Math
posted by Elie .
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"
Respond to this Question
Similar Questions

MathStatistics
I have a couple of questions that need reviewI've answered them, but I'm not sure if I'm correct. 1.)Suppose you interview 10 randomly selected workers and ask how many miles they commute to work. You'll compute the sample mean commute … 
statistics
Each person in random sample of 247 male and 253 female working adults living in Calgary, Canada was asked how long, in minutes, his or her typical daily commute was. use the accompanying summary statistics and an appropriate hypothesis … 
Statistics
18 workers at a large assembly plant were asked the time it took to commute to work. The data was analyzed in Minitab and the Descriptive Statistics for the data appears below. Descriptive Statistics: Minutes Variable N Mean Median … 
Statistics
A firm has 82 employees. The average commute distance (that is, the travel distance from home to work) of the employees is 6.2 miles. How many employees have a commute distance of less than 15.5 miles? 
AP Stats (math)
A large metropolitan area found that the time it takes for people to commute to work has a mean of 20.5 minutes and a standard deviation of 15.4 minutes. What is the probability that a random sample of 40 people have a mean commute … 
statistics
According to the Census Bureau's 2002 American Community Survey, the average travel time to work of workers 16 years and over living in Boston, MA, who did not work at home, was 28.2 minutes with a standard deviation of 0.79 minutes. … 
statistics
According to the Census Bureau's 2002 American Community Survey, the average travel time to work of workers 16 years and over living in Boston, MA, who did not work at home, was 28.2 minutes with a standard deviation of 0.79 minutes. … 
statistics
If the average commute time is 10.9 miles, but the average is actually the mean of a sample of 300 commuters and the sample standard deviation is 6.2 miles Estimate the true mean commute distance using 99% confidence level. 
statistics
The average oneway commute time for a random sample of 256 area residents of a city is 90 minutes, with a standard deviation of 24 minutes. Construct a 90% confidence interval for the mean commute time of all residents. Construct … 
statistics
given mean distance of 16 miles standard deviation of 8 miles with sample of 75 commuters what is probability of sample mean commute distance is greater that 13 miles Search instead for given mean distance of 16 miles standard deviation …