Find the mean, the median, the mode, and the midrange, the range, variance, standard deviation, 65th percentile. The increases ( in cents) in cigarette taxes for 17 states in a 6 month period are 60, 20, 40, 40, 45, 12, 34, 51, 30, 70,42,31,69,32,8,18,50 Also use te range rule of thumb to estimate the standard deviation. Compare the estimate to the actual standard deviation. 2. An instructor grades exams, 20%; term paper, 30%; final exam, 50%. A student had grades of 83, 72, and 90, respectively, for exams, term paper, and final exam. Find the students final average. Use the weighted mean.
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.
Find the
60, 20, 40, 40, 45, 12, 34, 51, 30, 70,42,31,69,32,8,18,50
Also use te range rule of thumb to estimate the standard deviation. Compare the estimate to the actual standard deviation.
2. An instructor grades exams, 20%; term paper, 30%; final exam, 50%. A student had grades of 83, 72, and 90, respectively, for exams, term paper, and final exam. Find the students final average. Use the weighted mean.
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