Let >4 be the 10 x 10 tridiagonal matrix given by a,,- = 2, 1 = - 1, for each / 2,..., 9, and an = aio.io = 2, = aio,9 = 1. Let b be the 10-dimensional column vector given by b\ b\o \ and b, 0, for each i 2,3,... ,9. Solve 4x = b using the Crout factorization for tridiagonal systems.

Data: Any info we collect Statistic: Collect > Analyze > Summarize > Interpret > Draw a conclusion **Population: Whole set we are studying Sample: a subset of the population Take a sample randomly Data table: a chart to organize data ○ Variable: characteristics of a data table ○ Individual: information for one subject (person, animal, etc.) ○ Row: in a data table, each row is an individual ○ Column: in a data table, each column is a variable Qualitative data (Categorical Data): The calculation will not be meaningful, it is meant to group ● EX: grade, gender, eye color, hair color, zipcode ○ Qualit