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Author Question: Two fire alarms A and B are tested independently to determine if there is a statistical difference ... (Read 78 times)

scienceeasy

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on: Jul 24, 2018
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


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tdewitt

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Reply #1 on: Jul 24, 2018
Answer to Question 1

1

Answer to Question 2

1


scienceeasy

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Reply #2 on: Jul 24, 2018
TY


tdewitt

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Reply #3 on: Jul 24, 2018
You're welcome


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