# Project #36141 - STATS

1.) From a sample of 500 items, 380 were found to be non-defective. The point estimate of the population proportion of defectives will be:

2.)A marketing research consultant hired by Coca-Cola is interested in determining the proportion of customers who favor Coke over other soft drinks. A random sample of 400 consumers was selected from the market under investigation and showed that 53% favored Coca-Cola over other brands. A 80% confidence interval for the true proportion of people who favor Coke is:

3.) A department store is interested in the average balance that is carried on its store’s credit card. A sample of 40 accounts reveals an average balance of \$1,250 and a standard deviation of \$350. Find a 95% confidence interval for the mean account balance on this store’s credit card:

4.) For sampling from a population that has a standard deviation of 200, what sample size would be needed to obtain a 95% confidence interval with width no more than 50?

5.) What is the correct Excel 2010 formula to calculate the upper tail z-score in obtaining 99% confidence interval of a population parameter?

6.) A 95% confidence interval for a population mean based on a sample has been calculated to be (20 , 30). We then double the sample size and calculate the 95% confidence interval based on the new sample. Which of the following can be a possible confidence interval?

7.) If we plot two normal probability distributions which have the same mean, the one which has a lower standard deviation will look :

8.) The opportunity for sampling error is decreased by

 Subject Mathematics Due By (Pacific Time) 07/22/2014 06:30 pm
TutorRating
pallavi

Chat Now!

out of 1971 reviews
amosmm

Chat Now!

out of 766 reviews
PhyzKyd

Chat Now!

out of 1164 reviews
rajdeep77

Chat Now!

out of 721 reviews
sctys

Chat Now!

out of 1600 reviews

Chat Now!

out of 770 reviews
topnotcher

Chat Now!

out of 766 reviews
XXXIAO

Chat Now!

out of 680 reviews