Posted: February 6th, 2015

Statisics in Health Care

Statisics in Health Care

Project description

answer questions correctly. This assignment should not exceed one page. Just answer a,b,c,d where applicable.

11.The purpose of a z score is to:
a.Establish a correlation between two variables.
b.Test for differences between more than two experimental conditions.
c.Transform raw scores into a common unit of measurement.
d.All of the answers are correct.

12.If you want to calculate a z score for a test where your raw score was 24, what other information must you know?
a.Shape of the distribution
b.Mean, Median, and Mode
c.Mean and Standard Deviation
d.Standard deviation only

13.To calculate a z-score, you:
a.Subtract the mean from the raw score, and divide this difference by the standard deviation.
b.Subtract the mean from the raw score, and divide this difference by the variance.
c.Subtract the raw score from the mean, and divide this difference by the standard deviation.
d.Subtract the raw score from the mean, and divide this difference by the variance.

14.Scores on a midterm exam are normally distributed with a mean of 40 and standard deviation of 5. The following scores

were drawn from the distribution: 25, 38, 65, 70, 74, 85, and 90. Transform these raw scores to z-scores.

15.A health psychologist collects data on the number of stressful events that people experience on a weekly basis. If the

mean of the sample is 16.00 and standard deviation is 4.00. Calculate the z scores for the following raw scores:
8, 10, 15, 18, and 21

16.A researcher is interested in determining whether a new anti-anxiety drug relieves anxiety in college students studying

statistics. Fifteen students were assigned to one of three conditions: five students received a placebo, five received 50

mg of the new drug, and five received 100 mg of the drug. The students were then placed in a quiet room and were given 15

statistics problems to do. They were administered by the researchers assistant. After completing the problems, the papers

were scored and the number of errors made by each student was used to determine their levels of anxiety.
Based on the information provided above:
a.Identify the dependent and independent variables.
b.Determine the type of measurement scale used (nominal, ordinal, interval, and ratio).
c.Explain why the sample used is or is not representative of the population.
d.Using only the information above, give an operational definition of anxiety.
e.Define confounding variable and cite some examples that could create problems in this experiment.
17.If a statistical test is significant, it means that
a.It has important clinical applications
b.The study had acceptable power
c.The null hypothesis was rejected
d.All of the above.

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