Asthma attack-heart failure patients

Assignment Help Basic Statistics

Reference no: EM13109728

1. It is suspected that high pollution levels (measured by number of particulates found in the air) increase the levels of asthma attacks. A researcher collects data on50 people who experienced an asthma attack during the course of one year. For each person the number of particulates was recorded for the day of the attack (day of attack) and for a day exactly one month before the day of the attack (control). The results are as follows:

Number of attacks.

Pollution day of attack > pollution on control day 30

Pollution day of attack < pollution on control day 15

Pollution day of attack = pollution on control day 5

Total 50

Assume a null hypothesis that pollution has nothing to do with having an asthma attack. How many attacks would you expect when the pollution level on the day of the attack is higher than the control day, ignoring the days when pollution level days are equal?

Given the data in the table, assess whether pollution is affecting asthma attacks. (Hint: use the normal approximation to the binomial distribution).

c. Now assume a seasonal variation on the pollution levels. Say in the winter instead of 30 we have 10, instead of 15 we have 4 and 2 cases when they are equal. Given this data does pollution affect asthma attacks?

6. Recently a clinical trial was conducted to test the ability of heart failure patients to improve the amount of time they could walk on a treadmill post a surgical intervention. 107 patients were randomly assigned to regular medical therapy and 105 to the surgical intervention. The patients were tested at baseline and again at 6 months post surgery. The results are shown below:

Mean Change in 6month-baseline (minutes) Standard deviation N

Regular medical therapy 0.5 2.2 100

Surgical procedure 2.1 3.1 99

What test would we do to test for a change in mean total change for a specific group?

b. Report the value of this test for the medical group and report a p-value.

7. It is very hard to predict how long post-surgical trauma patients typically spend in the ICU (those who survive to make it to the ICU). Below is typical data on the number of days spent in ICU for these types of patients from 2 different hospitals

Days in ICU..

Hospital ICU A 10, 21, 60, 32, 5, 29, 44, 8, 33, 26, 13

Hospital ICU B 76, 68, 87, 10, 86, 27, 125, 238, 96, 44, 73, 35, 60

Why is a t-test not a good test for this type of data?

b. Pick a non-parametric test that is most appropriate for determining if the number of days spent in the ICU for these two hospitals is comparable. What is the result of this test?

Reference no: EM13109728

Questions Cloud

Applied statistics-five step hypothesis : A nationwide sample of influential Republicans and Democrats was asked as part of a comprehensive survey whether they favored lowering environmental standards so that high-sulfur-coal could be burned in coal fired power plants.

Behaviour of structural material using comparative statement : The behaviour of structural materials using comparative statement when they are formed into structural member

Discuss the drawbacks and limitations of this approach : In a two to four page paper, explain how modern genetic technology may lead to personalized medicine. Give two or more specific examples of the benefits of personalized medicine. Discuss the drawbacks and limitations of this approach to human medi..

What are two other bacterial components : if you're interested in designing new antibiotics targeting bacteria aside from peptidoglycan, what are two other bacterial components you could target without necessarily causing harm to humans?

Asthma attack-heart failure patients : It is suspected that high pollution levels (measured by number of particulates found in the air) increase the levels of asthma attacks. A researcher collects data on50 people who experienced an asthma attack during the course of one year.

Calculate p-value for hypothesis test-intake linoleic acid : Test hypothesis that intake of linoleic acid in this group is lower than that of general population. Also, calculate p-value for hypothesis test.

What are the different levels : what is meant by increasing levels of organization in anatomy & physiology? What are the different levels & how do they relate to each other? What are examples for each level?

Develop free and independent trade union : Give your assessment of the requirements for Cuba to develop a free and independent trade union. Determine if it is essential for a free society.

Which is wild type for ebony mating with a true breeding : Scalloped (sd) wing is an X-linked recessive and ebony (e) body color is an autosomal recessive mutation in Drosophila. What proportion of scalloped, normal body colored males is expected in the F2 starting with a true breeding scalloped female wh..

User Account

All Pages