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 patients...

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 patients...

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...

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....

I am trying to examine the powering for a study using response rate as a endpoint. Normally I convert to Cohen's d and determine power from there, how come when I convert the odds ratio...

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 against...

A study was conducted to evaluate the effect of calcium supplement on preventing postmenopausal osteoporosis. Among 300 women aged 60 and above who took calcium supplements regularly, 15% had postmenopausal...

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...

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?

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...

Find the mean and stand deviation?

Years after Introduction(X) Number(Y) (Xi - X) (Yi - Y) (Xi - X)(Yi - Y) 1 ...

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...

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 significantly...

Biostatistics

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