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researchers investigated whether swimming with dolphins improves clinical depression. The table shows results for a group...

researchers investigated whether swimming with dolphins improves clinical depression. The table shows results for a group that swam with dolphins compared to a control group that swam without dolphins.

Group with Dolphins

Group without Dolphins

x = 10 patients improved

n = 15 patients

x = 3 patients improved

n = 15 patients

at the 1% level of significance, test the claim that the percentage showing improvement with dolphins was significantly greater than that without dolphins.

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