Question

In: Statistics and Probability

A survey found that the American family generates an average of 17.2 pounds of glass garbage...

A survey found that the American family generates an average of 17.2 pounds of glass garbage each year. Assume the standard deviation of the distribution is 2.5 pounds Find the probability that the mean of a sample of 35 families will be between 16.9 and 17.9 pounds. Assume that the sample is taken from a large population and the correction factor can be ignored. Round your final answer to four decimal places and intermediate -value calculations to two decimal places.

Solutions

Expert Solution

We are given that the population mean and the standard deviation . We also know that the sample mean then also follow a Normal distribution with mean and standard deviation .

Hence the  probability that the mean of a sample of 35 families will be between 16.9 and 17.9 pounds is

. Since follows a Normal distribution, we can transform to

to a standard Normal distribution. In our problem, n=35 and when ,

when

,

  

These probabilities will be calculated using NORM.S.DIST(-0.7099,true) function in EXCEL.


Related Solutions

A survey found that the American family generates an average of 17.2 pounds of glass garbage...
A survey found that the American family generates an average of 17.2 pounds of glass garbage each year. Assume population is normally distributed with standard deviation of 2.5 pounds. Find the probability that the mean of a sample of 55 families will generate between 17 and 18 pounds.
A survey found that the American family generates an average of 17.2 pounds of glass garbage...
A survey found that the American family generates an average of 17.2 pounds of glass garbage each year. Assume the standard deviation of the distribution is 2.5 pounds. Find the probability that the mean of a sample of 32 families will be between 16.4 and 17.4 pounds. Assume that the sample is taken from a large population and the correction factor can be ignored. Round your final answer to four decimal places and intermediate z-value calculations to two decimal places.
A survey found that Americans generate an average of 16 pounds of glass garbage each year....
A survey found that Americans generate an average of 16 pounds of glass garbage each year. Assume the standard deviation of the distribution is 3.4 pounds. Find the probability that the mean of a sample of 64 families will be between 14.6 and 17.8 pounds.
A survey found that Americans generate an average of 16 pounds of glass garbage each year....
A survey found that Americans generate an average of 16 pounds of glass garbage each year. Assume the standard deviation of the distribution is 3.4 pounds. Find the probability that the mean of a sample of 64 families will be between 14.6 and 17.8 pounds.
A survey conducted by the American Automobile Association showed that a family of four spends an average of $215.60 per day while on vacation.
  A survey conducted by the American Automobile Association showed that a family of four spends an average of $215.60 per day while on vacation. Suppose a sample of 64 families of four vacationing at Niagara Falls resulted in a sample mean of $252.45 per day and a sample standard deviation of $76.50. (a) Develop a 95% confidence interval estimate of the mean amount spent per day in dollars by a family of four visiting Niagara Falls. (Round your answers...
A survey conducted by the American Automobile Association showed that a family of four spends an...
A survey conducted by the American Automobile Association showed that a family of four spends an average of $215:60 per day while on vacation. Suppose a sample of 64 families of four vacationing at Niagara Falls resulted in a sample mean of $252:45 per day and a sample standard deviation of $74:50. Using a 98% confidence interval estimate, you wish to determine whether the average amount a family of four will spend when vacationing at Niagara Falls per day is...
A survey conducted by the American Automobile Association showed that a family of four spends an...
A survey conducted by the American Automobile Association showed that a family of four spends an average of $215.60 per day while on vacation. Suppose a sample of 64 families of four vacationing at Niagara Falls resulted in a sample mean of $252.45 per day and a sample standard deviation of $74.50. a. Develop a 95% confidence interval estimate of the mean amount spent per day by a family of four visiting Niagara Falls (to 2 decimals). ( , )...
A survey conducted by the American Automobile Association showed that a family of four spends an...
A survey conducted by the American Automobile Association showed that a family of four spends an average of $315.60 per day when on vacation. Assume that $315.60 is the population mean expenditure per day for a family of four and that $85.00 is the population standard deviation. Suppose that a random sample of 40 families will be selected for further study. What is the standard deviation of the sampling distribution of xbar values where xbar is the mean expenditure per...
The average weight of American adults increased by about 10 pounds in the 1990s. In November...
The average weight of American adults increased by about 10 pounds in the 1990s. In November of 2004, it was reported that U.S. airlines spent $275 million more in fuel costs to transport this additional weight. Under what circumstances would this increased cost be an externality of obesity, and under what circumstances would it not be an externality?
The Aluminum Association reports that the average American uses 56.8 pounds of aluminum in a year....
The Aluminum Association reports that the average American uses 56.8 pounds of aluminum in a year. A random sample of 50 households is monitored for one year to determine aluminum usage. If the population standard deviation of annual usage is 12.3 pounds, what is the probability that the sample mean will be each of the following? Appendix A Statistical Tables a. More than 60 pounds d. Less than 55 pounds
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT