A recent drug study revealed that a new drug on the market reduces cholesterol levels by an average of 20 mg/dL with a standard deviation of 6 mg/dL. You think it is more than that. You examine levels of 20 people on the drug (you have access to their before and after levels). The average reduction was 23 mg/dL. With a significance level of 0.05, is your hunch correct? yes or no
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.
A recent drug study revealed that a new drug on the market reduces cholesterol levels by an average of 20 mg/dL with a standard deviation of 6 mg/dL. You think it is more than that. You examine levels of 20 people on the drug (you have access to their before and after levels). The average reduction was 23 mg/dL. With a significance level of 0.05, is your hunch correct?
yes
or
no
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