9. A survey on a sample of persons who played at least one of the video games P, Q and R yielded the following data: 33 persons played P 40 persons played Q 36 persons played R 7 persons played P and R only 4 persons played P and Q only 12 persons played Q and R only 15 persons played Q only. (a) Use x to represent the number of persons who played all three video games. Draw a carefully labelled Venn diagram to represent the data given. (b) Determine the value of x. (c) Calculate the number of persons in the sample.

Q: what is the difference when 3 hours and 47 minutes is subtracted from 6 hours and 10 minutes?

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A:

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Q: 7) A building is 300 feet tall. It casts a 165 foot long shadow. A statue near the building is 40…

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Q: 75% of students who graduated from high school in 2006 took the SAT, and 40% of 2006 high school…

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Q: The lcm of 36, 48 and 80 is ?

A:

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A: We will simply use vector addition rules to find the answer

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Q: If 1 waffle costs 30 hats, the cost of 12 waffles is ______?

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Q: Find the value of a, b, and c if (a+b)(a+b+c)=21, (a+c)(a+b+c)=35, and (b+c)(a+b+c)=42.

A: First we need to make some equations and the we have to simplify them in order to get a, b and c.

Q: Use de Moivre’s theorem with n = 4 to prove that cos(4θ) = 8 cos^4 (θ) − 8 cos^2 (θ) + 1

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Q: Roll a fair die repeatedly; X� represents the number of rolls it takes to get a six.

A: Roll a fair die repeatedly; X represents the number of rolls it takes to get a six.

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A: Multiply

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Types of Bias

Statistics is the study of data collection, organization, analysis, interpretation, and presentation. Statistical bias is a characteristic of a statistical technique or its findings in which the expected value deviates from the actual root quantitative parameter being estimated. According to the actual definition of bias, it refers to the tendency of a statistic to overestimate or underestimate a parameter.