Biostatistics question: State a null & alternative hypothesis. Additionally please explain if you’d use a one- or two-sided hypothesis test. Explain your answer. Two areas of the United States --- Marin County, CA and Long Island, NY --- have particularly high incidence of breast cancer. In 2010, a group of investigators set out to determine if socioeconomic status (defined as earning more than $150,000 per year) was associated with breast cancer. In 2010, researchers obtained tax records for the years 2000-2005 from a randomly selected group of women living in Marin County and Long Island. Women whose average annual income during that five year period was greater than $150,000 were classified as HIGH socioeconomic status (SES); those whose average was less than $150,000 were classified as LOW SES.

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Confidence Intervals

When we calculate intervals in probability and statistics, it can be simply termed as finding out a confidence interval. The confidence interval is usually calculated from the data set which is observed. The value of the parameter that needs to be calculated is present here only.