"Does ginkgo improve memory?" The law allows marketers of herbs and other natural substancesto make health claims that are not supported by evidence. Brands of ginkgo extract claim to "improve memoryand concentration." A randomized experiment found some statistically significant evidence for such effects.The subjects were 250 healthy volunteers over 65 years old. They were randomly assigned to take ginkgo or aplacebo pill (a dummy pill that looks and tastes the same). All the subjects took a battery of tests for learningand memory before treatment started and again after six weeks.a). The article said the study was double-blind. What does this mean in the context of this study? Be veryspecific on who's being blinded and explain why they should be blinded.b). You suspect physical fitness and mental fitness go hand-in-hand. Create a flow chart to describe a designfor an experiment to include the confounding variable physical fitness. Be very specific in your design.Include all details such as: Will blocking be used? If yes, who ill be in each block? When will you performrandom assignment? etc.

Cause and effect: The relationship between events where one results in the other. The outcome of…

Answered: "Does ginkgo improve memory?" The law…

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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Exercise is known to produce positive psychological effects. Interestingly, not all exercise is equally effective. It turns out that exercising in a natural environment (e.g., jogging in the woods) produces better psychological outcomes than exercising in urban environments or in homes (Mackay & Neill, 2010). Suppose that a sports psychologist is interested in testing whether there is a difference between exercise in nature and exercise in the lab with respect to post-exercise anxiety levels. The researcher recruits n 5 7 participants who exercise in the lab and exercise on a nature trail. The data below represent the anxiety scores that were measured after each exercise session. Treat the data as if the scores are from an independent-measures study using two separate samples, each with n 5 7 participants. Compute the pooled variance, the estimated standard error for the mean difference, and the independent-measures t statistic. Using a 5 .05, is there a significant difference…
Researchers investigate how the presence of cell phones influence the quality of human interaction. Subjects are randomly selected from a population and divided into an experimental group that is asked to leave their phones in the front of the room and a control group that are not asked to leave their cell phones at the front of the room. Subjects are left alone for 10 minutes and then asked to take a survey designed to measure quality of interactions they had with others in the experiment. What statistical test is appropriate?
How many subjects in the "patch only" group would you expect not to quit
Cell Phones and Crashes: Analyzing Newspaper Report In an article from the Associated Press, it was reported that researchers “randomly selected 100 New York motorists who had been in an accident and 100 who had not been in an accident. Of those in accidents, 13.7 percent owned a cellular phone, while just 10.6 percent of the accident-free drivers had a phone in the car.” What is wrong with these results?
Q1. Please answer fill-ins.
USA Today posted this question on the electronic version of its newspaper: “Should guys pay for their first date?” Of the 1148 subjects who decided to respond, 85% of them said “yes.” (a) Determine whether the study is an experimental or an observational study.
A manufacturer of pens has hired an advertising agency to develop an advertising campaign for the upcoming holiday season. To prepare for this project, the research director decides to initiate a study of the effect of advertising on product perception. An experiment is designed to compare three different advertisements. Advertisement A greatly undersells the pen's characteristics. Advertisement B slightly undersells the pen's characteristics. Advertisement C slightly oversells the pen's characteristics. A sample of 18 adult respondents, taken from a larger focus group, is randomly assigned to the three advertisements (so that there are 6 respondents to each advertisement). After reading the advertisement and developing a sense of "product expectation," all respondents unknowingly receive the same pen to evaluate. The respondents are permitted to test the pen and the plausibility of the advertising copy. The respondents are then asked to rate the pen from 1 to 7 (lowest to highest) on…
Fewer young people are driving. In 1995, 63.9% of people under 20 years old who were eligible had a driver's license. Bloomberg reported that percentage had dropped to 41.7% in 2016. Suppose these results are based on a random sample of 1,200 people under 20 years old who were eligible to have a driver's license in 1995 and again in 2016.
Amusia is a congenital disorder that adversely impacts one's perception of music. A study examined the pitch memory of individuals diagnosed with amusia. Each in a sample of 20 amusiacs listened to a series of tone pairs and was asked to determine if the tones were the same or different. In the first trial, the tones were separated by 1 second; in a second trial, the tones were separated by 5 seconds. The difference in accuracy scores for the two trials was determined for each amusiac (where the difference in the score on the first trial minus the score on the second trial). The mean score was 0.14 with a standard deviation of 0.18. Complete parts a through b below. a. In theory, the longer the delay between tones, the less likely one is to detect a difference between the tones. Consequently, the true mean score difference should exceed 0. Set up the null and alternative hypotheses for testing the theory. O A. Ho: H 0 H,i u= 0 O B. Ho: µ=0 OC. Ho: H=0 H,: u0 b. Carry out the test, part…
Homechooling has become very popular in the United States, and many colleges try to attract students from this group. Evidence suggests that approximately 90% of all homeschooled children attend college. To check this claim, a random sample of 208 homeschooled children was obtained, and 180 of them were found to have attended college. The researcher wishes to determine whether the proportion of homeschool children who attend college is different from 0.90. Test an appropriate hypothesis and state your conclusion. Make sure to state and check all conditions and state your conclusion in context.
Quit Smoking: The New England Journal of Medicine published the results of a double-blind, placebo-controlled experiment to study the effect of nicotine patches and the antidepressant bupropion on quitting smoking. The target for quitting smoking was the 8th day of the experiment. In this experiment researchers randomly assigned smokers to treatments. The following is an excerpt from this same study. “ A total of 311 subjects (34.8 percent) discontinued one or both medications. Seventy-nine subjects stopped treatment because of adverse events: 6 in the placebo group (3.8 percent), 16 in the nicotine-patch group (6.6 percent), 29 in the bupropion group (11.9 percent), and 28 in the combined treatment group (11.4 percent). The most common adverse events were insomnia and headache.” Recall that 160 smokers took the placebo and 244 smokers used nicotine patches. Could the researcher use this data with an inference procedure from this module to test a claim about (or to estimate the…

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