Statistics: Sample Distribution/ Sample Means
No pictures today, sorry. However, most of the work we did in class was covered in the text book, and the text book is actually quite good for this chapter.
p.187-190 'Sampling methods' - We talked about these for the first half of the double as well as working on questions 1-3, 5 on those pages. Descriptions for the different sampling methods are in the book.
p.191-192. We looked at taking samples of size 40 from a known population mean and population standard deviation. We took 6 samples using the graphing calculator, checked which was the closest to the sample mean, and which was the furthest. Someone in the class had a sample mean that was essentially equal to the pop. mean. Another person had a sample mean that had a difference of 8 for the population mean.
Taking the mean of these sample means have us a mean that was in most cases (but not all) closer to the population mean than any of their recorded data. To make it more accurate, we looked at collecting more samples.
p.193 we ran the command in procedure A (this will take 5-10 mins to run to completion). This essentially collects 100 different samples of size 40, and finds teh mean of each of them (using the known population mean and population standard deviation from the previous question). Homework is completing a Histogram of this data (you can use the bins on p.194).
p.187-190 'Sampling methods' - We talked about these for the first half of the double as well as working on questions 1-3, 5 on those pages. Descriptions for the different sampling methods are in the book.
p.191-192. We looked at taking samples of size 40 from a known population mean and population standard deviation. We took 6 samples using the graphing calculator, checked which was the closest to the sample mean, and which was the furthest. Someone in the class had a sample mean that was essentially equal to the pop. mean. Another person had a sample mean that had a difference of 8 for the population mean.
Taking the mean of these sample means have us a mean that was in most cases (but not all) closer to the population mean than any of their recorded data. To make it more accurate, we looked at collecting more samples.
p.193 we ran the command in procedure A (this will take 5-10 mins to run to completion). This essentially collects 100 different samples of size 40, and finds teh mean of each of them (using the known population mean and population standard deviation from the previous question). Homework is completing a Histogram of this data (you can use the bins on p.194).
posted by Mr. Crane at 7:20 AM
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