24.22 Caffeine and sugar. A double-blindrandomized experiment assigned healthy undergraduatestudents to drink one of four beverages after fastingovernight: water, water with 75 mg of caffeine, waterwith 75 g of glucose, and water with 75 mg of caffeineand 75 g of glucose. Subjects performed a number ofcognitive tasks, including the California ComputerizedAssessment Package, a computerized reaction timeprogram measuring sustained attention, reaction time,and visual scanning speed. Here are the resultingreaction times (SEM is the standard error of themean):SEMBeverage18 389.35 18.50Water18 320.16 17.98Water and caffeineWater and glucose18 318.16 17.04Water, caffeine, and glucose 18 336.44 14.02Identify the populations and the response variable. Statethe null and alternative hypotheses of the correspondingANOVA F test and specify its degrees of freedom.IX (c) The population mean load failure is lowest for the15-second condition and highest for the 60-secondcondition.ricalhANOVA test is that

Given information: The data represents the descriptive statistics for four types of beverages.

Answered: Caffeine and sugar. A double-blind…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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To examine the effect of relaxing music on math test performance, a researcher wants to compare the average math test scores of participants who completed the test with relaxing music to performance of participants who completed the same math test without music. The partially computed data collected in the study are shown below: Math Test with Music: Math Test without Music: n1 = 16 n2 = 12 M1 = 82 M2 = 78 SS1 = 150 SS2 = 140 Based on these results, is there a significant effect of relaxing music on math test performance? Use a t-test for independent samples with p < .01, 2-tails to answer this research question. Follow the steps of hypothesis testing and insert your answers below. In your calculations, round all numbers to two decimal places to avoid rounding errors. ANSWER H0: H1: Computed pooled variance sp2: Estimated standard SM1 - M2: Computed t: Critical t-value for…
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S-adenosyl methionine (SAM-e) is a naturally occurring compound in human cells that is thought to have an effect on depression symptoms. Suppose that a researcher is interested in testing SAM-e on patients who are struggling with cancer. She obtains a sample of n = 20 patients and asks each person to take the suggested dosage each day for 4 weeks. At the end of the 4-week period, each individual takes the Beck Depression Inventory (BDI), which is a 21-item, multiple-choice self-report inventory for measuring the severity of depression. The scores from the sample produced a mean of M = 24.4 with a standard deviation of s = 6.02. In the general population of cancer patients, the standardized test is known to have a population mean of 27.2. Because there are no previous studies using SAM-e with this population, the researcher doesn't know how it will affect these patients; therefore, she uses a two-tailed single-sample t test to test the hypothesis. From the following, select the correct…
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