Correct reading y(bar) 0.96 1.33 1.75 2.14 2.58 2.97 3.38 3.75 (a) Find the least squares line for the data (b) Predict the correct reading, y , for a given gauge level of 3.3 (c) Determine at the 5% level whether there is evidence to indicate a linear relationship between reading of gauge, x and correct readings y.
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 repair workshop finds it is having a problem with a pressure gauge it uses. It decides to have it
checked by a specialist firm. The following data was obtained.
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Reading of Gauge x(bar) 1.0 1.4 1.8 2.2 2.6 3.0 3.4 3.8
Correct reading y(bar) 0.96 1.33 1.75 2.14 2.58 2.97 3.38 3.75
(a) Find the least squares line for the data
(b) Predict the correct reading, y , for a given gauge level of 3.3
(c) Determine at the 5% level whether there is evidence to indicate a linear relationship
between reading of gauge, x and correct readings y.
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