In a 21 element sample, the sample mean is equal tox-bar=10; the standard error of the mean is equal to 5. if the two-tailed combined proportions for the 90% confidence interval for the true mean is either t0.10,20 = 1.725 or t0.05,20 = 2.086, what are the limits of the confidence interval?

Which of the following represents a number squared is equal to twenty more than nine times that number ? a) x squared = 9x + 20 b) x squared = 20x + 9 c) x squared > 9 + 20x d) x squared = 9 + x + 20

One month, a music site observed that 60% of the people who downloaded songs from its site downloaded q sam's latest single. the equation below represents this information, where x represents the total number of people who ddownloaded songs from the site that month: x = 0.6x + 384 how many people who downloaded songs from the site that month downloaded q sam's latest single?

Evaluate the discriminant of each equation. tell how many solutions each equation has and whether the solutions are real or imaginary. x^2 - 4x - 5 = 0