Posted by **Elie** on Wednesday, March 16, 2011 at 2:53am.

1.)Suppose you interview 10 randomly selected workers and ask how many miles they commute to work. You'll compute the sample mean commute distance. Now imagine repeating the survey many, many times, each time recording a different sample mean commute distance. In the long run, a histogram of these sample means represents:

a) the bias, if any, which is present in the sampling method

b)the true population average commute distance

c)simple random sample

d)the sampling distribution of the sample mean

I chose choice "d" but I was torn between that and choice "b"

2)The average age of residents in a large residential retirement community is 69 years with standard deviation 5.8 years. A simple random sample of 100 residents is to be selected, and the sample mean age of these residents is to be computed.

We know the random variable has approximately a normal distribution because of

Choose one answer.

a. the central limit theorem.

b. the law of large numbers.

c. the 68–95–99.7 rule.

d. the population we're sampling from has a Normal distribution.

I chose choice "a"

## Answer This Question

## Related Questions

- Math--Statistics - I have a couple of questions that need review--I've answered ...
- statistics - According to the Census Bureau's 2002 American Community Survey, ...
- statistics - According to the Census Bureau's 2002 American Community Survey, ...
- statistics - If the average commute time is 10.9 miles, but the average is ...
- statistics - given mean distance of 16 miles standard deviation of 8 miles with...
- Statistics - 18 workers at a large assembly plant were asked the time it took to...
- AP Stats (math) - A large metropolitan area found that the time it takes for ...
- Statistics - A firm has 82 employees. The average commute distance (that is, the...
- statistics - The average one-way commute time for a random sample of 256 area ...
- statystics - : Human Resources took a survey and found that the average commute ...

More Related Questions