In politics, marketing, etc. we often want to estimate a percentage or proportion p. One calculation in statistical polling is the margin of error - the largest (reasonble) error that the poll could have. For example, a poll result of 72% with a margin of error of 4% indicates that p is most likely to be between 68% and 76% (72% minus 4% to 72% plus 4%).   In a (made-up) poll, the proportion of people who like dark chocolate more than milk chocolate was 37% with a margin of error of 2.5%. Describe the conclusion about p using an absolute value inequality.

Polls. America OnLine published a survey question. Among the 2,300 Internet users who responded, 20% answered “yes” and the others answered “no.” For the “yes” responses, what is the value of pn? What is fundamen-tally wrong with this survey?

Medical Marijuana? An international poll of physicians was conducted on the New England Journal of Medicine website asking “Do you believe that the overall medicinal benefits of marijuana outweigh the risks and potential harms?” Identify the a. specified attribute. b. population. c. population proportion. d. Of the 1446 physicians who responded, 76% said yes. Is the proportion 0.76 (76%) a sample proportion or a population proportion? Explain your answer.

We'd like to know the percentage of people living in California who owns a cell phone. How many people in California must be surveyed in order to be 95% confident that the sample proportion is in error by no more than 4 percentage points?

A marketing company is interested in the proportion of people that will buy a particular product. Match the vocabulary word with its corresponding example

Please answer questions below Below is a sample of 64 responses of a survey of Ward 3 residents in Washington, D.C.     The survey asked "Do you support the statehood of Washington, D.C.?"       "Yes" was recorded as "1" and "No" was recorded as "0" in the table.                           Statehood?   a. What is the sample proportion of residents who support DC statehood?   1                   1                   1                   1                   0                   1   b.  If the population proportion of residents who support DC statehood is 0.7,  1   what is the standard error of the proportion?       0                   0                   0                   1                   1   c. Is the sampling distribution of the proportion normally distributed?   0                   1                   1                   0                   1   d.  What is the probability of a sample proportion being greater than    1   the value of…

In politics, marketing, etc. we often want to estimate a percentage or proportion p. One calculation in statistical polling is the margin of error - the largest (reasonble) error that the poll could have. For example, a poll result of 72% with a margin of error of 4% indicates that p is most likely to be between 68% and 76% (72% minus 4% to 72% plus 4%). In a (made-up) poll, the proportion of people who like dark chocolate more than milk chocolate was 44% with a margin of error of 2.2%. Describe the conclusion about p using an absolute value inequality. The answer field below uses the symbolic entry option in Mobius. That lets you type in a vertical bar | to represent absolute values. Also, when you type in and then =, the symbolic entry option will automatically convert that to >.

A programmer plans to develop a new software system.  In planning for the operating system that he will use, hee needs to estimate the percentage of computers that use a new operating system.  How many computers must be surveryed in order to be 90% confident that his estimate is in error by no more than one percentage point.   Complete part (a) through (c) below. a. n= b  Assummer  that a recent survey suggests that about 86% of computers use a new operating system. c. Does the additional survey information from part (b) have much of an effect on the sample size that is required?

Find an article of your choice which uses proportions, and copy and paste the address of that article in this step. Identify at least one sample proportion within the article (you can list more than one if you like), and state what that sample proportion measures. For example, if you're told that the sample proportion of people in Renton who are taller than 5'11" is 80.7%, and you're also told that the sample size is 57, then you would state the proportion as 46/57 in your response for this part of the assignment. You will probably have to interpret what is being said in the article in order to be able to state specifically what the sample proportion represents. Also, you might not have x or n, you might only have the percentage or a decimal equivalent. Often, the size of the sample is stated somewhere in the article, and it's important to find that value. So, if n is given, please include it in this part of the assignment. If stated in the article, identify whether the sample is a…

a researcher wants to find the proportion.  what size sample should be obtained in order to be 90% confident that the sample proportion will not differ from the true proportion by more than 3%.  Round to nearest whole number