A poll for a statewide election has a margin of error of 1.92 percentage points. How many voters should be sampled for a 99% confidence interval? Round up to the nearest whole number.
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Critical values for quick reference during this activity.
Confidence level | Critical value |
---|---|
0.90 | �∗=1.645 |
0.95 | �∗=1.960 |
0.99 | �∗=2.576 |
![Critical values for quick reference during this activity.
Confidence level Critical value
1.645
0.90
0.95
0.99
488704.2995052.qx3zqy7
-
=
1.960
z* = 2.576
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A poll for a statewide election has a margin of error of 1.92 percentage points.
How many voters should be sampled for a 99% confidence interval? Round up
to the nearest whole number.
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- Consider a simple linear regression with the following results: Sample size:24 Estimated slope parameter:B1 = 0.31 Estimated standard error: 0.082 i. Test the following hypothesis with 5% significance level Но : В1 — 0 На : В +0 ii. Test the following hypothesis with 5% significance level Но : В — 0 На: В1 > 0 iii. Test the following hypothesis with 5% significance level. Show the rejection region in a graph. Ho : B1 = 0 На: В1 <0 iv. Test the following hypothesis with 5% significance level. Show the rejection region in a graph. Но : В — 0.5 HA : B1 7 0.5 v. Construct a 95% interval estimate of the slope parameter.e Levels Noise levels at various area urban hospitals were measured in decibels. The mean noise level in 165 ward areas was 59.2 decibels, and the population standard deviation is 4.2 . Find the 94% confidence interval of the true mean. Use a graphing calculator and round the answers to one decimal place.Facebook Friends Many people believe that the average number of Facebook friends is 140. The population standard deviation is 39.6. A random sample of 30 high school students in a particular county revealed that the average number of Facebook friends was 147. At a=0.10, is there sufficient evidence to conclude that the mean number of friends is greater than 140? Use the P-value method. Use a graphing calculator. Part 1 of 4 (a) State the hypotheses and identify the claim. Ho: 140 not claim H₁>140 claim This hypothesis test is a one-tailed Part: 1/4 Part 2 of 4 test. (b) Find the P-value. Round the answer to at least four decimal places. P-value=
- **Frequency distribution table** The city council was concerned that allowing more bars within city limits would increase the number of drunk drivers on city streets. A researcher was asked to statistically determine how many bar patrons exceed the legal limit for driving when leaving a bar. The researcher asked 20 bar patrons to take a test to determine their blood alcohol levels as they were leaving the bar. The scores are shown below. 0.05 0.08 0.09 0.12 0.03 0.07 0.09 0.12 0.10 0.06 0.10 0.02 0.08 0.00 0.07 0.00 0.14 0.02 0.11 0.10Use the accompanying Grade Point Averages data to find 80%, 85%, and 99% confidence intervals for the mean GPA Click the icon to view the Grade Point Averages data. www An 80% confidence interval for the mean GPA is (Use ascending order. Round to two decimal places as needed.) Gender Female Female Female Female Male Female Female Female Female Female Female Female Female Male Male Female Male Female Male Female Female Female Female Female Female Female Male Female Female Male Collage Nursing Nursing Arts and Sciences Arts and Sciences Engineering Nursing Nursing Education Arts and Scances Nursing Arts and Sciences Nursing Health Science Business Business Nursing Education Education Engineering Arts and Sciences Health Science Business Health Science Nursing Engineering Education Engineering Education Nursing Engineering GPA 3.20 3.26 3.13 3,61 3.00 3.67 3.36 3.45 3.50 3.20 2.68 3.40 3.76 3.74 3.75 3.48 2.92 3.80 3.51 3.72 3.28 3.26 3.70 3.40 3,17 3.44 3.87 3.29 3.25 3.72Question Help Use the sample data and confidence level given below to complete parts (a) through (d). A research institute poll asked respondents if they felt vulnerable to identity theft. In the poll, n= 1017 and x = 524 who said "yes." Use a 99% confidence level. 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What is a 99% confidence interval for the population mean? Accessib A 99% confidence interval for the population mean is (Use ascending order. Round to two decimal places as needed.) Purchas Commu Enter your answer in the edit fields and then click Check Answer. All parts showing Clear All Check Answer ns Type here to search acer F6 F8 R_________ error is the difference between a sample statistic and a population parameter that occurs due to chance. Sampling Standard Statistical HumanDATA ANALYSIS PROBLEM SOLVING The mean GPA for a random sample of 120 students from a large university is 2.71, with a sample standard deviation of 0.51. Make a 90% confidence interval for the university's average GPA.Hospital Noise Levels Noise levels at various area urban hospitals were measured in decibels. The mean noise level in 169 ward areas was 60.3 decibels, and the population standard deviation is 6.1 . Find the 96% confidence interval of the true mean. 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