The amount of certain trace element in blood is known to vary with a standard deviation of 24.1 ppm (parts per million) for male blood donors and 19.5 ppm foe female donors. Random sample of 85 male and 60 female donors yield concentration means of 28 and 33 ppm respectively. What is the likelihood that the population means of concentrations of the element are significant for men and women?

When graphing a linear equation that is written in the form y=mx+b, the variable m represents the y-intercept. assuming that b> 0, which of the following best describes how reversing the sign of b would affect the graph? a) the new line will be shifted down b units b) the new line will be shifted down b x 2 units c) the new line will be a perfect reflection across the x-axis d) the new line will be a perfect reflection across the y-axis

The measure of the angles supplement is 30 more than four times that of its complement. find the measure of the angle described

In a cooking context, which of the following materials is the best heat conducter?