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; s = “Which of the following represents a valid probability table?” wl(s); wl(kbr) wl(‘<td style="padding:4ex”;>’); wl('(i)’ + kbr); writetable([[‘outcomes’, 1, 2, 3, 4, 5], [‘probability’,‘1/5’,‘1/5’,‘1/5’,‘1/5’,‘1/5’]], “class='basicborder’", “class='basiccells’", “class='k’", 2); wl(‘’); wl('(ii)’ + kbr); writetable([[‘outcomes’, 1, 2, 3, 4, 5], [‘probability’,‘1/2’,‘1/5’,‘1/10’,‘1/10’,‘1/10’]], “class='basicborder’", “class='basiccells’", “class='k’", 2); wl(‘’); var problemName = “prob” + problemNumber; var buttonLabel = “Check problem " + problemNumber; var correct = ‘i and ii’; var answerArray = [‘i’,‘ii’,correct, ‘Not enough information’]; writeMultipleChoiceRadioGroup(answerArray, problemName, correct,buttonLabel); whr(kdivcol,kdivwid);
//Problem 2 problemNumber++; wl(problemheader(problemNumber)); wl(kp) var s; s = [“A sample space has exactly two outcomes. The first has probability”, ml(‘p’), " and the second has probability”, ml(‘3p.'), " What is the value of”, ml(‘p’) + ‘?']; wl(s.join(’ ‘)); wl(kp); var buttonLabel = “Check problem " + problemNumber; writeNumericBox(problemNumber+"id”, .25, buttonLabel, 0.001, kuseCorrectVal); whr(kdivcol,kdivwid);
//Problem 3 problemNumber++; wl(problemheader(problemNumber)); wl(kp); var s; s = [“Let”, ml(‘A’), “and”, ml(‘B’), “be two events with”, ml(“P(A) = 0.4, P(B) = 0.5”), “and”, ml(“P(A ∩ B) = 0.3."), “What is”, ml(“P(A ∪ B)") + “?"]; wl(s.join(’ ‘)); wl(kbr + “(Hint: visualize with Venn diagrams.)"); wl(kbr); var problemName = “prob” + problemNumber; var buttonLabel = “Check problem " + problemNumber; var correct = 0.6 var answerArray = [0.5, correct, 0.7, 0.8, 0.9]; writeMultipleChoiceRadioGroup(answerArray, problemName, correct,buttonLabel); whr(kdivcol,kdivwid); //Problem 4 problemNumber++; wl(problemheader(problemNumber)); wl(kp); var s; s = [“Our experiment consists of tossing a coin 3 times. Take the sample space to be all sequences of 3 heads or tails.", mldisplay(“S = {HHH, HHT, HTH, HTT, THH, THT, TTH, TTT}"), “For each of the following give the size of the event."]; wl(s.join(” “)); wl(kp); var partName, problemName, buttonLabel, answerArray, correct; s = ["(i) The event ‘there are more heads than tails’."]; wl(s.join(” “)); wl(kp); partName = problemNumber + " (i)"; problemName = “prob” + partName; buttonLabel = “Check problem " + partName; correct = 4; answerArray = [0,1,2,3,correct,5,6,7,8]; writeMultipleChoiceRadioGroup(answerArray, problemName, correct, buttonLabel); wl(kp); s = ["(ii) The event ‘the first heads occurs after the first tails.'"]; wl(s.join(’ ‘)); wl(kp); partName = problemNumber + “(ii)"; problemName = “prob” + partName; buttonLabel = “Check problem " + partName; correct = 3; answerArray = [0,1,2,correct,4,5,6,7,8]; writeMultipleChoiceRadioGroup(answerArray, problemName, correct, buttonLabel); whr(kdivcol,kdivwid);