Wikipedia
confidence interval : In statistics a robust confidence interval is a robust modification of confidence intervals, meaning that one modifies the non-robust calculations of the confidence interval so that they are not badly affected by outlying or aberrant observations in a data-set. In the process of weighing 1000.. More from Wikipedia
confidence interval : In Bayesian statistics, a credible interval is a posterior probability interval which is used for interval estimation in contrast to point estimation. Credible intervals are used for purposes similar to those of confidence intervals in frequentist statistics and an alternative terminology.. More from Wikipedia
The formula for the confidence interval for a variance is _________ .
The formula for the confidence interval for a variance is _________ . => IV. or II. or III. or I...
What is meant by 95% confidence interval of the mean?
What is meant by 95% confidence interval of the mean? => 95% of the specific sample means will fall within ± 1.96 standard errors of the population mean. or 95% of the specific sample means will fall within ± 2.58 standard errors of the population mean. or There is..
Statistics Confidence Interval Definition and formula
Amir H. Ghaseminejad shows the meaning of Confidence Interval with a simple example
Question : "Loss of identity at high elevations"
Zone 1:
7000-7500 ft,
# of Artifacts: 112,
# Unidentified: 69
Zone 2:
5000-5500 ft
# of Artifacts: 140
# Unidentified: 26
Let p1 be the population proportion of unidentified archaelogical artifacts at the elevation zone 7000-7500 ft. Let p2 be the population proportion of unidentified archaelogical artifacts at the elevation zone 5000-5500 ft.
a) Find a 99% confidence interval for p1-p2
b) Explain the meaning of the confidence interval in ..
Answer : 1) first find the difference in proportions 2) then find sigma 3) then find the z value associated with .99 1) (69/112) - (26/140) = 0.430357143 2) this equation is huge here it is http://davidmlane.com/hyperstat/B31858.html sigma = 0.056498026 3) z value for 99% confidence interval is 2.57 0.430357143 =/- (2.57 *0.056498026) = 0.575557069 =0.285157216 you are correct! The explanation: This indicates that we are 99% sure the proportion of unidentified artifacts at site #1 is between .285 to .576 higher than site #2. In other words we are very sure that there is a signifigant difference in the number of unidentified artifacts between the two sites... More from Yahoo Answers
Answer : 1) first find the difference in proportions 2) then find sigma 3) then find the z value associated with .99 1) (69/112) - (26/140) = 0.430357143 2) this equation is huge here it is http://davidmlane.com/hyperstat/B31858.html sigma = 0.056498026 3) z value for 99% confidence interval is 2.57 0.430357143 =/- (2.57 *0.056498026) = 0.575557069 =0.285157216 you are correct! The explanation: This indicates that we are 99% sure the proportion of unidentified artifacts at site #1 is between .285 to .576 higher than site #2. In other words we are very sure that there is a signifigant difference in the number of unidentified artifacts between the two sites... More from Yahoo Answers
Question : Suppose we consider a confidence intercal
estimate for a mean, for some sample data.
Suppose next we change ONLY the confidence
interval. How does the length of the
confidence intercal change, if at all? How
does this change the confidence level
affect the length of the confidence
interval? Explain the connection.
Answer : So you're asking... 1.if we change only the confidence interval, how does the length of the confidence interval change?????? What?? 2.How does the change in confidence level affect the length (or range) of a confidence interval? If we increase the confidence level (suppose 90% to 95%), the range of a confidence interval is increased. BECAUSE, in order for us to be MORE confident, we must make the range BIGGER so that we are less likely to be wrong... More from Yahoo Answers
Answer : So you're asking... 1.if we change only the confidence interval, how does the length of the confidence interval change?????? What?? 2.How does the change in confidence level affect the length (or range) of a confidence interval? If we increase the confidence level (suppose 90% to 95%), the range of a confidence interval is increased. BECAUSE, in order for us to be MORE confident, we must make the range BIGGER so that we are less likely to be wrong... More from Yahoo Answers
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