Today we started off the class with our 43rd Mental Math. I would like to take this time to thank "chevy" for blogging yesterday. We need more people to step up like this. Anyways, a homework check followed M.M. on Question #2 from the Statistics Review booklet.
Mr. Maksymchuk corrected the question in the following slides showing how to figure out the test mark that the board should use as the cut for identifying gifted students.
The green under the graph represents the 48,000 students that will be tested. There is a 1% chance that if selected randomly from the 48,000 students, they will be gifted. (480 in total)
Using the "invnorm" technique, you can figure out the test score.
Type the following into your calculator:
invnorm (.99, 100, 15); and you will receive an answer of 134.9.
This answer means that 134.9 is the test score that will indicate the 480 gifted students.
Using the ronblond.com website and using the normal distribution program will also help you answer this question.
Next we moved onto a lesson on "z-scores."
We also did an example to involving "z-scores."
Homework for this weekend: Questions #8, and you can work on the rest of the multiple choice pertaining to z-scores, but they aren't necessarily for homework.
Mr. Maksymchuk recorded himself during this lesson on "z-scores". Listen to hear a full recording of the lesson on this topic.
Have an awesome weekend everyone!!
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