Question

a) It is known that for a particular type of ant, each ant can carry μ...

a) It is known that for a particular type of ant, each ant can carry μ = 11.5 times its own weight. A colony of similar ants was discovered, and the ants were sampled (n = 26) and found to be able to carry a mean of 12.9 times their own weight. Are the ants in this colony stronger or weaker than their "cousins"?

-Describe the independent variable or population of interest:

-Describe the dependent variable:

-Write the null hypothesis in words:

-What type of t-test is appropriate here: single-sample or independent-samples:

b) A researcher was interested in the effect of alcohol on ratings of attractiveness. A random sample of students (over the age of 21, of course) participated. Half of the students were given two bottles of Guinness to drink within 30 minutes, and half were given two O'Doul's (non-alcoholic "beer") to drink within 30 minutes. After drinking, the participants rated pictures of people on a scale from 1 to 10, with 10 being the most attractive. For the alcohol group, the mean rating was 8.7, and for the control group it was 5.2. Does alcohol affect the perceived attractiveness of people?

-Describe the independent variable or population of interest:

-Describe the dependent variable:

-Write the null hypothesis in words:

-What type of t-test is appropriate here: single-sample or independent-samples:

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