Problem 2: President Donald Trump and former Vice-President Joe Biden are the two major candidates running for President of the US in the 2020 election. Joe Biden has approximately 64% support among urban (city) voters and about 54% support among suburban voters. However, Donald Trump has approximately 68% support among rural voters. According to Pew Research, approximately 31% of the population lives in an urban area (city), 55% live in suburbs, and 14% live in rural areas. (a) Create a tree diagram to represent this situation. (b) What is the probability that we randomly select a voter that lives in an urban area given that they are a Trump supporter?

Q: Hello there, I don't understand the writing for problem 2. Can someone write the solution neatly?

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A: Both fractions have same denominator 9. So, we can subtract the numerators.

Q: (b) 7. 2. 3. 7. 2. 6. 2.

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Q: How to solve problems 13-16 ?

A: 13. (a) 0.4=1.96 (3)n→n=5.790.4→n=14.475→n=209.5256≅210 Thus, a minimum sample of 210 sizes is…

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Contingency Table

A contingency table can be defined as the visual representation of the relationship between two or more categorical variables that can be evaluated and registered. It is a categorical version of the scatterplot, which is used to investigate the linear relationship between two variables. A contingency table is indeed a type of frequency distribution table that displays two variables at the same time.

Binomial Distribution

Binomial is an algebraic expression of the sum or the difference of two terms. Before knowing about binomial distribution, we must know about the binomial theorem.