This topic contains a solution. Click here to go to the answer
« previous next »

Author Question: An experiment is conducted with two groups of college students. The 25 students in the treatment ... (Read 59 times)

penguins

  • Hero Member
  • *****
  • Posts: 903
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


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

yuyiding

  • Sr. Member
  • ****
  • Posts: 357
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

  • Member
  • Posts: 903
Reply 2 on: Jul 24, 2018
Excellent

jackie

  • Member
  • Posts: 324
Reply 3 on: Yesterday
Wow, this really help

« previous next »
 

Did you know?

Each year in the United States, there are approximately six million pregnancies. This means that at any one time, about 4% of women in the United States are pregnant.

Did you know?

All patients with hyperparathyroidism will develop osteoporosis. The parathyroid glands maintain blood calcium within the normal range. All patients with this disease will continue to lose calcium from their bones every day, and there is no way to prevent the development of osteoporosis as a result.

Did you know?

There are immediate benefits of chiropractic adjustments that are visible via magnetic resonance imaging (MRI). It shows that spinal manipulation therapy is effective in decreasing pain and increasing the gaps between the vertebrae, reducing pressure that leads to pain.

Did you know?

There are 20 feet of blood vessels in each square inch of human skin.

Did you know?

In 1864, the first barbiturate (barbituric acid) was synthesized.

The Racker and Stoeckenius experiment showing that an H+ electrochemical gradient drives ATP synthes The Racker and Stoeckenius experiment showing that an H+ electrochemical gradient drives ATP synthes
A Schematic Description of the Experiment by Maviel et al. (2004) A Schematic Description of the Experiment by Maviel et al. (2004)
Reference Groups Reference Groups
Basic Design of the Driving and Cell Phone Distraction Experiment Basic Design of the Driving and Cell Phone Distraction Experiment
Two lymphocytes that are reactive in a 19-year-old college student with infectious mononucleosis. ... Two lymphocytes that are reactive in a 19-year-old college student with infectious mononucleosis. ...
A Tough Economy ...for students A Tough Economy ...for students
Video: Neuron Structure Animation

For a complete list of videos, visit our video library