Researchers hate noted a decline in cognitive functioning as people age (Bartus, 1990), However, the results from other research suggest that the antioxidants in foods such as blueberries can reduce and even reverse these age-related declines, at least in laboratory rats (Joseph et al., 1999). Based on these results, one might theorize that the same antioxidants might also benefit elderly humans. Suppose a researcher is interested in testing this theory. The researcher obtains a sample of n = 16 adults who are older than 65, and gives each participant a daily dose of a blueberry supplement that is very high in antioxidants. After taking the supplement for 6 months, the participants are given a standardized cognitive skills test and produce a mean score of M = 50.2. For the general population of elderly adults, scores on the test average = 45 and form a normal distribution with = 9.
a. Can the researcher conclude that the supplement has a significant effect on cognitive skill ? Use a two-tailed test with = .05.
b. Compute Cohen's d for this study.
c. Write a .sentence demonstrating how the outcome of the hypothesis test and the measure of effect size would appear in a research report.
The value of , , , and .
The null hypothesis states that there the supplement had no significant effect on cognitive skills.
The alternative hypothesis states that the supplement had significant effect.
With the critical region comes with critical boundaries as
To write: A sentence demonstrating how the outcome of the hypothesis test and measure of effect size would appear in a research report.
Bartleby provides explanations to thousands of textbook problems written by our experts, many with advanced degrees!Get Started
Statistics for The Behavioral Sciences (MindTap Course List)
Essentials of Statistics for The Behavioral Sciences (MindTap Course List)
Probability and Statistics for Engineering and the Sciences
Essentials Of Statistics
Understanding Basic Statistics
Single Variable Calculus: Early Transcendentals
Finite Mathematics and Applied Calculus (MindTap Course List)
Single Variable Calculus
Elements Of Modern Algebra
Calculus of a Single Variable
Trigonometry (MindTap Course List)
Mathematical Excursions (MindTap Course List)
Contemporary Mathematics for Business & Consumers
Calculus: An Applied Approach (MindTap Course List)
Calculus: Early Transcendental Functions
Precalculus: Mathematics for Calculus (Standalone Book)
Elementary Technical Mathematics
Calculus: Early Transcendentals
Calculus (MindTap Course List)
Mathematical Applications for the Management, Life, and Social Sciences
Elementary Geometry For College Students, 7e
Single Variable Calculus: Early Transcendentals, Volume I
Applied Calculus for the Managerial, Life, and Social Sciences: A Brief Approach
Finite Mathematics for the Managerial, Life, and Social Sciences
Calculus: Early Transcendental Functions (MindTap Course List)
Introduction To Statistics And Data Analysis
Study Guide for Stewart's Single Variable Calculus: Early Transcendentals, 8th
Elementary Geometry for College Students
Study Guide for Stewart's Multivariable Calculus, 8th