Reading Questions Answer Checker
To check your answers put them in the appropriate box and click the ‘Check’ button. Every checker box can do arithmetic and calculate standard functions (see calculator help). If you give decimal answers, give them to at least 3 decimal places.
As you work you should have pencil and paper handy for calculations and thinking!
Note: some questions ask for a formula. For the checker we ask you to plug a value into the formula. For your pset you still need to give the whole formula.
//DEBUG PARAMETERS //Because we don’t show solutions for pset checkers we use //this to give a showanswer button during the debugging phase var debugans = undefined; //release //var debugans = kDebugAnswer; //debug problemNumber = 0; wl(“Calculator”); writecalculator(“psetcheckcalcid”, “Calculate”); whr(kdivcol,kdivwid);
//Problem 1 problemNumber++; wl(problemheader(problemNumber)); var s; var partName, problemName, buttonLabel, answerArray, correct; s = “Data $x$ follows a binomial(12, $θ$) distribution. To begin with you have no idea about $θ$ so you choose a flat prior. You run and experiment and find $x=3$. What is the posterior distribution?"; wl(s); wl(kbr) partName = problemNumber; problemName = “prob” + partName; buttonLabel = “Check problem " + partName; correct = “Beta(4, 10)"; var answerArray = [“binomial(12, 3)",“binomial(15, $θ$)",“Beta(3, 12)", correct]; writeMultipleChoiceRadioGroup(answerArray, problemName, correct, buttonLabel); wl(kp); whr(kdivcol,kdivwid);
//Problem 2 problemNumber++; wl(problemheader(problemNumber)); var s; var partName, problemName, buttonLabel, answerArray, correct; s = “True or false: Setting the prior probability of a hypothesis to 0 means that no amount of data will make the posterior probability of that hypothesis the maximum over all hypotheses."; wl(s); wl(kbr); partName = problemNumber; problemName = “prob” + partName; buttonLabel = “Check problem " + partName; correct = “True”; var answerArray = [correct,“False”]; writeMultipleChoiceRadioGroup(answerArray, problemName, correct, buttonLabel); wl(kp); whr(kdivcol,kdivwid);
//Problem 3 problemNumber++; wl(problemheader(problemNumber)); var s; var partName, problemName, buttonLabel, answerArray, correct; s = “True or false: It is okay to have a prior that depends on more than one unknown parameter."; wl(s); wl(kbr); partName = problemNumber; problemName = “prob” + partName; buttonLabel = “Check problem " + partName; correct = “True”; var answerArray = [correct,“False”]; writeMultipleChoiceRadioGroup(answerArray, problemName, correct, buttonLabel); wl(kp); whr(kdivcol,kdivwid);