Quizzes

An audiologist obtained a random sample of 16 volunteers from a community health clinic. From each participant, he obtained measures of vocabulary size (x₁), sensitivity to high frequency tones (x₂), digit span (x₃), verbal IQ (x₄), and ability to identify words in a noise environment (y). The sum of squares for y was 82. She submitted these results to a hierarchical regression with x₁, x₂, and x₃ entered on step 1, then x₄ was added on step 2. The sum of squares for the ŷ values was 16 on step 1, and 20 on step 2. Use the F-table to determine which of the following p-values BEST characterizes F_Change associate with ΔR².