2. Suppose that in a random sample of 50 adults, 41 were registered to vote. Construct...
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. 4. The sample standard deviation of the ages of a random sample of 40 television sets in a neighborhood is 3 years. Find a 95% confidence interval for the standard deviation of the entire population of...
1. Find the sample size needed to estimate the proportion of houses that have security systems if the sample proportion h = 0.19, the margin of error is 0.02, and the confidence level is 90%. 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.
#13 13) A random sample of 50 voters found that 46% were going to vote for a certain 13 candidate. Find the 95% limit for the population proportion of voters who will vote for that candidate.
What percent of eligible Americans vote? In 2008, a random sample of 500 American adults was taken and we found that 68% of them voted. How many of the 500 adults in the sample voted? Now construct a 95% confidence interval estimate of the population percent of Americans that vote and write a sentence to explain the confidence interval.
A random sample of 60 voters found that 42% were going to vote for a certain candidate. Find the 99% limit for the population proportion of voters who will vote for that candidate.
In a random sample of 400 registrered voters, 120 indicated they plan to vote for Candidate A. Determine a 95% confidence interval for the proportion of all the registered voters who will vote for Candidate A.
3 Construct a 90% confidence interval for the following random sample of Lucas Barrett's golf scores for a particular golf course he played so that he can figure out his true (population) aver 95 92 95 99 92 84 95 94 95 86 (hint: Use T-distribution table. Formula Interval estimate of a population mean when stan age score for the dared deviation is unknown) 4 The auto industry relies heavily on 0% financing to entice customers to purchase cars. In...
In a random sample of 100 registered voters, 20 say they plan to vote for Candidate A.Determine a 95% confidence interval for the proportion of all the registered voters who will vote for Candidate A.You are interested in knowing support for candidate by gender to provide strategic advice to candidate B. Suppose your guess based on previous knowledge is that female support for candidate B is around 20 percent, and male support for candidate B is around 50 percent. Suppose...
In a large hospital, a nursing director selected a random sample of 38 registered nurses and found that the mean of their ages was 31.9. The population standard deviation for the ages is 4.2. She selected a random sample of 28 nursing assistants and found the mean of their ages was 29.5. The population standard deviation of the ages for the assistants is 6.0. Find the 99% confidence interval of the differences in the ages. Use μ1 for the mean...
Random sample of 330 voters, finding 144 who says that will vote “yes” on the upcoming school budget e chronicle polls a random sample of 330 voters, finding 144 who says that will vote "yes" on the upcoming school budget. What is the value of the sample proportion? What is the value of the standard error? Have we met the conditions to construct a 1-proportion z interval? Construct a 95% confidence interval for the actual sentiment of all the voters.