A-Level Maths | Regression Model for an Exponential Relationship on a Casio Classwiz fx-991EX

 

Aʙᴏᴜᴛ Tʜɪs Vɪᴅᴇᴏ – This video looks at coding data to change an exponential relationship between two variables to a linear relationship using logarithms. from this we can find the product moment correlation coefficient and the equation of the regression line. Once we have a and b values from the regression line we can de-code these and find the expression for the exponential relationship. We can also use the calculators stats mode to confirm that expression.

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Finding The Mean Of A Normal Distribution On A Casio Classwiz fx-991EX

 

 

Aʙᴏᴜᴛ Tʜɪs Vɪᴅᴇᴏ – This video looks at how you can find the mean of a normal distribution given a probability for a certain X value. We make use of the standard Normal distribution, with a standard deviation of 1 and a mean of 0 and find a relevant Z value. We then use this value in the formula for Z values and solve for the mean.

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Inverse Normal Distribution Function on a Casio Classwiz fx-991EX

 

 

Aʙᴏᴜᴛ Tʜɪs Vɪᴅᴇᴏ – This video looks at the inverse normal distribution function which enables you to find X values, given that you know the probabilities. The inverse feature makes reference to the Area under the normal distribution graph which represents the probability from the Normal cumulative distribution.

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Finding Probabilities For The Normal Distribution On Casio Classwiz fx-991EX

 

 

Aʙᴏᴜᴛ Tʜɪs Vɪᴅᴇᴏ – Using the Normal Cumulative Distribution, or Normal CD from the Distribution menu, we are able to calculate a range of different probabilities for the normal distribution. Where we have no lower or upper limit, then we need to use a high value, preferably at least 5 standard deviations away from the mean, but there is no reason not to go higher. Also, the video shows two methods of how you can find the probability for a region split between the upper and lower tail of the graph.

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