A market researcher conducted a study to see if different age groups prefer different news sources. He surveyed 80 people in the 25-49 age group and 80 people in the 50+ age group and asked them if they prefer to get their news from TV, online, radio, or printed newspapers. The data are listed in the table below. Conduct a Chi-Square test for Independence with a = .01. News source Group 18-49 Group 50+ IN Online Radio Printed papers 20 40 15 5 30 20 15 15 Total count 50 60 30 20

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Q: 1. Derive the mean and variance of Be(p) using the exponential family of densities.

A: Note: According to Bartleby guidelines expert solve only one question and rest can be reposted.

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A:

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