Even the smartest students need writing assistance at some point during their academic career. Should you lock yourself in a room and spend the entire weekend trying to write a paper? We promise you that the paper that you pay for won’t be resold or submitted elsewhere. It will also be written according to the instructions that you and your professor provide. Our excellent essays stand out among the rest for a reason. Don’t just take our word, check them out by yourself.
Order a Similar Paper Order a Different Paper
1) In a random sample of 810 women employees, it is found that 81 would prefer working for a female boss. What is the width of the 95% confidence interval for the proportion of women who prefer a female boss? Please show your calculations
2)Suppose the President wants an estimate of the proportion of the population who oppose a policy toward gun control. The President wants the estimate to be within .04 of the true proportion. Assume a 95 percent level of confidence. The Presidentâ€™s political advisors estimated the proportion supporting the current policy to be 0.60. How large a sample is required?
3) Explain whether the width of a confidence interval would increase, decrease, or remain the same as a result of each of the following changes:
a) The sample size is doubled, from 400 to 800
b) The population size is doubled, from 25 million to 50 million
c) The level of confidence is lowered from 95% to 90%
4) A financial institution wishes to estimate the mean balances owed by its credit card customers. The population standard deviation is estimated to be $300. If a 99 percent confidence interval is used and an interval of Â±$75 is desired, how many cardholders should be sampled?
5) A tire manufacturer wishes to investigate the tread life of its tires. A sample of 10 tires driven 50,000 miles revealed a sample mean of 0.32 inch of tread remaining with a standard deviation of 0.09 inch. Construct a 95 percent confidence interval for the population mean. Would it be reasonable for the manufacturer to conclude that after 50,000 miles the population mean amount of tread remaining is 0.30 inches? [compute the confidence of interval using t-distribution since Ïƒ is unknown]