Low blood oxygen saturation (02 saturation) is a common clinical indicator inCOVID-19 patients who need to come to hospital and can also be a reason their careis escalated to intensive care. What about people who recover at home? Researchersfollow a sample of COVID-19 patients to compare the mean 02 saturation (in %)between patients who need hospitalization, patients who need intensive care. andpatients who recover at home.Two sample t-testOANOVAO Chi square testO One sample t-testPaired t-testRegression and correlationZ Score method

ANOVA: Suppose the hypothesis test is performed to determine a significant difference between more…

Answered: Low blood oxygen saturation (02…

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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A recent article reported "A one-way analysis of variance found that GRE scores varied according to the type of test preparation students engaged in prior to taking the examination, F (4, 187) = 14.08, p < .01." What is the dependent variable? What is the independent variable? How many levels of the independent variable were there? How many subjects participated in the study?
A researcher was interested in comparing the resting pulse of people who exercise regularly and people wo do not exercise regularly. Independent simple random samples of 16 people ages 30-40 who do no exercise regularly and 12 people ages 30-40 who exercise regularly were selected, and the resting pulse rate of each person was measured. The summary statistics are as follows. Do not exercise Do exercise X1= 73.9 X2= 69.1 S1= 10.9 S2= 10.9 N1= 16 N2=12 1. Verify the conditions needed to proceed with hypothesis testing or Confidence intervals. 2. At the 5% significance level, do the data provide sufficient evidence to conclude that the mean resting pulse rate of people who do not exercise regularly is greater than the mean resting pulse rate of people who exercise regularly? State your null, alternate hypothesis, calculate the test statistic, determine your decision and interpret your decision. 3. Find the 95% confidence interval around the difference between the sample…
If all participants in a repeated measures research study show roughly the same difference between treatments, then the data will produce a statistically significant value for the t statistic. True or false
Is the proportion of wildfires caused by humans in the south higher than the proportion of wildfires caused by humans in the west? 408 of the 536 randomly selected wildfires looked at in the south were caused by humans while 393 of the 579 randomly selected wildfires looked at the west were caused by humans. What can be concluded at the = 0.01 level of significance? For this study, we should use Select an answer t-test for a population mean t-test for the difference between two independent population means t-test for the difference between two dependent population means z-test for a population proportion z-test for the difference between two population proportions The null and alternative hypotheses would be: Select an answer μ1 p1 Select an answer > ≠ < = Select an answer p2 μ2 (please enter a decimal) Select an answer μ1 p1 Select an answer < > ≠ = Select an answer μ2 p2 (Please enter a decimal) The test statistic ? t z = (please show your…
Left ventricular mass (LVM) is an important risk factor for subsequent cardiovascular disease. A study is proposed to assess the relationship between childhood blood-pressure levels and LVM in children as determined from echocardiograms. The goal is to stratify children into a normal bp group (< 80th percentile for their age, gender, and height)and an elevated bp group (≥ 90th percentile for their age, gender, and height) and compare change in LVM between the two groups. Before this can be done, one needs to demonstrate that LVM actually changes in children over a 4-year period. To help plan the main study, a pilot study is conducted where echocardiograms are obtained from 10 random children from the Bogalusa Heart Study at baseline and after4 years of follow-up. The data are given in images. a) Suppose the investigators are reluctant to assume that the change in LVM over four years is normally distributed. What test can be used to assess if there is a change in mean LVM over four…
A data set includes weights of garbage discarded in one week from 62 The paired weights of paper and glass were used to obtain the results shown to the right. Is there sufficient evidence to support the claim that there is a linear correlation between weights of discarded paper and glass? Use a significance level of a = 0.05. iniont ?
What’s the effect? A researcher studying violent behav-ior in elementary school children asks the children’s par-ents how much time each child spends playing computer games and has their teachers rate each child on the levelof aggressiveness they display while playing with otherchildren. Suppose that the researcher finds a moderately strong positive correlation. Describe three different pos-sible cause-and-effect explanations for this relationship.
A researcher uses an analysis of variance to test for mean differences among three treatments with a sample of n = 19 in each treatment. The F-ratio for this analysis would have which df values?
A physical therapist wanted to know whether the mean step pulse of men was less than the mean step pulse of women. She randomly selected 54 men and 70 women to participate in the study. Each subject was required to step up and down a 6-inch platform. The pulse of each subject was then recorded. The following results were obtained. Two sample T for Men vs Women N Mean StDev SE Mean Men Women 98% CI for mu Men - mu Women (- 12.20, - 1.00) T-Test mu Men = mu Women (vs H2 O C. Ho: H1 = H2; Ha: H1 #H2 (b) Identify the P-value and state the researcher's conclusion if the level of significance was a = 0.01. What is the P-value? P-value =
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true or false MSBetween represents the variability that is only affected by unsystematic factors.
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