USE THE FOLLOWING INFORMATION FOR QUESTIONS 19 - 23.

DATA AT THE BOTTOM OF ALL THE QUESTIONS

19. An analysis is conducted to explain husband's age at marriage (years) with the wife's age at marriage (years).

The data and output of the analysis are found in the Excel sheet for this question.

Calculate the 90% confidence interval for the slope. Answer in ascending order to three decimal places.

90% CI for the slope = ( ____ , _____ )

20. To ensure that the confidence interval in the previous question is valid, you should check the assumptions and conditions for linear regression.

The next five questions include plots that were created to help check the different assumptions/conditions. For each plot, you will select the assumptions/conditions that can be checked with that plot.

Plot Acan be used to check which of the following assumptions/conditions? Select all that apply.

\fPlot B 45 . . Husband's age at marriage (years) 8 20 30 40 50 Wife's age at marriage (years)Plot C LO Residual values O LO -10 0 50 100 150 Observation number