Sunday

December 21, 2014

December 21, 2014

Posted by **caintgetrite** on Thursday, November 4, 2010 at 11:19pm.

- MATH -
**PsyDAG**, Friday, November 5, 2010 at 10:54amFirst, please do not use all capitals. Online it is like SHOUTING. Not only is it rude, but it is harder to understand. Thank you.

What is your question?

- MATH -
**Anonymous**, Wednesday, April 3, 2013 at 7:19pmSuppose that the population proportion of Internet users who say that they use Twitter or another service to post updates about themselves or to see updates about others is 19%. Think about selecting random samples from a population in which 19% are Twitter users.

- STAT -
**Please Help!!**, Thursday, August 7, 2014 at 10:14pm1. In a study of the income of U.S. factory workers, a random sample of 100 workers shows a sample mean of $35,000. Assume that the population standard deviation is $4,500, and that the population is normally distributed.

A) Compute the 90%, 95% and 99% confidence intervals for the unknown population mean.

B) Briefly discuss what happens to the width of the interval estimate as the confidence level increases. Why does this seem reasonable?

2. In a study of the starting salary of college graduates with degrees in Accounting, a random sample of 80 graduates shows a sample mean of $36,000 and a sample standard deviation of $2,500. Assume that the population is normally distributed.

A) Compute and explain a 95% confidence interval estimate of the population mean starting salary for Accounting graduates.

3. A telephone poll of 950 American adults asked "where would you rather go in your spare time?" One response, by 300 adults, was "a movie". Compute and explain a 95% confidence interval estimate of the proportion of all American adults who would respond "a movie".

- MATH -
**Anonymous**, Monday, November 3, 2014 at 6:40pmIn a study of the starting salary of college graduates with degrees in Accounting, a random sample of 80 graduates shows a sample mean of $36,000 and a sample standard deviation of $2,500. Assume that the population is normally distributed.

**Answer this Question**

**Related Questions**

Statisitcs - The mean height of fully grown birch trees are 18 feet with a ...

Statistics/Probability - The standard deviation of the masses of articles in a ...

sample size/ standard deviations - How do we compute sample size fluctuations? ...

statistics - what are the mean and standard deviation of a sampling distribution...

statistics - How do we compute sample size fluctuations? Suppose we have a ...

Statistics - A normally distributed population has a mean of 40 and a standard ...

Math (Statistic) - Considered the sampling distribution of a sample mean ...

Statistics - This is the first question..... For a population that has a ...

statistics - Random samples of size n are selected from a normal population ...

statistics - The scores of students on the ACT college entrance examination in ...