homework, Basic Statistics

Problems


15. An art professor was interested in seeing what size group is best to prime the pump so to speak to encourage strangers to gather together in front of various exhibits at her art show, so she set up an experiment. In a municipal building off campus, she asked a group of two students to stand next to each other and stare intently at a wall decoration while simultaneously she asked a group of five students to do the same at the other end of the floor. For the next 30 minutes she observed passersby to see if they too looked at the decorations for more than five seconds or made comments about the artwork to members of either group.

Here is what she found: She observed 9 people make comments or look at the decorations for more than five seconds with respect to group of two (G2). Down the hallway, she observed 26 people look at the decorations or make comments to the group of five (G5). However, she found that 34 people just passed by G5 without noticing the decoration or making a comment. A smaller number (31) just walked past G2. Because G5 had more passers than participants, she concluded that placing two of her students in front of art displays would encourage strangers to do the same. Was this a good decision? Please support your answer with an appropriate test.


16. A professor is interested in knowing the correlation, if any, of students’ scores on the first exams given in her two classes.



Class 1 Class 2
92 86
90 87
89 85
82 90
88 79
92 90
100 92
91 84

Is there a significant correlation? Explain its statistical significance, if any.




17. With respect to the situation in question 16, what other test could the professor use that would yield valid results by looking for differences. What would be the statistical result of the test?

19. A professor was interested in determining if his students made significant improvements in their test scores?


Student Test 1 Test 2
Beth 86 92
Spud 87 90
Latinqua 85 89
Bubba 90 82
Spanky 79 88
Tabitha 90 92
Lisa 92 100
Jonathan 84 91




20. A professor teaches two different subjects (history and sociology) in an ethnically diverse college. She wants to know how much interest students have in prominent political figures. She reasons that knowing this will help her plan for future lectures.

She asked students to rate each person listed with a Lickert scale (a continuum with five being high and 1 being of low interest). Upon looking at the data results, she concluded that there is no need to emphasize any political figure more than the others. Indeed, she reckoned, students in each subject area rated the figures similarly, so she can pace her lessons just as she has in the past.

History students’ scores:

John Maynard Keynes 3.6
Jesus 4.1
Martin Luther King Jr. 4.0
Karl Marx 2.5
Patricia Ireland 2.6
Abraham Lincoln 4.5

Sociology students’ scores:

John Maynard Keynes 3.7
Jesus 4.2
Martin Luther King Jr. 3.9
Karl Marx 4.1
Patricia Ireland 4.0
Abraham Lincoln 3.8

Is her conclusion solid? Please provide a statistical assessment using an appropriate test to evaluate her decision.
Posted Date: 2/15/2013 2:32:59 PM | Location : United States







Related Discussions:- homework, Assignment Help, Ask Question on homework, Get Answer, Expert's Help, homework Discussions

Write discussion on homework
Your posts are moderated
Related Questions
It is 11:30pm on Thursday evening, New York City time. You are still recovering from your long haul flight from Sydney which arrived at JFK only hours ago. Thank your favourite dei

The following data relating cigarette smoking and death rates for lung cancers in 14 states in the USA. The data are based in part on records concerning 1960 cigarette tax receipts

While the differences between IFRS and GAAP are reducing, there still are significant differences between the two. While the IFRS has been developed by the IASB (International A


Marginal costing and Break-even analysis According to C.I.M.A. Manchester, "Marginal Price means the quantity at any given variety of result by which get worse scenario costs ar

Bond Relationship A debt gadget issued through a official or just the formal legal procedure and secured either by the pledge of detailed properties or revenues or by the general


If an exact answer isn''t possible, I really just need a guide. The company we are using is GameStop Corp, listed as GME on the NYSE. Using the supplied information and referring

Atomistic fallacy The fallacy which arises because of the association amongst the two variables at the individual level might differ from the association between the similar two

difference between tests of goodness of fit & tests of independence