PLEASE HELP. Select all the correct answers. Which sequences of transformations applied to shape I prove that shape I is similar to shape II?

reflection across the x-axis, followed by a reflection across the y-axis, and then a dilation by a scale factor of 0.5

a 90° counterclockwise rotation about the origin, and then a dilation by a scale factor of 0.5

a 180° counterclockwise rotation about the origin, and then a dilation by a scale factor of 0.5

a translation 2 units down and 5 units left, and then a dilation by a scale factor of 0.5

Researchers are conducting experiments to determine the role of alcohol in the development of depression. after the study is complete, they determine that the relative risk of developing depression is 1.55 with a 95 % ci of 1.2 -1.9. each group is then divided into nonsmokers and smokers. the relative risk for the nonsmokers is 1.12 with a 95% ci of 0.87-1.37. the relative risk for the smokers is 1.7 with a 95 % cl of 1.5-1.9. what type of bias may affect this study? a. procedure bias b. recall bias c. selection bias d. confounding e. lead-time bias