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Study Resources (Statistics)

It is believed that students gain weight, on average, during their first year of college. A nutritionist tested this claim, randomly selecting 50 university freshmen and measuring their weight gain during the semester. Her hypotheses were H0:=0 and Ha:>0. She used the 5% level of significance and got a P-value.
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It is conjectured that when fields are overgrazed by cattle there will be a substantial reduction in the available grass during the subsequent grazing season due to the Compacrtion of the soil, A horticulturist at the state agricultural experiment station designs a study to evaluate the conjecture Twenty-one plots of.
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It has been extensively demonstrated that adequate night sleep is crucial for cognitive performance. To investigate whether first year University of Fun students are getting adequate sleep the night before a final exam, 81 randomly selected first year University of Fun students were asked to record their number of hours.
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Infection with the human immunodeficiency virus (HIV) is routinely diagnosed by detecting the presence of specific antibodies in the patient's serum. Although the presence of the virus itself can be now be detected, these tests remain expensive and require laboratory techniques that are not routinely available. The diagnosis of HIV.
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