1. A researcher is interested in the effect that exercise and gender may have on LDL ("bad") cholesterol levels. The researcher has data that classifies individuals, who are all on a similar diet, by gender (male or female) and level of exercise (adequate or inadequate). Suppose that the following cholesterol values represent the population means (so any effect is "real" and no significance testing is necessary): Exercise: Adequate 180 Inadequate 220 Males Females 165 (a) If there is no interaction between these two factors, what is the value of the missing mean cholesterol level (i.e., for females who get inadequate exercise) in the table above? Explain how you obtained your answer.
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.
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