Sheep Fiber Length (cm) Fleece Weight (kg) 5 11.0 9.1 6 4.5 4.9 7 7.4 6.0 8 5.9 5.1 (a) What are the mean, variance, and standard deviation for each trait in this flock? (b) What is the covariance of the two traits? (c) What is the correlation coefficient for fiber length and fleece weight? (d) Do you think greater fleece weight is correlated with an increase in fiber length? Why or why not?
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.
Sheep Fiber Length (cm) Fleece Weight (kg)
5 11.0 9.1
6 4.5 4.9
7 7.4 6.0
8 5.9 5.1
(a) What are the
for each trait in this flock?
(b) What is the
(c) What is the
fleece weight?
(d) Do you think greater fleece weight is correlated with
an increase in fiber length? Why or why not?
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