e. Why is the model prediction uncertain? Why do we have confidence intervals (for the mean prediction and the overall prediction)? f. Why is the difference between the confidence intervals of the mean prediction and the overall prediction?
E. Why is the model prediction uncertain? Why do we have confidence intervals (for the mean predi...
Explain in words why when we create confidence intervals and prediction intervals using a transformed response variable Y we can’t simply take the inverse transformation of the endpoints to get a confidence or prediction interval in the original units of Y .
Discuss the importance of constructing confidence intervals for the population mean. What are confidence intervals? What is a point estimate? What is the best point estimate for the population mean? Explain. Why do we need confidence intervals?
Why do we not calculate confidence intervals for a census and population parameters?
two 95% mean confidence intervals indicate a difference between means at the alpha = .05 level when? a. the endpoints do not touch b. the endpoints just barely overlap c. the endpoints overlap by about 25% of their range D. we cannot use a single mean confidence intervals to determine differences
#2 Options
The Prediction Interval would:
-be identical to the confidence interval-
-have the same center as, but would be narrower than the
confidence interval-
-be to the left of the confidence interval-
-be to the right of the confidence interval-
-have the same center as, but would be wider than the confidence
interval-
#3 Options
The interval computed from a mileage of 31.0 would:
-be narrower but have the same center-
-be wider but have the same center-
-be...
In class we had 41 95% confidence intervals that we believe to be calculated correctly. The confidence intervals were collected by taking a sample of 60 data points from the population data. 41 of the confidence intervals appear to be calculated correctly. Of these 4 of them do not have the population mean inside the confidence interval. Based on a 95% confidence, we expected 2 to not contain the population mean. Did this happen by chance alone? To find your...
In class we had 41 95% confidence intervals that we believe to be calculated correctly. The confidence intervals were collected by taking a sample of 60 data points from the population data. 41 of the confidence intervals appear to be calculated correctly. Of these 4 of them do not have the population mean inside the confidence interval. Based on a 95% confidence, we expected 2 to not contain the population mean. Did this happen by chance alone? To find your...
Build 90%, 95% and 99% confidence intervals for the population mean. We do not know standard deviation. Remember of “Chinese product” joke. [4 5 5 2 4 4 6 3 3 7 5 3 6 3 4 4 6 5 4 5 3 7 5 5 4 2 6 5 6 6]
Calculating confidence intervals will give us the exact estimate of the population mean Select one: a. every time, that's why we use them b. most of the time, depending on the sample we are using c. rarely, but we calculate them anyway d. never, but they do give us a range
O CONFIDENCE INTERVALS AND HYPOTHESIS TESTING Confidence interval for the difference of population means: Use ... A light bulb manufacturer wants to compare the mean lifetimes of two of its light bulbs, model A and model B. Independent random samples of the two models were taken. Analysis of 10 bulbs of model A showed a mean lifetime of 1240 hours and a standard deviation of 89 hours. Analysis of 14 bulbs of model B showed a mean lifetime of 1253...