7.2 a population has a mean of ? = 80 and a standard deviation of ? = 10.
a. if you select a random sample of n = 4 scores from this population, how much error would you expect between the sample mean and the population mean?
b. if you select a random sample of n = 25 scores from this population, how much error would you expect between the sample mean and the population mean?
c. how much error would you expect for a sample of n = 100 scores?

Complete the solution of the equation. find the value of y when x equals -5. -4x - 8y = -52

Does the function satisfy the hypotheses of the mean value theorem on the given interval? f(x) = 4x^2 + 3x + 4, [−1, 1] no, f is continuous on [−1, 1] but not differentiable on (−1, 1). no, f is not continuous on [−1, 1]. yes, f is continuous on [−1, 1] and differentiable on (−1, 1) since polynomials are continuous and differentiable on . there is not enough information to verify if this function satisfies the mean value theorem. yes, it does not matter if f is continuous or differentiable; every function satisfies the mean value theorem.

Dots sells a total of 279 t-shirts ($2) and shorts ($4). in april total sales were $670. how many t-shirts and shorts did dots sell?