Given are five observations for two variables, and y. Use Table 2 of Appendix B. Ti 1 Yi 4 Round your answers to two decimal places. a. Using the following equation: 1 S₁ = 8 + n Σ(x₁ - x)² D Estimate the standard deviation of * when z = 4. b. Using the following expression: ŷ* ±ta/28* Develop a 95% confidence interval for the expected value of y when z = 4. to c. Using the following equation: 1 8pred=8 1+ + 72 Σ(x - 7) Estimate the standard deviation of an individual value of y when z-4. d. Using the following expression: ŷto/2 pred Develop a 95% prediction interval for y when a to 2 7 345 5 11 13

answer 3

Please use the following information to answer question 9a & 9b: A random sample of n = 16 scores is obtained from a population with a mean of µ = 45. After a treatment is administered to the individuals in the sample, the sample mean is found to be x̅ = 49.2. 9a. Assuming that the sample standard deviation is s = 20, calculate r2 (MUST SHOW WORK FOR THIS PROBLEM). Note: You must provide calculations for the t-statistic, in addition to r2.       9b. Calculate Cohen's d to measure the size of the treatment effect (MUST SHOW WORK FOR THIS PROBLEM).       Comparing your answers from 8 (a&b) and 9 (a&b), fill in the blank to properly describe how the variability of scores in the sample influence the measures of effect size. (8. A random sample of n = 16 scores is obtained from a population with a mean of µ = 45. After a treatment is administered to the individuals in the sample, the sample mean is found to be x̅ = 49.2. 9. A random sample of n = 16 scores is obtained from a…

4:40 Amylab.pearson.com Identify the symbols used for each of the following: (a) sample standard deviation; (b) population standard deviation; (c) sample variance; (d) population variance. If sample data consist of weights measured in grams, what units are used for these statistics and parameters? a. The symbol for sample standard deviation is b. The symbol for population standard deviation is c. The symbol for sample variance is d. The symbol for population variance is

Ee.79. Suppose that a car races down a ¼-mile drag strip several times and that it takes an average of 11.4 s to do so. If the standard deviation is σ=0.2 s, what fraction (or percent) of the measurements would you expect to be between 11.3 s and 11.5 s?

A sample of 126 was found to have a standard deviation of 5.9. An interval estimate for ?μ based on the sample was (27.576, 29.464). What is the margin of error from this estimate? What was the ??,?tν,α that was used to get this interval extimate?

Use calculator t3 .