In a random sample of 50 specimens, the average porosity (in percent) was 21 and the standard deviation σ = 3. how many specimens must be sampled so that a 95% confidence interval specifies the mean to within equation .6?

There is a line with slope 1/a going through the point (a, a²). find the equation of the line perpendicular to this line at this point. (don’t let this problem intimidate you! solve the problem as you would if i’d given you specific values. just use variables instead.)

Use the graph of the sine function y=2sinθ shown below

Read the situations in the table below. then drag a graph and equation to represent each situation. indicate whether each of the relationships is proportional or non-proportional. edit : i got the right answer its attached