A study of the relationship between age and various visual functions (such as acuity and depth perception) reported the following observations on the area of scleral lamina (mm2) from human optic...

Extracted text: A study of the relationship between age and various visual functions (such as acuity and depth perception) reported the following observations on the area of scleral lamina (mm2) from human optic nerve heads: 2.74 2.52 2.78 3.94 2.36 2.65 3.94 4.28 3.98 4.25 3.51 4.42 2.34 3.70 2.80 3.63 3.05 (a) Calculate Ex¡ and Ex;2. (Round Ex;² to two decimal places.) Σχ- mm2 %3D Ex,? = mm4 %3D (b) Use the values calculated in part (a) to compute the sample variance s² and then the sample standard d&viation s. (Round your answers to three decimal places.) s2 = mm 4 %3D mm2