Define the term standard deviation. Why is it important to know the standar

Jun 26th, 2015
Sigchi4life
Category:
Psychology
Price: $30 USD

Question description

  1. Define the term standard deviation. Why is it important to know the standard deviation for a given sample? What do researchers learn about a normal distribution from knowledge of the standard deviation? A sample of n=20 has a mean of M = 40. If the standard deviation is s=5, would a score of X= 55 be considered an extreme value? Why or why not?
  2. Hypothesis testing allows researchers to use sample data, taken from a larger population, to draw inferences (i.e., conclusions) about the population from which the sample came. Hypothesis testing is one of the most commonly used inferential procedures. Define and thoroughly explain the terms null hypothesis and alternative hypothesis. How are they used in hypothesis testing?
  3. Define the term standard error. Why is the standard error important in research using sample distributions? Consider the following scenario: A random sample obtained from a population has a mean of µ=100 and a standard deviation of σ = 20. The error between the sample mean and the population mean for a sample of n = 16 is 5 points and the error between a sample men and population mean for a sample of n = 100 is 2 points. Explain the difference in the standard error for the two samples.


Tutor Answer

(Top Tutor) Daniel C.
(997)
School: Duke University
PREMIUM TUTOR

Studypool has helped 1,244,100 students

8 Reviews


Summary
Quality
Communication
On Time
Value
darnay
Dec 4th, 2016
" The best tutor out there!!!! "
dontuwannaknow
Nov 25th, 2016
" Excellent work as always thanks so much "
SjSurvivor143
Nov 12th, 2016
" Thanks for the help. "
ddg82
Nov 3rd, 2016
" Thanks, good work "
tinytim47
Oct 20th, 2016
" Wow this is really good.... didn't expect it. Sweet!!!! "
jestin7
Oct 11th, 2016
" This tutor is great! "
mixedballz
Oct 7th, 2016
" excellent work as always thanks for the help "
lilmoe415
Sep 28th, 2016
" Thank you, Thank you, for top quality work, this is your guy!! "
Ask your homework questions. Receive quality answers!

Type your question here (or upload an image)

1827 tutors are online

Brown University





1271 Tutors

California Institute of Technology




2131 Tutors

Carnegie Mellon University




982 Tutors

Columbia University





1256 Tutors

Dartmouth University





2113 Tutors

Emory University





2279 Tutors

Harvard University





599 Tutors

Massachusetts Institute of Technology



2319 Tutors

New York University





1645 Tutors

Notre Dam University





1911 Tutors

Oklahoma University





2122 Tutors

Pennsylvania State University





932 Tutors

Princeton University





1211 Tutors

Stanford University





983 Tutors

University of California





1282 Tutors

Oxford University





123 Tutors

Yale University





2325 Tutors