The next table shows the results of this independent t test. At the .05 significance level, can you conclude that…

The next table shows the results of this independent t test. At the .05 significance level, can you conclude that there is a difference in their mean times? Explain these results to a person who knows about the t test for a single sample but who is unfamiliar with the t test for independent means.

 

 

Hypothesis Test: Independent Groups (t test, unequal variance)         

Prada

Oracle      

12.170

14.875

mean     

1.056

2.208

std. dev.     

10

12

n              

16

df      

-2.7050

difference (Prada – Oracle)    

0.7196

standard error of difference    

0

hypothesized difference            

-3.76

 t      

.0017

 p-value (two-tailed)             

-4.2304

confidence interval 95.% lower    

-1.1796

confidence interval 95.% upper    

1.5254

margin of error