Lab: Chi-square
For this lab use the Asthma Homeless Data file (Asthma_Homeless_Data.sav).
Data was collected from 144 students in Houston, on having asthma (or not), being homeless (or not), and
current housing situation (housed, homeless w/family, unaccompanied homeless, other).
1) Research Question: Is there an equal amount of students in each kind of housing situation?
Conduct a Chi-square Goodness of fit test to determine if students housing situations are equally
distributed is supported by the data at, α = .05.
a. What is the Alternative and Null Hypothesis for this analysis?
Alternative, H1:
Null, H0:
b. Calculate a 2 score using a Goodness of fit test in SPSS.
c. What is the Chi-Square (2) score?
The Chi-Square critical score (2-crit score; find in the Chi-Square table)?
The degrees of freedom (the exact number shown in the screenshot next to df) used to find it?
The p-value for this Chi-Square score (the number next to “Asymp. Sig.” in the screenshot?
2 score:
2-crit score:
df:
p-value:
d. Is the Chi-Square score greater or less than the Chi-Square critical score?
Is the associated p-value less than or greater than the alpha level of .05?
Is the Chi-Square statistically significant?
2 score > or < 2-crit score
p-value > or < than .05
Statistically significant
e. Do we reject or fail to reject the null hypothesis?
Reject or Fail to reject:
f. State the conclusion of your analysis (which is a restatement of the supported hypothesis).
2) Research Question: Is being homeless related to having asthma?
Conduct a Chi-square Test of independence to determine if a relationship between being homeless and
having asthmas is supported by the data at α = .05.
a. What is the Alternative and Null Hypothesis for this analysis?
Alternative, H1:
Null, H0:
b. Calculate a 2 score using a Test of independence in SPSS.
c. What is the Chi-Square (2) score (value next to “Pearson Chi-Square”)?
The Chi-Square critical score (2-crit score; find in the Chi-Square table)?
The degrees of freedom (exact number under df for the Pearson Chi-Square) used to find it?
The p-value for this Chi-Square score (number under “Asymp. Sig.” for Pearson Chi-Square)?
2 score:
2-crit score:
df:
p-value:
d. Is the Chi-Square score greater or less than the Chi-Square critical score?
Is the associated p-value less than or greater than the alpha level of .05?
Is the Chi-Square statistically significant?
2 score > or < 2-crit score
p-value > or < than .05
Statistically significant
e. Do we reject or fail to reject the null hypothesis?
Reject or Fail to reject:
f. State the conclusion of your analysis (which is a restatement of the supported hypothesis).