Test Prep. A GRE prep company claims that average score improvement of their students is equal to 90 points. We want to see if it is different than this. We randomly sample students for their average improvement. The data we collected are below. GRE scores are known to be normally distributed. Points 90.4 84 77 75.2 81.5 78.4 96.5 97.3 101.5 85.3 69.5 88.6 92.4 Evaluate the company's claim using a hypothesis test. You wish to test the following claim (Ha) at a significance level of a = 0.05. (a) Write the hypothesis for the test. O Ho: H= 90 Ha: p = 90 O H;: H = 90 Ha: p< 90 O Ho: H = 90 Ha: p> 90 O Ho: H = 85.969 Ha: p = 85.969 Ο H : μ- 85. 969 H3: p < 85.969 Ο H : μ- 85. 969 H: p> 85.969 (b) What is the p-value for this test (round to 4 decimal place) (c) Based on the sample data, we sould conclude that ...

The increasing annual cost (including tuition, room, board, books and fees) to attend college) to attend college has been widely discussed in many public including Money magazine. The following random samples show the annual cost of attending private and public colleges. Data are in thousands of dollars. Click on the datafile logo to reference the data. Round degrees of freedom to the preceding whole number. DATA file Private Colleges 52.8 30.6 20.3 43.2 Public Colleges 45.8 22.8 22.0 25.8 45.0 33.3 37.8 50.5 28.2 15.6 18.5 44.0 25.6 42.0 a. Compute the sample mean and sample standard deviation for private and public colleges. Round your answers to two decimal places. F1 = 24.1 28.5 21.8 14.4 F2 = S₁ = S₂ b. What is the point estimate of the difference between the two population means? Round your answer to one decimal place. Interpret this value in terms of the annual cost of attending private and public colleges. $ c. Develop a 95% confidence interval of the difference between the…

The chart below represents the number of inches of snow for a seven-day period. Sunday Monday Tuesday Wednesday Thursday Friday Saturday 2 5 3 10 0 4 2 Find the mean, median, and mode. Which is the best measure of central tendency? Remove Wednesday from the calculations. How does that impact the three measures of central tendency? Describe the effect outliers have on the measures of central tendency.

Consider a data set with at least three data values. Suppose the highest value is increased by 10 and the lowest is decreased by 10. (a) Does the mean change? Explain. b) Does the median change? Explain. c) Is it possible for the mode to change? Explain

grade 12 data management.  question : What is the weighted average score for Larry?

Ungrouped data: 12, 34, 28, 26, 32, 28, 40, 36 What percentage of values is below the mean? What is the difference between the median and the range?