You want to determine whether introverts or extraverts drink more at social func

Question

You want to determine whether introverts or extraverts drink more at social functions. You have sampled 50 students, 25 of whom are classified as introverts, and 25 who are extraverts. You then observe them at a party and record that 17 introverts drank while 8 did not, and that 10 extraverts drank while 15 did not. Is there a relationship between introversion/extraversion and drinking?

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

here we use chi-square test for relationship between introversion/extraversion and drinking

and chi-squre=sum((O-E)2/E)=3.95 with 1 df

critical chi-square(0.05,1)=3.84 is less than calculated chi-square=3.95, which means we reject the H0 in favor of H1.

null hypothesis H0: there is no relationship between introversion/extraversion and drinking

alternate hypothesis H1:there is relationship between introversion/extraversion and drinking

1.drink behaviour is dependent variable which is nominal and nature is independent variable which is nominal

2. null hypothesis H0: there is no relationship between introversion/extraversion and drinking

3.alternate  hypothesis H1: there is relationship between introversion/extraversion and drinking

4. each dependent and indpendent variable has 2 level

5.population:students who attend social function

a. IV(s): GPA is dependent

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

:ordinal

c. DV(s): mediation is independent variable

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

:nominal

e. Alt H:  

:there is relationship between meditation and GPA

f. null H:  

there is no relationship between GPA and meditaion

g. how many levels in IV(s)

: two level of independent variables

h. population:

student of undergraduate program

nature introverts extroverts drink yes 17 10 27 no 8 15 23 total 25 25 Eexpected(E) Observed(O) (O-E) (O-E)2/E E(17)= 27*25/50 13.5 17 3.5 0.907407407 E(10)= 27*25/50 13.5 10 -3.5 0.907407407 E(8)= 23*25/50 11.5 8 -3.5 1.065217391 E(15)= 23*25/50 11.5 15 3.5 1.065217391 total 50 50 0 3.945249597

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