Q.7 A company is evaluating an “herbal" drug to see if it changes the time it takes to overcome jet lag after long distance flights. Nine people who take frequent trips from Sydney to San Francisco were chosen. Each person is assigned to take a placebo for one of their trips and the drug for the other trip, in random order. Each volunteer reported the number of days it took to recover from jet lag for each of the trips. The results were: Person Placebo 1 3 4 5 6 7 8 7 8 5 6 5 3 7 8 4 Drug 4 4 4 2 8 2
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.
How do you do the 95% confidence interval and the test of significance a = 0.05?
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