Question

1. You want to know whether national disasters significantly affect anxiety. You use an established anxiety scale with μ = 50, σ = 45). You sample N = 87 individuals from San Francisco right after a major earthquake, and the sample has M = 70. Identify the independent (+levels) and dependent variables. Does the independent variable significantly affect the dependent variable? What do you conclude? Use ɑ = 0.05.

Answer 1

Sol:

Ho:μ = 50

Ha:μ not = 50

alpja=0.05

Independent variable-national disasters

dependent variable-anxiety

z=xbar-mu/s/sqrt(n)

z=(70-50)/(45/sqrt(87)

z=4.145502

p value in excel is

=NORM.S.DIST(-4.145502,TRUE)

=1.69535E-05

=2*1.69535E-05
P=3.3907E-05

p=0.000034

p<0.05

Reject Ho

Accept Ha

Conclusion:
There is suffcient statistical evidence at 5% level of signiifcance to conlcude that national disasters significantly affect anxiety