CASE 13. 2 applying SPSS (Analyze > Assess Means > Paired Trials T Test)
To measure the response periods of fire departments compared with secours services in three metropolitan centers to determine whether defibrillators should be included in fire automobiles.
A prospective sample of were accumulated over a period from March 1, 1994, to September 31, year 1994 where most call for secours and open fire departments had been monitored in three cities Cambridge, Kitchener and Waterloo.
Considering that the samples happen to be independent there is absolutely no relationship involving the observations in one sample plus the observations inside the other two samples. Therefore a matched pairs trial and error design is used to compare the response interval with the fire office with that with the ambulance support for each call.
Assess two masse of interval data. The parameter are the differences between two means m1-m2, where m1 = ambulance mean period
m2 = fire department mean time
To ascertain whether fireplace truck arrives at the scene on average more than 1 day sooner than a great ambulance, the alternative hypothesis will specify that m1 is definitely greater than m2: H0: (m1-m2) = one particular or maryland = one particular
H1: (m1-m2) > one particular or mD > one particular
In a pair of three of the urban centers, the imply is considered for the minutes the fact that fire departments arrived about scene. And two cities, the fire division arrives on scene higher than a minute earlier than the mat service:
Cambridge (n = 571, mean sama dengan 2 . twenty two min, s < zero. 0001)
Kitchener (n sama dengan 1, 011, mean = 1 . twenty-four min, s < zero. 003)
Waterloo (n = 300, indicate = zero. 69 min, p < 0. 98)
This we could conclude the shorter response interval of fireplace departments implies training the personnel and placing defibrillators on fire response vehicles in an effort to decrease the a chance to defibrillation to get cardiac arrest patients.