Please use the following information to answer question 2: A sample of n = 25 scores has a mean of x̅ = 83 and a standard deviation of s = 15. 2. Compute the estimated standard error for the sample mean (MUST SHOW WORK FOR
Please use the following information to answer question 2:
A sample of n = 25 scores has a mean of x̅ = 83 and a standard deviation of s = 15.
2. Compute the estimated standard error for the sample mean (MUST SHOW WORK FOR THIS PROBLEM).
Please use the following information to answer questions 4a-4b:
To evaluate the effect of a treatment, a sample of n = 8 is obtained from a population with a mean of µ = 40, and the treatment is administered to the individuals in the sample. After treatment, the sample mean is found to be x̅ = 35.
If the sample variance is s2 = 32, are the data sufficient to conclude that the treatment has a significant effect? Use a two-tailed test with α = .05.
4a. Which of the following correctly represents the null and alternative hypothesis for the mentioned sample of n = 8 (MUST SHOW WORK FOR THIS PROBLEM)?
a. Ho: µ = 40, H1: µ ≠ 40
b. Ho: µ ≥ 40, H1: µ < 40
c. Ho: µ > 40, H1: µ ≤ 40
d. Ho: µ ≤ 40, H1: µ > 40
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