4. A population has a standard deviation of o = a. On average, how much difference should exist be- tween the population mean and the sample mean for n = 4 scores randomly selected from the population? b. On average, how much difference should exist for a sample of n = 9 scores? = 24. %3D |3D a sample of n = 16 scores? c. On average, how much difference should exist for %3D

In one of the Stat 2 sections, the students in the section have an average height of 64 inches, with a standard deviation of 3 inches. The GSI happens to be 68 inches. Express the height of the GSI in standard units, relative to the students in the section. Choose the answer below that is closest. Group of answer choices 1.67 3.0 1.5 1.33 4.0      PreviousNext

Ch 8 FRQ ( The distribution of average speeds of the top 53 drivers in NASCAR is roughly symmetric, unimodal, and bell-shaped, with a mean of 184.8 mph and a standard deviation of 7.2 mph. In the space above, draw a Normal Curve, from z=-3 to z=+3. Draw vertical lines at the mean and each whole number standard deviation above and below the mean. Write two rows of numbers under the base line; one row with the number of standard deviations above and below the mean (z-scores), and a row under that with the actual values for this problem. ] What percent of drivers would you expect to have speeds below 199.2 mph ? Show all work. s] What is the area under the curve to the left of a speed of 170.4mph Show all work. What is the probability that a driver selected at random will have a speed below 172.0 mph ? Show all work. B] What percent of drivers would you expect to have a speed above 177.0 mph ? Show all work. How many drivers would you expect to have speeds between 170.4 mph and 177.0 mph…

Suppose that 50 measurements were taken and the mean was calculated to be 4.55. Assume next that one of the data items was 19.4This was assumed to be an outlier as was discarded. What would be the mean of the remaining 49 numbers? I

Calculate the mean, variance, and standard deviation of 5 students exam scores, from a Statistics course with a total of 25 students: 99,72,89,62, and 66. Round to two decimal places as needed Click this video to learn more about the formula 99 72 89 62 66 X xx 2 (x − x)² Mean Variance Standard Deviation

3. Complete the first 3 columns of the table below. Values Deviations Square deviations X X - X (X-X)² Standard (z) scores X-X Z = a. Compute the sample variance and sample standard deviation by definition. b. Fill in the last column of the table c. Compute the coefficient of variation.

80 84 94 65 72 55 84 99 86 87 For this population answer the following 6 questions. 1. Find U=. 2. Find O - %3D 3. Find the standard deviation = 4. Find the Z-score of 75. 5. How many standard deviations from the mean is the score of 62? 6. What score represents a Z-score of -2 for this popuiation? shows thos ve