearly how your value is calculated by hand:
- Use StatKey to carry out the hypothesis test.
Record your p-value here: ___________________
♦Paste a snip from Statkey HERE.
- Based on your StatKey results, and using a significance level of .05, state your decision on the hypothesis test. Give:
- Generic Decision that includes an assessment of the strength of your evidence, i.e., correctly referencing a p-value:
- Conclusion in context:
- Which type of error, might have been made, given your decision above (circle one):
Type I Type II
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