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##### QNT 561 Week 4 Quiz

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Question;QNT 561 Week 4 Quiz;1.;A new type of screening for lung cancer;CT, has been developed. Medical researchers believe that CT scans are more;sensitive than regular X-rays in pinpointing small tumors. A university is;conducting a medical trial of 50,000 smokers nationwide to compare the;effectiveness of CT scans with X-rays;for detecting lung cancer? One goal of the study is to compare the mean;ages when cancer is first detected by;the two screening methods.;2.;A study of Machiavellian traits in;consultants was performed? The consultants were then classified as having dishonest, neutral, or honest Mach;rating scores. The researcher investigated the impact of both Mach score and;gender on the average income of a consultant.;3.;Consider the dot plots A and B.;Plot A: Sample 1;6,7,8,8,9,10 Sample 2;12,13,14,14,15,16;Plot B: Sample 1: 5,5,7,11,13,13 Sample 2: 10,12,12,16,16,18;Plot A;Source;df;SS;MS;F;Treatment;1;108;108;54;Error;10;20;2;Total;11;128;Plot B;Source;df;SS;MS;F;Treatment;1;75;75;6.25;Error;10;120;12;Total;11;195;4.;The partially completed ANOVA table for a 3x4 factorial experiment with two;replications is shown below;Source;df;SS;MS;F;A;-;0.3;-;-;B;-;3.9;-;-;AB;-;9.6;-;-;Error;-;-;-;Total;-;18.7;5.;The table for problem 5 was missing, so we;didn?t have to complete problem 5.;6.;What conditions must n satisfy to make the;x^2 test valid?;n must be large enough so that for every cell the;expected cell count will be equal to 5 or more.;7.;The table to the right gives the breakdown;of the root causes of a sample of 87 industrial accidents. Are there;significant differences in the percentage of incidents in the four cause;categories? Use a=0.05.;System Cause;Number of Incidents;Design;29;Procedures;23;Management;22;Training;13;Total;87;Determine the null and alternative hypothesis for this;test.;Ho:p1=p2=p3=p4=0.25;8.;Find the rejection region for a test of;independence of two classifications;where the contingency table contains r rows and c columns.;a.;a=0.05, r=3, c=6;b.;a=0.10, r=6, c=3.;c.;a=0.01, r=2, c=5.;9.;Test the null hypothesis of independence;of the two classifications A and B of accompanying contingency table. Use;a=0.05.;B1;B2;B3;A1;42;71;44;A2;63;53;70;A3;31;37;30;Specify the null and alternative hypothesis.;Ho: The row and column classifications are;independent.;Ha: The row and column classifications are dependent.;Find the test statistics.;X^2=10.57.;Specify the rejection region.;X^2>9.48773.;State the conclusion.;Reject Ho, there is sufficient evidence to indicate;the row and column classification are dependent at a=0.05.;10.;Which term below refers to the descriptors;of variables computed from sample data used to estimate those same variables in;the population?;Sample statistics.;11.;Which term below refers to a controlled;randomized procedure that assures that each population element is given a;known, nonzero chance of selection into a study?s sample?;Probability sampling.;12.;When selecting a convenience sample;element selection is based on.;Accessibility.;13.;Involves assigning numbers or other;symbols to answers so that the responses can be grouped into a limited number;of categories.;Coding.;14.;Which type of chart uses bars to represent;data values such that each value occupies an equal amount of area within an;enclosed area?;Histogram.

Paper#52181 | Written in 18-Jul-2015

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