Could listening to rock music raise your blood pressure?To find out, researchers randomly divided 50 subjects into two groups. For 10 minutes, people in one grouplistened to loud rock music and those in the other group listened to soft jazz. The researchers recorded each per-son’s change in blood pressure, and plan to run a hypoth-esis test to see if there’s a significant difference between the mean changes for the two groups. Which conditionsmust they check before proceeding?I. The subjects are a random sample of the population.II. The two groups are independent.III. The blood pressure changes for each group areapproximately Normal.A) III only B) I and II only C) I and III onlyD) II and III only E) I, II, and III
Inverse Normal Distribution
The method used for finding the corresponding z-critical value in a normal distribution using the known probability is said to be an inverse normal distribution. The inverse normal distribution is a continuous probability distribution with a family of two parameters.
Mean, Median, Mode
It is a descriptive summary of a data set. It can be defined by using some of the measures. The central tendencies do not provide information regarding individual data from the dataset. However, they give a summary of the data set. The central tendency or measure of central tendency is a central or typical value for a probability distribution.
Z-Scores
A z-score is a unit of measurement used in statistics to describe the position of a raw score in terms of its distance from the mean, measured with reference to standard deviation from the mean. Z-scores are useful in statistics because they allow comparison between two scores that belong to different normal distributions.
Could listening to rock music raise your blood pressure?
To find out, researchers randomly divided 50 subjects
listened to loud rock music and those in the other group
son’s change in blood pressure, and plan to run a hypoth-
esis test to see if there’s a significant difference between
must they check before proceeding?
I. The subjects are a random sample of the population.
II. The two groups are independent.
III. The blood pressure changes for each group are
approximately Normal.
A) III only B) I and II only C) I and III only
D) II and III only E) I, II, and III
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