Case study lesson

The center section of Interstate -35W (a)   in north Minneapolis , Minnesota suddenly gave way on 8/1/07.

The failure of the bridge was not a surprise because the design and (a)   processes that bridges undergo are supposed to ensure that bridge failures do not happen.

In order for investigators to determine why the bridge failed they needed to use many parts of

(a)  

A type of scientific investigation that test how one factor affects another is called an

(a)  

any factor in an experiment that can have more than one value is called a

(a)  

a factor un an experiment that is manipulated or changed by the investigator is called an

(a)  

the factor a scientist observes or measures during an experiment

(a)  

all the factors in an experiment that do not change

(a)  

data that use words to describe what is observed in an experiment

(a)  

the part of a controlled experiment used to study relationships among variables

(a)