The produce buyer for Shaw\'s supermarket is trying to decide which of three dis

Question

The produce buyer for Shaw's supermarket is trying to decide which of three distributors to buy oranges from. They all will charge $.07 per orange, so she will decide between them on the basis of weight of the oranges (the best oranges are the heaviest). She goes to the three different distributors and randomly samples the weight of their oranges. Is there a significant difference in the weight of oranges produced by Distributors A, B, and C?

INSTRUCTIONS:

Each of the following is a description of a health-related study. In the table are spaces to answer each of the following questions about each study.

What is/are the independent variable(s)?

Is (are) the independent variable(s) nominal, ordinal, interval, or ratio?

What is the dependent variable?

Is the dependent variable nominal, ordinal, interval, or ratio?

What is the alternative hypothesis?

What is the null hypothesis?

How many treatments (levels) are there in each independent variable?

To what population does your conclusion apply?

Therapist Doe wants to determine if a newly developed meditation course improves student GPAs. His sample consists of 60 students who have recently entered an undergraduate program; 30 of them took the meditation course prior to the beginning of the semester, 30 did not. Dr. Doe has access to each subject's GPA.

a. IV(s):  

b. IV(s) nominal, ordinal, interval or ratio?

c. DV(s):  

d. DV(s) nominal, ordinal, interval or ratio?

e. Alt H:  

f. null H:  

g. how many levels in IV(s)

h. population:

a. IV(s):  

b. IV(s) nominal, ordinal, interval or ratio?

c. DV(s):  

d. DV(s) nominal, ordinal, interval or ratio?

e. Alt H:  

f. null H:  

g. how many levels in IV(s)

h. population:

Explanation / Answer

(a)

Distributors A, B, and C are the independent random variable.

(b)

It is a nominal variable.

(c)

Weight of oranges is the dependent random variable.

(d)

It is ratio level variable.

(e)

The alternative hypothesis is :

At least one mean weight of oranges produced by Distributors A, B, and C are different.

(f)

The null hypothesis is :

All mean weight of oranges produced by Distributors A, B, and C are same.

(g)

One level

(h)

Population of oranges produced by Distributors A, B, and C.

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