A Researcher Performs a Hypothesis Test to Test the Claim $\mathrm { H } _ { 0 }$

A researcher performs a hypothesis test to test the claim that for a particular breed of dog,the mean weight of an adult dog is less than 18 kg.Use the given computer output to draw a conclusion about the mean adult dog weight for this breed at a significance level of 0.05. Test of $\mathrm { H } _ { 0 }$ : ? = 18 vs $\mathrm { H } _ { \mathrm { A } }$ : ? < 18
N Mean StDev t P-value
21 17.883 0.212 -2.53 0.01

A) Fail to reject the null - there is strong evidence that the mean weight is less than 18 kg.
B) Reject the null - there is strong evidence that the mean weight is 18 kg.
C) Reject the null - there is strong evidence that the mean weight is less than 18 kg.
D) Fail to reject the null - there is strong evidence that the mean weight is 18 kg.
E) There is insufficient information to draw a conclusion.

Correct Answer:

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