Ask Question, Ask an Expert

+1-415-315-9853

info@mywordsolution.com

Ask Statistics and Probability Expert

Paired Samples t test.

The stimulant Ritalin has been shown to increase attention span and progress academic performance in children with ADHD (Evans, Pelham, Smith, et al., 2001). To demonstrate the effectiveness of the drug, a researcher selects a sample of n = 25 children diagnosed with the disorder and measure each child's attention span before and after taking the drug. The data show an average increase of attention span of M_D = 6.8 minutes with a standard deviation of s = 5.5.
a. Is this result sufficient to conclude that Ritalin has a significant effect on attention span? Use a two-tailed test with ∝ = .01.
b. find out r^2 and estimate Cohen's d to measure the effect size of the drug.

Statistics and Probability, Statistics

  • Category:- Statistics and Probability
  • Reference No.:- M921885

Have any Question? 


Related Questions in Statistics and Probability

Discuss how a human rights approach may aid or obstruct the

Discuss how a Human Rights Approach may aid or obstruct the resolution of these three themes: 1. Poverty 2. The Syrian Refugee crisis 3. The death penalty For each theme, please make sure you discuss the human rights iss ...

Resource reservation protocol rsvp was originally designed

Resource Reservation Protocol (RSVP) was originally designed to establish signaling links for stationary networks. RSVP was applied to mobile wireless technology. A simulation study revealed that the transmission delay ( ...

1 what is an interaction2 how many interactions can be

1. What is an interaction? 2. How many interactions can be tested in a 2 x 2 design? In a 3 x 3 design? In a 2 x 2 x 3 design? 3. Why do researchers use expericorr designs?

A researcher obtained a sample of 180 participants between

A researcher obtained a sample of 180 participants between the ages of 18 and 24 and calculated the phi coefficient between whether they smoked cigarettes and whether they used marijuana (yes vs. no). Because the correla ...

1 why must researchers ensure that their experimental

1. Why must researchers ensure that their experimental groups are roughly equivalent before manipulating the independent variable? 2. Discuss the relative advantages and disadvantages between within-subjects designs and ...

Data show that narcissistic people who have a grandiose

Data show that narcissistic people (who have a grandiose, inflated perception of themselves) often fly into a "narcissistic rage" when things don't go their way. (In other words, they throw a temper tantrum.) A resea ...

Exam - probability and stochastic modelspart a -q1 twelve

Exam - Probability and Stochastic models Part A - Q1. Twelve recruits were subjected to a selection test to ascertain their suitability for a certain course of training. At the end of training there were given a proficie ...

The time spentin days waiting for a kidney transplant for

The time spent(in days) waiting for a kidney transplant for people ages 35-49 can be approximated by the normal distribution, as shown in the figure to the right. (a) What waiting time represents the 99th percentile? (b) ...

According to a study conducted by dell computers 65 of men

According to a study conducted by Dell Computers, 65% of men and 70% of women say that weight is a very important factor in purchasing a laptop computer. Suppose this survey was conducted using 374 men and 481 women. Do ...

1 draw a negatively skewed distribution2 what does it

1. Draw a negatively skewed distribution. 2. What does it indicate if a participant has a z-score of 2.5? -.80? .OO?

  • 4,153,160 Questions Asked
  • 13,132 Experts
  • 2,558,936 Questions Answered

Ask Experts for help!!

Looking for Assignment Help?

Start excelling in your Courses, Get help with Assignment

Write us your full requirement for evaluation and you will receive response within 20 minutes turnaround time.

Ask Now Help with Problems, Get a Best Answer

WalMart Identification of theory and critical discussion

Drawing on the prescribed text and/or relevant academic literature, produce a paper which discusses the nature of group

Section onea in an atwood machine suppose two objects of

SECTION ONE (a) In an Atwood Machine, suppose two objects of unequal mass are hung vertically over a frictionless

Part 1you work in hr for a company that operates a factory

Part 1: You work in HR for a company that operates a factory manufacturing fiberglass. There are several hundred empl

Details on advanced accounting paperthis paper is intended

DETAILS ON ADVANCED ACCOUNTING PAPER This paper is intended for students to apply the theoretical knowledge around ac

Create a provider database and related reports and queries

Create a provider database and related reports and queries to capture contact information for potential PC component pro