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 142 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
Thanks for the timely response, appreciate it

ryhom

  • Member
  • Posts: 366
Reply 3 on: Yesterday
:D TYSM

« previous next »
 

Did you know?

When Gabriel Fahrenheit invented the first mercury thermometer, he called "zero degrees" the lowest temperature he was able to attain with a mixture of ice and salt. For the upper point of his scale, he used 96°, which he measured as normal human body temperature (we know it to be 98.6° today because of more accurate thermometers).

Did you know?

According to the American College of Allergy, Asthma & Immunology, more than 50 million Americans have some kind of food allergy. Food allergies affect between 4 and 6% of children, and 4% of adults, according to the CDC. The most common food allergies include shellfish, peanuts, walnuts, fish, eggs, milk, and soy.

Did you know?

The first monoclonal antibodies were made exclusively from mouse cells. Some are now fully human, which means they are likely to be safer and may be more effective than older monoclonal antibodies.

Did you know?

Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.

Did you know?

Atropine was named after the Greek goddess Atropos, the oldest and ugliest of the three sisters known as the Fates, who controlled the destiny of men.

An electron micrograph from an experiment demonstrating the function of a tight junction An electron micrograph from an experiment demonstrating the function of a tight junction
IgG after treatment with pepsin. IgG after treatment with pepsin.
Drugs Used in the Treatment of Migraine Drugs Used in the Treatment of Migraine
Differential metabolic profile from livers of control mice and livers from mice 2 h after treatment ... Differential metabolic profile from livers of control mice and livers from mice 2 h after treatment ...
Phantom Limb Treatment Phantom Limb Treatment
The Impact of Cross-Ethnic Friendships on Minority Students’ Well-Being The Impact of Cross-Ethnic Friendships on Minority Students’ Well-Being
Video: Cardiac conductile cells

For a complete list of videos, visit our video library