Predicting housing median prices. The file BostonHousing. xls contains information on over 500 census tracts in Boston, where for each tract 14 variable values are recorded. The last column (CAT. MEDV) was derived from MEDV, such that it obtains the value 1 if MEDV>30 and 0 otherwise. Consider the goal of predicting and classifying the median value (MEDV and CAT. MEDV) of a tract, given the information in the first 13 columns (input variables) in the column list. Partition the data into training (60%) and validation (40%) sets.
a) Perform a k-nearest neighbors prediction with all 13 predictors (the CAT. MEDV column is the outcome or decision variable), trying values of k from 1 to 10. Make sure to normalize the data (click "normalize input data"). What is the best k chosen? What does it mean?
b) Why is the validation data error overly optimistic compared to the error rate when applying this kNNpredictor to new data?

Write a 3-4 page apa formatted paper comparing your organization’s it strategy with the best practices outlined in your course text. content should include, but not be limited to: developing and delivering on the it value, developing it strategy for the business value and linking it to business metrics. your paper should include an abstract and a conclusion and a reference page with 3-5 references

We as humans write math expression in infix notation, e.g. 5 + 2 (the operators are written in-between the operands). in a computer’s language, however, it is preferred to have the operators on the right side of the operands, i.e. 5 2 +. for more complex expressions that include parenthesis and multiple operators, a compiler has to convert the expression into postfix first and then evaluate the resulting postfix.write a program that takes an “infix” expression as input, uses stacks to convert it into postfix expression, and finally evaluates it. it must support the following operations: + - / * ^ % (example infix expression: (7 - 3) / (2 + 2)postfix expression: 7 3 - 2 2 + /result: 1guidelines: 1. you will need to use stacks in three placesa. one for the parenthesis check [char stack]b. one during infix to postfix [char stack]c. one during evaluation [int stack]for a and b above, you can use same array and same push, pop method as both ofthem are char. but for evaluation you have int stack and you might consider to createanother push pop method to handle it. maybe push_int, pop_int, etc. or find otherstrategy to utilize existing push pop method2. you can create a function for obtaining operator priority. that function should take anoperator as input and return its priority as an integer. this function will you a lot andreduce repeated code3. during evaluation you will need to convert char into integer. example for single digit: char c = '5'; int x = c - '0';

Rafael needs to add a title row to a table that he has inserted in word. what should he do? use the alignment options. use the merge and center option for all the cells in the top row. use the merge and center option on the first two cells in the top row. none of the above