Question

As part of a study of driver safety, an investigator wants to know the effect of blood-alcohol level on the length of time it takes for a driver's foot to reach the brake pedal following the sudden appearance of an object 50 meters in front of the car. Using a simulator that mimics this driving condition, the investigator measures this reaction time (in seconds) for volunteers under five different conditions: after consuming either 0, 0.5, 1.0, 1.5, 2.0, or 2.5 ounces of alcohol, administered as pure (tasteless) alcohol mixed with orange juice so that, apart from the effects of the alcohol, the volunteers are unaware of which condition they are in. What statistical analysis would you use?

Group of answer choices:

t-test

Regression

Correlation

ANOVA

Answer 1

Sol:

t-test used for comparing only 2 groups

Regression used to estimate y based on x

correlation used to check whether relationship exists or not

ANOVA used to compare whether more than 3 group means are different or not.

we can also two way ANOVA whether interaction exists

here 5 groups( 0, 0.5, 1.0, 1.5, 2.0, or 2.5 )

ANSWER:

ANOVA