189 Answered Questions for the topic biostatistics

Biostatistics

09/14/16

Combination or Permutation
From our class, (20 females, 15 males), four students are to be chosen to form a committee. In how many different ways can the student be chosen such that there would be at least one female?
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Biostatistics

09/14/16

In a statistics class, the female to the male ratio is 4 to 3. If there are 40 females, how many males are there? What if the ratio is 5 to 2?
The professor did not explain ratios to anyone and refuses to help with this homework.
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Biostatistics

05/01/16

Explain how both doctors’ explanations could be wrong using the regression to the mean concept.
A doctor is in the habit of measuring blood pressure twice. She notices that patients who are unusually high on the first reading tend to have somewhat lower second readings. She concludes that... more
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Biostatistics

03/10/16

Statistics: Probability Help Needed
A publisher prints 300 words per page in its books. Historically the publisher has found that authors make, on average, one typo every 250 words:1.How many typos would you expect to find in single... more
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Biostatistics Statistics Question

02/23/16

Statistics Question
Assume the average weight of a full-term newborn infant (i.e. 39-40 weeks gestation) in the US is 3400g. Suppose we measure the birth weight of 1000 (full-term) infants born to alcoholic mothers.... more
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Biostatistics Statistics

02/23/16

Biostatistics Question
Prior to the initiation of a rubella immunization program in a metropolitan county, a survey revealed that 55 out of a sample of 100 elementary school children in the county had been immunized... more
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Biostatistics

11/03/15

A randomized research study is designed to determine whether albuterol by nebulization improves pulmonary function in children with bronchiolitis.
A randomized research study is designed to determine whether albuterol by nebulization improves pulmonary function in children with bronchiolitis. Twenty chidren, ten of whom receive albuterol and... more
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Biostatistics

10/17/15

Biostatistics in health care
 a recent study reported that the prevalence of obesity is 45% in children ages 6-12. If 15 children were analyzed what is the probability that 7 are obese?
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Biostatistics

09/25/15

Biostatistics question.
You have just bought a new car that claims to get a highway efficiency of 31 miles per gallon. Of course, your mileage will "vary". If you had to guess, would you expect the interquartile range... more
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Biostatistics

06/26/15

Haemoglobin level of pregnant women follow a normal distribution. If 40 out of 1000 women and 200 of 1000 have haemoglobin less than 9 and 10 respectively.
Find the mean and stand deviation?
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Biostatistics Linear Regression

12/09/14

Use linear regression to analyze the relationship between time since introduction and the natural log of snake population size.
Years after Introduction(X)       Number(Y)        (Xi - X)    (Yi - Y)    (Xi - X)(Yi - Y) 1                                                  4                  -4.5       -167.3          ... more
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Biostatistics Statistics

09/04/14

Statistics HELP!!!
You plan to conduct an experiment to test the effectiveness of Sleepeze, a new drug that is supposed to reduce insomnia. You will use a sample of subjects that are treated with the drug and another... more
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Biostatistics Statistics Mathematics

04/11/13

Bio Stat Question:
1. Is there a difference in age between patients on the fast-track protocol, and those receiving standard care? 2. Is the proportion of patients who are female in the fast-track group... more
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Biostatistics

02/13/13

if 30% of children age 2-6 have high cholesterol, and 12 are analyze what is the probability that exactly 3 have high cholesterol
Biostatistics
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