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QNT 561 Week 3 Quiz




Question;QNT;561 Week 3 Quiz;1. What is;the level of significance of a test of hypothesis?;2. For each;of the following rejection regions, sketch the sampling distribution for;z and indicate the location of the rejection region and determine the;probability that a Type I error will be made;z1.645,zz>1.96, z>2.575;3. Several;years ago, a government agency reported the default rate on a certain type of;loan at 0.055. Set up the null and alternative hypotheses to determine if the;default rate this year is less than 0.055.;4. For the a;and observed significance level (p-value)pair, indicate whether the null;hypothesis would be rejected.;a=0.05;p-value=0.45;5.;A study;analyzes recent incidents involving terrorist attacks.;a. Do the;data indicate that the true mean number of suicide bombings for all terrorist;group attacks against this country differs from 3.5? Use a =0.01;p-value=0.0000;b.A 99%;confidence interval for the mean of the population was found to be 1.85?0.837.;c. Do the;inferences derived from part a and be agree?;d.What;assumptions about the data must be true for the inferences to be valid?;e. Comment;on the validity of the inference.;6. Suppose;41 of 111 randomly selected shoppers believe that ?Made in USA? means;that 100% of labor and materials are from the United States. Let p represent;the true proportion of consumers who believe ?Made in the USA? means 100% of;labor and materials are from the United States.;a.Calculate;a point estimate for p.;b. A claim;is made that p is 0.30. Set up the null and alternative hypotheses.;c.;Calculate;the test statistic for the test, part b.;d. Find the;rejection region for the test if a=0.10.;e. Make the;appropriate conclusion.;7. Independent;random samples from approximately normal populations produced the results shown;below.;Sample;1;Sample;2;43;67;20;53;38;60;38;52;47;57;40;22;21;32;40;34;60;50;59;65;a. Do the;data present sufficient evidence to conclude that mean 1-mean 2?0? Use a =0.01.;Find;the test statistic.;Find;the p-value.;Choose;the correct conclusion below.;b.;Construct;a 99% confidence interval for (mean1-mean2).;8.;The data;for a random sample of six paired observations are shown in the table.;Pair;Population;1 Sample (Observation 1);Population;2 Sample (Observation 2);1;9;8;2;2;2;3;6;4;4;1;3;5;5;6;6;5;5;a. Calculate;d and s_d^2.;b. What is;the 90% confidence interval for mean d?;c.;What is;the appropriate conclusion of the hypothesis test at a=0.10?;9.;Construct;a 95% confidence interval for (p1-p2) in each of the following;situations.;a.;n 1 =400;p 1 =0.66, n 2 =400, p 2 = 0.57.;b.;n 1 =180, p 1 =0.31, n 2 = 250, p 2 =0.27.;c. n 1;=100, p 1 =0.47, n 2 =120, p 2 =0.59.;10. A;newspaper reported the results of a survey on the planning habits of men and;women. In response to a question ?What is your preferred method of keeping;track of meetings?? 55 of men and 45 of women answered ?I keep them in my;head?. A nationally representative sample of 1,000 adults participated in;the survey, therefore, assume that 500 were men and 500 were women.;a. Set up;the null and alternative hypotheses for testing whether the percentage of men;who prefer keeping track of appointments in their head, p1, is larger than the;corresponding percentage of women, p2.;b.;Compute the test statistic for the test.;c. Give;the rejection region for the test, using a=0.01.;d. Find;the p-value for the test.;e. Make;an appropriate conclusion.;11. An auto dealer researching;customer preferences for cars asks customers which colors they prefer in a car;from a choice of red, yellow, black, and white. The data being collected can be;categorized as;12. Which of the following choices determines the;extent to which a measuring instrument measures what the researcher sets out to;measure?;13. Which;type of scale consists of statements that express either a favorable or;unfavorable attitude toward an object of interest?;14. The;assignment of numbers or symbols to a property of objects according to value or;magnitude is called;15. Rachel is conducting a;telephone interviews for Blockbuster. When she interviews customers of Netflix;she tends to change the wording of the question ?How loyal are you to using;Blockbuster? to ?So, you aren?t loyal to Blockbuster, are you?. Which of the;following sources of error in communication research is present in this;example?;16. Every;time a Netflix customer returns a DVD, Netflix asks the customer to evaluate;the DVD relative to other DVDs on a scale from one to five. Netflix is;using? question to learn customer preferences.;17. When;target questions present the participants with a fixed set of choices, they are


Paper#52180 | Written in 18-Jul-2015

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