Ascientist wishes to estimate the mean breaking strength of a certain type of steel rod within 3.0 psi with 95% confidence. based on experience with a similar type of steel, she believes the standard deviation is approximately 15.0 psi in individual breaking strengths. how many steel rods should she test?

97 rods

Step-by-step explanation:

The number of steel rods for 95% confidence level

E=3

Substituting values

Thus 97 rods is tested

options a,b,c are the right answer.

step-by-step explanation:

a linear parent function is always represented as y = x

if we write this function in the form of y=mx+c

⇒

or  

now if we plot a graph we will find these characteristics:

1) y intercept of the graph is zero so its a straight line passing through origin.

2) as we can see in both the forms of function written, values of x and y may be either positive or negative for the positive slope means points on the graph are either in first quadrant or in third one.

3) it's slope is one.

the answer is d on edge

step-by-step explanation: