Determine the sample size for a on-line survey with a variability of 30% and a 95% confidence interval?   What sample size would you need for a 99% confidence interval?  a 90% confidence interval?

Using the data attached, construct confidence intervals:  1. using the data provided, construct a confidence interval for each confidence level: confidence level: 50%, 80%, 95%, 99% 2. what happens to the EBM as the confidence level increases? Does the width of the confidence interval increase or decrease? Explain why this happens.

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magine that you conduct a study and estimate that the prevalence of hypertension among employees of a company. Your estimated prevalence is 24%. You also calculate a margin of error for a 95% confidence interval associated with this prevalence estimate of 3%.  What would be the 95% confidence interval for the prevalence calculated from this study?

Find the margin of​ error, using a​ 95% confidence​ level, for estimating the percentage of all young people who earned a high school diploma. ____?

The 95% confidence interval for the mean contains the sample mean with 95% certainty.TrueFalse

Treating the 2015 Tobacco rate data as a sample, construct a 95% confidence interval for the mean tobacco rate for males and for females. Interpret each interval. Does it appear that males use tobacco at a higher rate than females? Justify your answer, using the confidence intervals in your explanation. Construct the same confidence interval for males at the 99% confidence level. Compare to the male 95% confidence interval from the previous question. What happened to the interval when the confidence level increased? Explain why. Prevalence of smoking any tobacco product among persons aged >= 15 years Male 2015 Prevalence of smoking any tobacco product among persons aged >= 15 years Female 2015 51.2 7.6     37.2 27.8         29.5 18.4 52.3 1.5 16.7 13.1 35.5 34.8 46.5 0.4     48.8 7.6 39.8 0.7 13.1 0.9 46.2 10.6 26.5 20     17.7 1     30.5 17.1 47.2 30     19.3 11.3 29.3 3.1 42.4 28.2 36 4.5         22.2 3.5 44.1 2.8…

You sample 36 students to find out how many hours they spent online last week. Your sample mean is 54. The population standard deviation, sigma, is 8.2. Your client now wants the 90% confidence interval for this sample mean. It is: 40.1 to 67.9 51.8 to 56.2 40.5 to 67.5 51.0 to 56.0

Use the confidence interval to find the margin of error and the sample mean.   (.364,0.500)

Given this data: {4, 5, 8, 11, 16, 8},(a) Find the 90% confidence interval for the mean.(b) Interpret what does the interval mean?