Answered: Is using meditation to relax and clear…

Is using meditation to relax and clear the mind a natural way to treat insomnia? Design an experiment to investigate this question. Assume that you hav

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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8:55 1 1 Student A imperial.instructure.com Experiment 1: You believe that caffeine can improve the capacity of short-term memory (STM). It is widely known that STM capacity 7 items (m=7)on average with a standard deviation of 2 items (s=2). You randomly sampled n=8 participants and have then drink a large quantity of coffee. Fifteen minutes later you administer a STM test to each participant and measure the number of items remembered. The data are shown below. Use these data to answer the following questions. Excel should be used to obtain the sample mean, standard deviation and standard error. Perform a 2-tailed z-test with a=0.05 to determine if caffeine influences memory. Number Participant of items 1 2 9 3 7 4 6 6 7 7 8 9
Can You Tell a Story About Your Parents? In a study, young adults in the US were asked to recall a story that their parent(s) had told them about a time when their parent(s) were young. In a report of the study, it was stated that “more than 90% of teenagers and young adults can retell family stories when asked, even if they seemed uninterested when the stories were told.” The actual results of the study were that 244 young adults out of the 260 young adults who were asked about this were able to recall such a story. (a) If the standard error for the distribution is 0.015, find a 95% confidence interval for the proportion of young US adults who can recall a story that parent(s) told them about when the parent(s) were young. (b) Is the 90% value that was stated in the report consistent with the confidence interval?
What type of test should be done?
Identify the appropriate test to use for the following scenario: There is a common belief that the phases of the moon have a powerful influence on behavior. In fact, the full-moon effect has been studied by a number of researchers. It is believed that the full moon negatively affects psychological functioning. To study this, a researcher analyzes the number of emergency admissions to psychiatric hospitals during nights when the moon is full. The researcher then analyzes the number of emergency admissions to the same psychiatric hospitals during nights when the moon is not full. The scores represent the number of admissions to each hospital on a random days throughout the year when the moon was full and a random days throughout the year when the moon was not full. Group of answer choices A) Correlated Groups t-test B) Independent Groups t-test C) Regression D) One sample
this is part 2 of a question. Although older Americans are most afraid of crime, it is young people who are more likely to be the actual victims of crime. It seems that older people are more cautious about the people with whom they associate. A national survey showed that 10% of all people ages 16-19 have been victims of crime.† At a high school, a random sample of n = 66 students (ages 16-19) showed that r = 11 had been victims of a crime. Note: For degrees of freedom d.f. not in the Student's t table, use the closest d.f. that is smaller. In some situations, this choice of d.f. may increase the P-value a small amount and thereby produce a slightly more "conservative" answer. Find a 90% confidence interval for the proportion of students in this school (ages 16-19) who have been victims of a crime. (Round your answer to three decimal places.) lower limit upper limit (c) How large a sample size should be used to be 95% sure that the sample proportion p̂ is within…
A clinical psychologist wants to test the effectiveness of three new therapies that have been developed for reducing anxiety symptoms. The researcher recruits 15 participants and randomly assigns them to take part in Therapy A, Therapy B, or Therapy C for a month. At the end of the month, the researcher measures the participants' anxiety symptoms on a scale from 1 to 10 (where a higher score means more anxiety symptoms). The participants' scores are shown below: What is the appropriate test to use ? 3. What are the null and alternative hypotheses ? 4. Using a two-tailed alpha of .05, determine what the critical value is 5. Calculate the test statistic 6. State whether you reject or fail to reject the null hypothesis for the omnibus test 7. Calculate and report the effect size for the omnibus test 8. Perform a Post-Hoc Test. Report the significance of each pairwise comparison
Immediate feedback to incorrect exam answers.Researchers from the Educational Testing Service (ETS) found that providing immediate feedback to students answering open-ended questions can dramatically improve students’ future performance on exams (Educational and Psychological Measurement, Feb. 2010). The ETS researchers used questions from the Graduate Record Examination (GRE) in the experiment. After obtaining feedback, students could revise their answers. Consider one of these questions. Initially, 50% of the students answered the question correctly. After providing immediate feedback to students who answered incorrectly, 70% answered correctly. Consider a bank of 100 open-ended questions similar to those on the GRE.a. In a random sample of 20 students, what is the probability that more than half initially answer the question correctly? b. Refer to part a. After providing immediate feedback, what is the probability that more than half of the students answer the question…
can you please help me with my stats homework?
Part A. Depression affects many people. 25 out of 100 people with untreated depression will lose at least one friendship while not receiving treatment. On the other hand, when people with depression are treated with medication and counseling, only 2 out of 100 will lose at least one friendship during treatment. The absolute risk of losing at least one friendship while being treated with medication and counseling is Answer: 2 / 100 = 0.02 = 2%
R %24 FE %#3 %24 Is the proportion of wildfires caused by humans in the south higher than the proportion of wildfires caused by humans in the west? 374 of the 522 randomly selected wildfires looked at in the south were caused by humans while 390 of the 563 randomly selected wildfires looked at the west were caused by humans. What can be concluded at the a = 0.01 level of significance? a. For this study, we should use Select an answer b. The null and alternative hypotheses would be: :0H H1: Select an answer Select an answer Select an answer (please enter a decimal) Select an answer Select an answer Select an answer (Please enter a decimal) c. The test statistic ? O (please show your answer to 3 decimal places.) d. The p-value (Please show your answer to 4 decimal places.) e. The p-value is ? e a f. Based on this, we should elect an answer the null hypothesis. g. Thus, the final conclusion is that O The results are statistically insignificant at a = 0.01, so there is statistically…
A. Headache Pain : There are many over-the-counter pain relievers. By the end of the semester, you have a tremendous headache and are looking for the most effective pain relief available. You conduct a study comparing the three most popular pain relievers and a placebo to see which work best. You use only subjects with headaches and record the amount of time (in minutes) it takes for their headache to go away after they receive the medication. You randomly assign 60 participants to one of the four conditions using a double- + blind procedure. (Use a = Placebo 70 Drug A 30 Drug B 10 Drug C 10 30 60 40 20 50 40 10 10 60 30 40 10 10 40 30 30 30 30 30 10 40 20 20 20 60 40 20 30 50 30 30 10 30 30 20 20 60 20 10 10 20 40 20 30 20 50 20 10 40 20 30 30 State the hypotheses Critical value and df Test statistic