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Author Question: An experiment is conducted with two groups of college students. The 25 students in the treatment ... (Read 139 times)

penguins

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on: Jul 24, 2018
An experiment is conducted with two groups of college students. The 25 students in the treatment group scored an average of 3.7 with a standard deviation of 0.8 . The 18 students in the placebo group scored an average of 3.3 with a standard deviation of 1.0 . Compare the degrees of freedom from Welch's approximation with the conservative by-hand estimate for the degrees of freedom.

Question 2

Suppose that 20 of a random sample of n = 64 men are currently single. What is the standard error of the proportion of single men in the sample?
 a. 0.125
  b. 0.05
  c. 0.10
  d. 0.20


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yuyiding

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Reply #1 on: Jul 24, 2018
Answer to Question 1

Conservative estimate: df = 17; Welch's approximation: df = 31.5

Answer to Question 2

B


penguins

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Reply 2 on: Jul 24, 2018
Gracias!

aliotak

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Reply 3 on: Yesterday
Wow, this really help

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