STATS HELP P VALUE HELP?
ID: 2918038 • Letter: S
Question
Why IS P VALUE ALMOST ZERO?The length of time to recovery was recorded for patients randomlyassigned and subjected to two different surgical procedures. Thedata, recorded in days, are as follows.
ni X¯i si2
Procedure - I 31 7.3 1.23
Procedure – II 35 8.9 1.49
a. Do the data present sufficient evidence to indicate a differencein mean recovery
times for the two surgical procedures? Take ? = 0.03.
b. Find the p-value for the test..
Answer: X1 = Recovery time for a patient subjected to surgicalprocedure – I
X2 = Recovery time for a patient subjected to surgical procedure– II
1 = True average recovery time for a patient subjected tosurgical procedure – I
2 = True average recovery time for a patient subjected tosurgical procedure – II
H0 : 1 – 2 = 0 vs H1 : 1 – 2 0
For = 0.03 Z/2 = 2.17. As | z – stat | >Z/2 we reject H0.
Conclusion: The data provides sufficient evidence to support thefact that mean recovery times are different at 3% level. p-value =2• P( Z > |Z-stat| ) = 2• P( Z > 5.5789 ) ˜0.
WHY IS IS ~ 0? I'M LOOKING AT THE Z TABLE AND AT 0, 0 IS THE ONLYTIME IT'S ZERO, MY TABLE ONLY GOES UP TO 3.4 AS IT INCREASES THEAREA GOES UP, HOW COME THE SOLUTION SAYS ITS ALMOST 0? SOMEONEEXPLAIN Why IS P VALUE ALMOST ZERO?
The length of time to recovery was recorded for patients randomlyassigned and subjected to two different surgical procedures. Thedata, recorded in days, are as follows.
ni X¯i si2
Procedure - I 31 7.3 1.23
Procedure – II 35 8.9 1.49
a. Do the data present sufficient evidence to indicate a differencein mean recovery
times for the two surgical procedures? Take ? = 0.03.
b. Find the p-value for the test..
Answer: X1 = Recovery time for a patient subjected to surgicalprocedure – I
X2 = Recovery time for a patient subjected to surgical procedure– II
1 = True average recovery time for a patient subjected tosurgical procedure – I
2 = True average recovery time for a patient subjected tosurgical procedure – II
H0 : 1 – 2 = 0 vs H1 : 1 – 2 0
For = 0.03 Z/2 = 2.17. As | z – stat | >Z/2 we reject H0.
Conclusion: The data provides sufficient evidence to support thefact that mean recovery times are different at 3% level. p-value =2• P( Z > |Z-stat| ) = 2• P( Z > 5.5789 ) ˜0.
WHY IS IS ~ 0? I'M LOOKING AT THE Z TABLE AND AT 0, 0 IS THE ONLYTIME IT'S ZERO, MY TABLE ONLY GOES UP TO 3.4 AS IT INCREASES THEAREA GOES UP, HOW COME THE SOLUTION SAYS ITS ALMOST 0? SOMEONEEXPLAIN
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