researcher has the hypothesis that hormone X is important in producing sexual behaviour. To investigate this question, 20 males rats were randomly sampled and then randomly assigned to two groups. The animals in Group 1 were injected with hormone X and then were placed in individual housing with sexually receptive females. The animals in Group 2 were given similar treatment except they were injected with a placebo solution. The number of matings was counted over a 20-minutes period. For Group 1, the sample mean was 8.4 and the sample variance is 4.2667. For Group 2, the sample mean was 5.6 and the sample variance was 2.9333. Suppose the researcher conducted
A researcher has the hypothesis that hormone X is important in producing sexual behaviour. To investigate this question, 20 males rats were randomly sampled and then randomly assigned to two groups. The animals in Group 1 were injected with hormone X and then were placed in individual housing with sexually receptive females. The animals in Group 2 were given similar treatment except they were injected with a placebo solution. The number of matings was counted over a 20-minutes period. For Group 1, the sample mean was 8.4 and the sample variance is 4.2667. For Group 2, the sample mean was 5.6 and the sample variance was 2.9333. Suppose the researcher conducted an independent-samples tt-test. Which of the following is the obtained tt-statistic?
4.67
4.56
3.30
5.17
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