homework, Basic Statistics


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
1. Comment on influence of study design, sampling strategy and scale of measurement of outcome variable, on your choice of analytical approach Study design: the study design i

Accounting Standards in word countries: Diverse countries like Peru, Australia, Kuwait, South Africa etc. have all started adopting the IFRS. The SEC has suggested that all compan

theorems of probability ..

What is a valuation account? In accounting, an assessment consideration is usually a stability sheet consideration that is used in combination with another stability sheet cons

1.)  Two dice are rolled and the sum is calculated.  Let X represent the sum of the two dice. Construct a probability distribution expressing probabilities in fractional form. 2

_______ 1. F''s share of income from various sources is as follows for the current year: Source F''s Share of Entity''s Net Income F''s Share of Distributions ABC Partnership after

the first four moments of a distribution about the mean are 0,16,-64 and 162.what is the standard deviation ?

Bond redemption The regaining of control of bonds formerly issued by expense of amount due to the owner.

Definition and examples of asset and liabilities