Question;University of Phoenix Material;Time to Practice ? Week Four;Complete Parts A, B, and C below.;Part A;Some questions in Part A;require that you access data fromStatistics for People Who (ThinkThey) Hate Statistics.This data is available on the student website;under the Student Text Resources link.;1. Using the data in the file named Ch. 11 Data Set 2;test the research hypothesis at the.05 level of significance that boys raise;their hands in class more often than girls. Do this practice problem by hand;using a calculator. What is your conclusion regarding the research hypothesis?;Remember to first decide whether this is a one- or two-tailed test.;2. Using the same data set (Ch. 11 Data Set 2), test;the research hypothesis at the.01 level of significance that there is a;difference between boys and girls in the number of times they raise their hands;in class. Do this practice problem by hand using a calculator. What is your;conclusion regarding the research hypothesis? You used the same data for this;problem as for Question 1, but you have a different hypothesis (one is;directional and the other is nondirectional). How do the results differ and;why?;3. Practice the following problems by hand just to see;if you can get the numbers right. Using the following information, calculate;the t test statistic.;a.;14X1 = 62 X2 = 60 n1 = 10 n2 = 10 s12= 6 s22= 10">;b.;14X1 = 158 X2 = 157.4 n1 = 22 n2 = 26 s12= 4.23 s22= 6.73">;c.;14X1 = 200 X2 = 198 n1 = 17 n2 = 17 s12= 6 s22= 5.5">;4. Using the results you got from Question 3 and a;level of significance at.05, what are the two-tailed critical values;associated with each? Would the null hypothesis be rejected?;5. Using the data in the file named Ch. 11 Data Set 3;test the null hypothesis that urban and rural residents both have the same;attitude toward gun control. Use IBM? SPSS?software to;complete the analysis for this problem.;6. A public health researcher tested the hypothesis;that providing new car buyers with child safety seats will also act as an;incentive for parents to take other measures to protect their children (such as;driving more safely, child-proofing the home, and so on). Dr. L counted all the;occurrences of safe behaviors in the cars and homes of the parents who accepted;the seats versus those who did not. The findings: a significant difference at;the.013 level. Another researcher did exactly the same study, everything was;the same?same type of sample, same outcome measures, same car seats, and so on.;Dr. R?s results were marginally significant (recall Ch. 9) at the.051 level. Which;result do you trust more and why?;7. In the following examples, indicate whether you;would perform a t test of independent;means or dependent means.;a. Two groups were exposed to different treatment levels;for ankle sprains. Which treatment was most effective?;b. A researcher in nursing wanted to know if the;recovery of patients was quicker when some received additional in-home care;whereas when others received the standard amount.;c. A group of adolescent boys was offered;interpersonal skills counseling and then tested in September and May to see if;there was any impact on family harmony.;d. One group of adult men was given instructions in;reducing their high blood pressure whereas another was not given any;instructions.;e. One group of men was provided access to an exercise;program and tested two times over a 6-month period for heart health.;8. For Ch. 12 Data Set 3, compute the t value and write a conclusion on whether;there is a difference in satisfaction level in a group of families? use of;service centers following a social service intervention on a scale from 1 to;15. Do this exercise using IBM?SPSS?software, and report;the exact probability of the outcome.;9. Do this exercise by hand. A famous brand-name;manufacturer wants to know whether people prefer Nibbles or Wribbles. They;sample each type of cracker and indicate their like or dislike on a scale from;1 to 10. Which do they like the most?;Nibbles rating;Wribbles rating;9;4;3;7;1;6;6;8;5;7;7;7;8;8;3;6;10;7;3;8;5;9;2;8;9;7;6;3;2;6;5;7;8;6;1;5;6;5;3;6;10. Using the following table, provide three examples;of a simple one-way ANOVA, two examples of a two-factor ANOVA, and one example;of a three-factor ANOVA. Complete the table for the missing examples. Identify;the grouping and the test variable.;Design;Grouping variable(s);Test variable;Simple ANOVA;Four levels of hours of;training?2, 4, 6, and 8 hours;Typing accuracy;Enter Your Example Here;Enter Your Example Here;Enter Your Example Here;Enter Your Example Here;Enter Your Example Here;Enter Your Example Here;Two-factor ANOVA;Two levels of training;and gender (two-way design);Typing accuracy;Enter Your Example Here;Enter Your Example Here;Enter Your Example Here;Enter Your Example Here;Three-factor ANOVA;Two levels of training;two of gender, and three of income;Voting attitudes;Enter Your Example Here;Enter Your Example Here;11. Using the data in Ch. 13 Data Set 2 and the IBM?;SPSS?software, compute the F ratio for a comparison between the three levels representing the;average amount of time that swimmers practice weekly (25;hours) with the outcome variable being their time for the 100-yard freestyle. Does;practice time make a difference? Use the Options feature to obtain the means for;the groups.;12. When would you use a factorial ANOVA rather than a;simple ANOVA to test the significance of the difference between the averages of;two or more groups?;13. Create a drawing or plan for a 2 ? 3 experimental;design that would lend itself to a factorial ANOVA. Identify the independent;and dependent variables.;From Salkind (2011). Copyright ? 2012;SAGE. All Rights Reserved. Adapted with permission.;PartB;Some questions;in Part B require that you access data fromUsing SPSS for Windows and;Macintosh. This data is available on the student website under the;Student Text Resources link.;The data for Exercise;14 is in the;data file named Lesson 22 Exercise File 1.;14. John is interested in determining if a new teaching;method, the involvement technique, is effective in teaching algebra to first;graders. John randomly samples six first graders from all first graders within;the Lawrence City School System and individually teaches them algebra with the;new method. Next, the pupils complete an eight-item algebra test. Each item;describes a problem and presents four possible answers to the problem. The;scores on each item are 1 or 0, where 1 indicates a correct response and 0;indicates a wrong response. The IBM?SPSS? data file;contains six cases, each with eight item scores for the algebra test.;Conduct a one-sample t test on;the total scores. On the output, identify the following;a. Mean algebra score;b. T test value;c. P value;The data for Exercise;15 is in thedata;file named Lesson 25 Exercise File 1.;15. Marvin is interested in whether blonds, brunets;and redheads differ with respect to their extrovertedness. He randomly samples;18 men from his local college campus: six blonds, six brunets, and six;redheads. He then administers a measure of social extroversion to each;individual.;Conduct a one-way ANOVA to investigate the relationship between hair;color and social extroversion. Conduct appropriate post hoc tests. On the;output, identify the following;a. F ratio for the group effect;b. Sums of squares for the hair color effect;c. Mean for redheads;d. P value for the hair color effect;From Green & Salkind;(2011). Copyright ? 2012 Pearson Education. All Rights Reserved. Adapted with;permission.;PartC;Complete the questions below. Be specific and provide examples when relevant.;Cite any sources consistent;with APA guidelines.;Question;Answer;What is meant by independent samples?;Provide a research example of two independent samples.;When is it appropriate to use a t test for dependent samples? What is;the key piece of information you must know in order to decide?;When is it appropriate to use an ANOVA?;What is the key piece of information you must know in order to decide?;Why would you want to do an ANOVA when;you have more than two groups, rather than just comparing each pair of means;with a t test?
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