A researcher plans to conduct a research study comparing two treatment conditions with a total of 20 scores in each treatment. Which of the following designs would require only 20 participants? a. independent-samples design b. matched-subjects design c. between-subjects design d. within-subjects design

A researcher plans to conduct a research study comparing two treatment conditions with a total of 20 scores in each treatment. Which of the following designs would require only 20 participants? a. independent-samples design b. matched-subjects design c. between-subjects design d. within-subjects design

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

See similar textbooks

Similar questions

A researcher is testing the effect of one independent variable using three treatment conditions. She compares three group means where there are different people in each group. It is best for her to use which type of statistical analysis?
Give 5 examples of situations using this: 1. Retrospective Study 2. Observational Study 3. Designed Experiment
A researcher conducts an experiment comparing two treatment conditions with 10 scores in each treatment condition. If an independent-measures design is used, how many participants are needed for the study? If a repeated-measures design is used, how many participants are needed for the study? If a matched-subjects design is used, how many participants are needed for the study?
Which method II? Which of the following scenariosshould be analyzed as paired data?a) Spouses are asked about the number of hours of sleepthey get each night. We want to see if husbands getmore sleep than wives.b) 50 insomnia patients are given a placebo and 50 aregiven a mild sedative. Which subjects sleep more hours?c) A group of college freshmen and a group of sophomoresare asked about the quality of the university cafeteria. Dostudents’ opinions change during their time at school?
Suppose you work as a manager for a large clothing store. You are considering introducing a loyalty program to encourage customers to spend more at your store. Before rolling out your program to the public, you want to do a small experiment to estimate its effectiveness. You offer the loyalty program to 10 random customers, and also observed the sales of 27 random customers who did not get the program as a control group. The customers that were part of the loyalty program had average monthly sales of $302.57 and a sample standard deviation of $49.73. For the control group, the customers had an average monthly sales of $231.65 and a sample standard deviation of $67.88. * Given a 95% confidence interval critical value of t = 2.04, what is the upper bound (upper end) of a 95% confidence interval for the difference between two averages? Use (μloyalty program no loyalty program) for the order. Note: 1- Only round your final answer. Round your final answer to two decimal places.
7. While age is not considered to be a variable of interest, there is some concern that older people may react differently to the treatments than younger people. The best way to address this concern is to design the study to make use of: a. Blinding b. Randomization c. Blocking d. Replication
Rhino viruses typically cause common colds. In a test of the effectiveness of echinacea, 42 of the 48 subjects treated with echinacea developed rhinovirus infections. In a placebo group, 93 of the 109 subjects developed rhinovirus infections. Use a 0.01 significance level to test the claim that echinacea has an effect on rhinovirus infections. Complete parts (a) through (c) below.
1. Imagine you work for a psychological testing agency and you have been assigned the role of analysing the data. The experiment involves testing 4 different drugs in treating 20 asthma patients. They were each asked to take the 4 different drugs in 4 weeks and record how many attacks they had while taking each drug per week. a. Explain why this is a repeated measures design? b. Explain two reasons why this design is the best choice?
Consider a study where the objective is to determine whether the type of frame of a bicycle could affect your travel time to work. On each of 56 days from mid-January to mid-July 2010, Dr Jeremy Groves tossed a coin to decide whether he would ride the 27 miles to work on his carbon frame bicycle or on his steel frame bicycle. He collected the following data: Carbon frame: Sample size: 26 days Mean commute time: 108.34 minutes SD: 6.25 minutes Steel frame: Sample size: 30 days Mean commute time: 107.81 minutes SD: 4.89 minutes Suppose we use as sample statistic the difference in sample means (108.34 - 107.81). Find the lower limit of a theory-based 99% confidence interval. Round your answer to 3 decimal places.
Identify whether the studies described here are based on (1) single samples, (2) paired samples, or (3) independent samples. Cardiovascular disease risk factors are compared in husbands and wives. A nutritional exam is applied to a random sample of individuals. Results are compared to the results of the whole nation. An investigator compares vaccination histories in 30 autistic schoolchildren to a simple random sample of non-autistic children from the same school district.
For each scenario listed below, determine whether the scenario represents an Independent Samples or Dependent Samples (Matched Pairs) situation by placing the appropriate letter in the box provided. a. Comparing pre-test scores before training to post-test scores: OIndependent Samples OMatched Pairs b. Comparing the number of speeding tickets received by men to the number received by women: OIndependent Samples Matched Pairs c. Comparing pain levels of a group receiving a placebo to a group receiving a medicine: Independent Samples OMatched Pairs d. Comparing pain levels before and after treatment with magnetic therapy: Independent Samples OMatched Pairs
Why is a cohort design more efficient than a case-control design to study a rare exposure? (Select one best answer) Group of answer choices a. Subjects are selected based on their exposure status. b. Subjects are selected based on their disease status. c. Subjects are selected based on their exposure and disease status. d. Subjects are selected based on their random allocation to treatment or placebo. e. None of these.