Two fire alarms A and B are tested independently to determine if ...

[scienceeasy]

Two fire alarms A and B are tested independently to determine if there is a statistical difference in the mean amount of time it takes to wake up sleeping subjects. What inference can be made from the confidence interval below?
   Two-sample T for Alarm B vs Alarm A
   
   N Mean StDev SE Mean
   Alarm B 8 2.813 0.770 0.27
   Alarm A 7 1.680 0.826 0.31
   
   Difference = mu (Alarm B) - mu (Alarm A)
   Estimate for difference: 1.13250
   95 CI for difference: (0.22963, 2.03537)
   
  1.The interval suggests a statistically significant difference between the two alarms.
  2.The interval does not suggest a statistically significant difference between the two alarms.

Question 2

The number of degrees of freedom used in the two-sample t test for independent samples are the same as the degrees of freedom used in the construction of a confidence interval for 1 - 2.
  1.True
  2.False

[tdewitt]

Answer to Question 1

1

Answer to Question 2

1

[scienceeasy]

TY

[tdewitt]

You're welcome