### How to do the 95% confidence interval plot in EXCEL?

1, the first step is still to prepare the data we need. First, calculate the estimated value of Y in the vertical alignment. Calculated according to the regression equation, in cell C2 enter “= 0.48 * $ b2 – 2021.08”, press enter to calculate the results, and then drag down to generate the corresponding estimates of y at each point.

2, then we need to calculate the remaining e, in cell D2 enter “= $C2-$A2”, or drag down to generate the remaining columns.

3. Then calculate the square of the residual. In cell E2, enter “= D2^2”, select a cell in the right blank area. For example, in the cell enter “= and (E2:E20)” to calculate the residual sum of squares.

4. Next, we calculate the square of X. In cell F2, enter “=B2^2”, drag down to generate a column of squared values of X, and find a cell on the right side, for example, m3, and enter “=sum(F2:F20) “enter.”

5. Next, we calculate the estimation error and compute the mean value of X in cell K2.

6, we need to calculate the upper and lower bounds of the prediction interval, respectively, enter =$M$5-tinv (0.05,17)*$k$5″ as the lower limit value into cell J9, enter “=$M$5+tinv (0.05,17)*$k$5 ” as the upper limit value entered into cell K9

7, next, if we need to change the value of X, we just need to re-enter the new value of X in cell K3, and then press enter. In cells J3 and K3, we will calculate the lower and upper bounds of the Y prediction range.

### Confidence interval formula, how to find 95% confidence interval?

The formula for 95% confidence interval is shown below:

Significance of 95% confidence interval: Assuming that the result of the above statistic is [170-10,170+10], how does it mean that the minimum height is 160 and the maximum height is 180. this statistic has 95% confidence.

The 95% confidence interval is a method used to estimate the range of values of a parameter. For example, in an experiment where we use a sample to estimate the overall mean. Suppose that after we do an experiment with 100 sets of statistical means, and after we calculate the 95% confidence intervals, 95 of the confidence intervals contain the overall mean, and 5 do not.

What is the formula for calculating confidence intervals?

The formula for calculating confidence intervals depends on the statistics used. Confidence intervals are calculated at a predetermined level of significance, often called alpha, which in most cases is set to 0.05. The confidence level is (1-alpha), or 100 x (1-alpha)%.

If α = 0.05, then the confidence level is either 0.95 or 95%, with the latter representation being more commonly used. A common calculation of the confidence interval is Pr(c1<=μ<=c2)=1-α.

### What do the upper and lower 95% confidence intervals mean in SPSS orthogonal tests? Is this graph correct?

The 95% confidence interval should be calculated as Mean-1.96*SE<x≤Mean+1.96*SE, the full name of which should be the 95% confidence interval of the overall mean, which is statistically stated to be the probable range of the overall parameter where the overall parameter is located according to 95% estimation.

Mean-1.96*SE<x≤Mean+1.96*SE that range is the upper and lower limits