16. A certain stimulus administered to each of 12 patients resulted in the followingchanges in blood pressure :5,2,8, -1,3,0,2,1,5, 0,4,6.Can it be concluded that the stimulus will in general be accompanied by an increase in bloodpressure ?

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Answered: 16. A certain stimulus administered to…

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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16.
1. Three different treatments are given to 3 groups of patients with anemia. Increase in Hb% level was noted after one month and is given below. Test whether the difference in improvement in 3 groups is significant or not? Group A 3 1 2 0 1 2 2 Group B 3 2 2 3 1 3 2 Group C 3 4 5 4 2 2 4
The following table represents the marks obtained by a batch of 10 students in certain class tests in statistics and accountancy. 1 2 3| 4 5 6 | 7 | 8 Serial No. 10 Marks 53 55 52 32 30 60 47 46 35 28 (Statistics) Marks 57 45 24 31 25 84 43 80 32 72 (Ассоuntancy) Indicate in which subject is the level of knowledge higher?
7. In a sample of n= 6, five individuals all have scores of X= 10 and the sixth has a score of X=16. What is the mean for this sample?
A researcher is interested in whether Drug A affects appetite in babies aged below 5 years. Sixteen babies were selected of which 8 were given Drug A and 8 were not given any Drug. The children appetite levels were measured on a scale from 1 to 25 (1=Low Appetite, 25=High Appetite). The Table below presents the results of the findings: No Drug Drug A 15 10 22 15 18 11 24 22 19 18 22 14 19 16 23 19 a) With reasons, determine whether the data is: i. Continuous/Categorical ii. Qualitative/Quantitative iii. Measurement scale (Nominal, Ordinal, Ratio, Interval) b) What is the line of best fit?
14. A total of 12 participants were randomly assigned to one of three treatment groups: antidepressant medication ("drug"), weekly psychotherapy ("therapy”), or no treatment ("control"). Depression scores were collected 8 weeks after treatment began. We want to know how effective the depression treatments were (that is, do the mean depression scores differ between groups?). Drug Drug Drug b) Determine what test to use. Drug Therapy Therapy Therapy Therapy Control Control Control Control a) What are the null and alternative hypotheses? 8 9 14 6 12 7 15 8 22 25 18 20 c) Determine alpha, how many tails are there, what are the df and find a critical value.
3. An integer is randomly chosen from the set 1, 2,..., 100. If this integer is divisible by 2 we let Y = 0, and if it is not divisible by 2 but is divisible by 3 then Y = 1. We let Y = 2 in all other cases. Find mean and variance of Y.
4.2#12 Amwser question 12
An investigator analyzed the leading digits from 794 checks issued by seven suspect companies. The frequencies were found to be 218, 130, 106, 83, 65, 48, 48, 37, and 59, and those digits correspond to the leading digits of 1, 2, 3, 4, 5, 6, 7, 8, and 9, respectively. If the observed frequencies are substantially different from the frequencies expected with Benford's law shown below, the check amounts appear to result from fraud. Use a 0.025 significance level to test for goodness-of-fit with Benford's law. Does it appear that the checks are the result of fraud? Leading_Digit Actual_Frequency Benford's_Law:1) 218 30.10%2 )130 17.60%3) 106 12.50%4) 83 9.70%5) 65 7.90%6) 48 6.70%7) 48 5.80%8) 37 5.10%9) 59 4.60% Calculate the test statistic, χ2 =? (Round to three decimal places as needed.) Calculate the P-value=? (Round to four decimal places as needed.)
were Classified 2. Pg, 36-7, 1.4.33. At the beginning of a Study individuals, 3% were Classified as heavy Smokers, 25.1. Smokers, and 72% were classified as as light In the 5 year study, it was determined. that the death rates of the heavy and light Smokers were 6 and 3 times that of non smokers. non- of Smokers, respectively. A randomly selected Participant died over the Syear period: Calculate the probability that the participant а nonsmorcer? was
6. As a researcher for an environmental agency, you have been asked to determine if the air quality in the Philippines has changed over the past 2 years. You select a random sample of 7 metropolitan cities and find the number of days each year that these cities failed to meet acceptable air quality standards. The results were given below. Can we conclude that after a year, there is no improvement in the air = 0.15. quality in the Philippines? Use a = City Year 1 Year 2 1 18 24 2 50 77 3 9 13 4 22 21 5 30 44 6 29 23 7 1 6
In an experiment, 10 participants were given a test of mental performance in stressful situations. Their scores were 2, 2, 4, 1, 4, 3, 0, 2, 7, and 5. Ten other participants were given the same test after they had been trained in stress-reducing techniques. Their scores were 4, 4, 6, 0, 6, 5, 2, 3, 6, and 4. Do the appropriate t-test to determine if the group that had been trained had different mental performance scores than the group that had not been trained in stress reduction techniques. What do these results mean?Hint: Begin by entering all of the scores in PSPP and assigning your experimental group and control group! 1. What is the control group mean? 2. Should you reject the null hypothesis? yes we do not have enough information to make this decision without follow-up analysis no 3. Which of the following variables is interval/ratio?the participant's gender whether or not a participant had the stress-reduction training the score on the test of mental performance the…

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16. A certain stimulus administered to each of 12 patients resulted in the following changes in blood pressure : 2, 5, 8, 1, 3, 0, 2, 1, 5, 0, 4, 6. Can it be concluded that the stimulus wil! in general be accompanied by an increase in blood pressure ?