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39. An investigator conducts a study to investigate whether there is a difference in mean PEF...
Peak expiratory (PEF) is a measure of a patient's ability to excel air from the lungs....
Peak expiratory (PEF) is a measure of a patient's ability to excel air from the lungs. Patients with asthma or other respiratory conditions often have restricted PEF. An investigator conducts a study to investigate whether there is a difference in mean PEF in children with chronic bronchitis as compared to those without. Data on PEF are collected and summarized below. Based on the data, is there statistical evidence of a lower mean PEF in children with chronic bronchitis as compared...
How many children would be required to ensure that the margin of error in (a) does...
How
many children would be required to ensure that the margin of error
in (a) does not exceed 10 units?
2. Consider again the study in Question 1, a different investigator conducts a second study to investigate whether there is a difference in mean PEF in children with chronic bronchitis as compared to those without. Data on PEF are collected and summarized below. Based on the data, is there statistical evidence of a lower mean PEF in children with chronic...
Peak expiratory flow (PEF) is a measure of a patient’s ability to expel air from the...
Peak expiratory flow (PEF) is a measure of a patient’s ability
to expel air from the lungs. Patients with asthma or other
respiratory conditions often have restricted PEF. The mean PEF for
children free of asthma is 306. An investigator wants to test
whether children with chronic bronchitis have restricted PEF. A
sample of 40 children with chronic bronchitis are studied and their
mean PEF is 279 with a standard deviation of 71. Is there
statistical evidence of a lower...
Peak expiratory flow (PEF) is a measure of a patient’s ability to expel air from the...
Peak expiratory flow (PEF) is a measure of a patient’s ability to expel air from the lungs. Patients with asthma or other respiratory conditions often have restricted PEF. The mean PEF for children free of asthma is 306. An investigator wants to test whether children with chronic bronchitis have restricted PEF. A sample of 100 children with chronic bronchitis are studied and their mean PEF is 292. Assume the population standard deviation is 75. Is there statistical evidence of a...
1) Dr. Dumbledore decides to use these data to test whether there is a significant difference in mean distance walked between men with and without beards. What is the appropriate statistical test for...
1) Dr. Dumbledore decides to use these data to test whether
there is a significant difference in mean distance walked between
men with and without beards. What is the appropriate statistical
test for him to use?
2) Carefully write down the null and alternative hypotheses for
Dumbledore's test, being sure to define any symbols you use. (You
may use words like "mu" in place of the Greek letter.)
3) Dr. Dumbledore conducts the test and (correctly) obtains a
test statistic...
All of the following questions are in relation to the following journal article which is available...
All of the following questions are in relation to the following journal article which is available on Moodle: Parr CL, Magnus MC, Karlstad O, Holvik K, Lund-Blix NA, Jaugen M, et al. Vitamin A and D intake in pregnancy, infant supplementation and asthma development: the Norwegian Mother and Child Cohort. Am J Clin Nutr 2018:107:789-798 QUESTIONS: 1. State one hypothesis the author's proposed in the manuscript. 2. There is previous research that shows that adequate Vitamin A intake is required...
Identify the scientific premise, main hypothesis addressed by the paper and the research question of the...
Identify the scientific premise, main hypothesis addressed by
the paper and the research question of the paper
Also, what is the main results and the implication of
results
IMPORTANCE Clinical outcomes for glioblastoma remain poor. Treatment with immune checkpoint blockade has shown benefits in many cancer types. To our knowledge, data from a randomized phase 3 clinical trial evaluating a programmed death-1 (PD-1) inhibitor therapy for glioblastoma have not been reported. OBJECTIVE To determine whether single-agent PD-1 blockade with nivolumab...
explaim the mechanisms amd toxological effects if type 1 diabetes in this article Exposure to arsenic...
explaim the mechanisms amd toxological effects if type 1
diabetes in this article
Exposure to arsenic in drinking water is associated with increased prevalence of diabetes. We previously reported an association of diabetes and urinary concentration of dimethylarsinite (DMAS"), a toxic product of arsenic methylation by arsenic (+ 3 oxidation state) methyltransferase (AS3MT). Here we examine associations between AS3MT polymorphism, arsenic metabolism and diabetes. Fasting blood glucose, oral glucose tolerance and self-reported diagnoses were used to identify diabetic individuals. Inorganic...
How
many children would be required to ensure that the margin of error
in (a) does not exceed 10 units?
2. Consider again the study in Question 1, a different investigator conducts a second study to investigate whether there is a difference in mean PEF in children with chronic bronchitis as compared to those without. Data on PEF are collected and summarized below. Based on the data, is there statistical evidence of a lower mean PEF in children with chronic...
Peak expiratory flow (PEF) is a measure of a patient’s ability
to expel air from the lungs. Patients with asthma or other
respiratory conditions often have restricted PEF. The mean PEF for
children free of asthma is 306. An investigator wants to test
whether children with chronic bronchitis have restricted PEF. A
sample of 40 children with chronic bronchitis are studied and their
mean PEF is 279 with a standard deviation of 71. Is there
statistical evidence of a lower...
1) Dr. Dumbledore decides to use these data to test whether
there is a significant difference in mean distance walked between
men with and without beards. What is the appropriate statistical
test for him to use?
2) Carefully write down the null and alternative hypotheses for
Dumbledore's test, being sure to define any symbols you use. (You
may use words like "mu" in place of the Greek letter.)
3) Dr. Dumbledore conducts the test and (correctly) obtains a
test statistic...
All of the following questions are in relation to the following journal article which is available on Moodle: Parr CL, Magnus MC, Karlstad O, Holvik K, Lund-Blix NA, Jaugen M, et al. Vitamin A and D intake in pregnancy, infant supplementation and asthma development: the Norwegian Mother and Child Cohort. Am J Clin Nutr 2018:107:789-798 QUESTIONS: 1. State one hypothesis the author's proposed in the manuscript. 2. There is previous research that shows that adequate Vitamin A intake is required...
Identify the scientific premise, main hypothesis addressed by
the paper and the research question of the paper
Also, what is the main results and the implication of
results
IMPORTANCE Clinical outcomes for glioblastoma remain poor. Treatment with immune checkpoint blockade has shown benefits in many cancer types. To our knowledge, data from a randomized phase 3 clinical trial evaluating a programmed death-1 (PD-1) inhibitor therapy for glioblastoma have not been reported. OBJECTIVE To determine whether single-agent PD-1 blockade with nivolumab...
explaim the mechanisms amd toxological effects if type 1
diabetes in this article
Exposure to arsenic in drinking water is associated with increased prevalence of diabetes. We previously reported an association of diabetes and urinary concentration of dimethylarsinite (DMAS"), a toxic product of arsenic methylation by arsenic (+ 3 oxidation state) methyltransferase (AS3MT). Here we examine associations between AS3MT polymorphism, arsenic metabolism and diabetes. Fasting blood glucose, oral glucose tolerance and self-reported diagnoses were used to identify diabetic individuals. Inorganic...
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