Posted by Ryan on Monday, February 7, 2011 at 7:50am.
Doing this assignment and was wondering if i got the right answers
According to the Census Bureau publication Current Population Reports, the probability distribution for household size (number of people per household, say X) in the United States is as follows. For the purpose of the next two questions, the experiment consists of randomly selecting a household in the United States and observing the number of people living there.
x 1 2 3 4 5 6 7
P(X = x) 0.16 0.32 0.05 0.31 0.10 0.05 0.01
How many people can we expect to see living in the randomly chosen household?
What is the probability that the randomly selected household will contain more than 4 people?
For the first one i got 1.79 and for the second i don't know if i did it right but i got .53
- Stats- need someone to check - drwls, Monday, February 7, 2011 at 10:23am
The expectation value, or mean value, is the sum of the x*P(x) products, which is 3.06
Of course, one would not expect to find 6% of a person in a house. On the other hand, 3 is a relatively unlikely number for this distribution. 2 and 4 are seen much more often.
I do not like the way the question is worded. If they want the mean vaue, they should say so.
For the second, you do not need to use a normal distribution and compute the standard deviation etc.. Just add P(5), P(6) and P(7). You get 0.16
- Stats- need someone to check - Ryan , Tuesday, February 8, 2011 at 3:17am
Answer This Question
More Related Questions
- Stats- NEED HELP - According to the Census Bureau publication Current ...
- Geometry - In the 2001 population census, information was collected about the ...
- Math - According to the U. S. Census Bureau, the total 2008 U.S. population was ...
- Algebra 2 - According to the US Census Bureau, the population of the United ...
- Critical thinking - I have finished my assignment I just need someone to read ...
- StatIstics - "Household size" is defined as the number of people living in a ...
- IT/205 - Read “The U.S. Census Bureau Field Data Collection Project: Don’t Count...
- math - According to the US Bureau of the Census, the world population in the ...
- precal - You can find the size of a population after t years using the formula N...
- math - The next three problems explore some techniques of data analysis. ...