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Basic Question 2 of 9

The times for untrained rats to run a standard maze has an N(65, 15) distribution where the times are measured in seconds. The researchers hope to show that training improves the times, and they will do so by testing statistical hypotheses. The appropriate alternative hypothesis is ______.

A. Ha:μ > 65
B. Ha:x-bar > 65
C. Ha:μ < 65
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User Contributed Comments 9

User Comment
danlan Alternative hypothesis is what's needed to show and null hypothesis is what's needed to be rejected.
johnowens We want to show that training improves times.

Ha: the times are faster
gill15 Stupid. I was thinking cardio --- and longer they run was what they were testing....just stupid
sgossett86 we have different ways of looking at this.

what i see is that someone indicated the null will always be greater or less than or equal to some value. here we see that the docs are trying to prove time is improved. therefore it will be <65 they want to prove. However because the null carries the equal sign, the alternative will be the <65.
Shaan23 Gill...rats working on cardio...thats fantastic
schweitzdm what does N(65,15) mean?
Rachelle3 THE OTHER TWO ANSWERS GO OVER 65
> 65 = MORE THAN 65
FROM THERE YOU KNOW WHAT TO CHOOSE!
ashish100 ^ why are you yelling?
but thanks.
shalie This hipothesis is one tailed. H0< 65.
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I passed! I did not get a chance to tell you before the exam - but your site was excellent. I will definitely take it next year for Level II.
Tamara Schultz

Tamara Schultz

Learning Outcome Statements

explain hypothesis testing and its components, including statistical significance, Type I and Type II errors, and the power of a test

CFA® 2025 Level I Curriculum, Volume 1, Module 8.