1. Find the sample size needed to estimate the proportion of houses that have security systems...
1:37 $$$ * NO G. 35% 119su20F.pdf Math 119 Final 1. Find the sample size needed to estimate the proportion of houses that have security systems if the sample proportion = 0.19, the margin of crror is 0.02, and the confidence level is 90%. 0
A) A certain region would like to estimate the proportion of voters who intend to participate in upcoming elections. A pilot sample of 25 voters found that 17 of them intended to vote in the election. Determine the additional number of voters that need to be sampled to construct a 95% interval with a margin of error equal to 0.06 to estimate the proportion. The region should sample ____ additional voters. B) Determine the sample size needed to construct a...
8. A campaign researcher would like to estimate the proportion of registered voters that will vote for his candidate. He runs a poll each week asking registered voters their candidate preference and calculates a 95% confidence interval to estimate the true proportion of registered voters that will vote for his candidate. On week 39 his confidence interval was (0.52, 0.56). On week 40 (the last week of the campaign) he wants to conduct one final poll. He would like his...
2. Suppose that in a random sample of 50 adults, 41 were registered to vote. Construct a 95% confidence level interval for the population proportion of registered voters 3. The mean age of sample of 100 cars from a certain manufacturer is found to be eleven years. If the sample standard deviation of car ages is 5 years, give a 99% confidence interval for the mean age of cars from this manufacturer.
Determine the sample size needed to construct a 95% confidence interval to estimate the average GPA for the student population at a college with a margin of error equal to 0.2. Assume the standard deviation of the GPA for the student population is 25 The sample size needed is (Round up to the nearest integer.) Determine the sample size n needed to construct a 90% confidence interval to estimate the population proportion for the following sample proportions when the margin...
Determine the sample sizen needed to construct a 95% confidence interval to estimate the population proportion for the following sample proportions when the margin of error equals 5% . a.p 0.70 b. p 0 80 c.p 0 90 Click the icon to view a table of standard normal cumulative probabilties a, nm (Round up to the nearest integer) Determine the sample sizen needed to construct a 95% confidence interval to estimate the population proportion for the following sample proportions when...
Determine the sample size needed in forming a 95% confidence interval for a proportion with margin of error of 0.04. (Use the “safe approach” for the population proportion (i.e., p=.50) Repeat part a.) for a margin of error of 0.02.
1. The center for Disease Control and Prevention wishes to estimate what proportion of the U. S. population gets the flu each year. In a random sample of adults in the U.S. collected in the year 2012, 12% got the flu that year. (a) Based on the information from the past sample in 2012, how large of a sample is needed to achieve a 0.02 margin of error with a 95% confidence level? (b) Using the most conservative approach, how...
The center for Disease Control and Prevention wishes to estimate what proportion of the U. S. population gets the flu each year. In a random sample of adults in the U.S. collected in the year 2012, 12% got the flu that year. (a) Based on the information from the past sample in 2012, how large of a sample is needed to achieve a 0.02 margin of error with a 95% confidence level? (b) Using the most conservative approach, how large...
Determine the sample size n needed to construct a 90% confidence interval to estimate the population proportion when p = 0.65 and the margin of error equals 7%. n= (Round up to the nearest integer.)