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 = “$f(x,y) = cxy$ is a joint pdf on $[0,1]× [0,1]$. What is the value of $c$?"; wl(s); wl(kp); partName = problemNumber; problemName = “prob” + partName; buttonLabel = “Check problem " + partName; writeNumericBox(partName+"id”, 4, buttonLabel, 0.01, kuseCorrectVal); wl(kp); whr(kdivcol,kdivwid);
//Problem 2 problemNumber++; wl(problemheader(problemNumber)); var s; var partName, problemName, buttonLabel, answerArray, correct; s = “Consider the following joint probability table."; wl(s); wl(kp); wl(‘’); wl(kp); s = “(a) What is the probability that $X ≤ 2$ and $Y ≤ 2$?” wl(s); wl(kbr); partName = problemNumber + " (a)"; problemName = “prob” + partName; buttonLabel = “Check problem " + partName; correct = “1/4”; var answerArray = [correct, “5/24”,“1/6”,“1/8”]; writeMultipleChoiceRadioGroup(answerArray, problemName, correct, buttonLabel); wl(kp); s = “(b) What is the marginal probability $X = 1$?” wl(s); wl(kbr); partName = problemNumber + " (b)"; problemName = “prob” + partName; buttonLabel = “Check problem " + partName; correct = “1/6”; var answerArray = [“1/4”,“5/24”,correct,“1/8”]; writeMultipleChoiceRadioGroup(answerArray, problemName, correct, buttonLabel); wl(kp); s = “(c) Are $X$ and $Y$ independent?"; wl(s); wl(kbr); partName = problemNumber + " (c)"; problemName = “prob” + partName; buttonLabel = “Check problem " + partName; correct = “Yes”; var answerArray = [correct, “No”]; writeMultipleChoiceRadioGroup(answerArray, problemName, correct, buttonLabel); wl(kp); whr(kdivcol,kdivwid);