sample vs. population proportion using a z-score in excel
I'm not particularly skilled in mathematics, but I am trying to determine the true average of a simple table of scores:
Name, ExamQty, Score
Jim, 1, 10
Bob, 2, 5
Average = 8.33
Preferably I would like a formula in column D that when summed or averaged, it will provide me with 8.33
I need a statistically valid, randomly selected breakout of transactions from a total population of all transactions. Would like to have Excel generate a statistically valid list from a total population of about 38K transactions. All 38K transactions, regardless of dollar value, are subject to review through random selection based on the n of total population. The list should also induce any transaction >= $5,00. The listing should include all data elements of the select transactions.
Does anyone know if Excel can display the sample group population within the chart i.e. N=100, (if 100 people answered the question) obviously this can be done manually but it would be cool if excel could do it itself.
The reason I want to do this is so the reader of the graph can gauge the significance of the % figures, my chart is reading of a pivot table which I plan to update over time with new data so has to be dynamic, maybe there is another solution which could work,
at Excel and need help graphing a sampling distribution of of the sample proportion. sample is 150, sample proportion is .15, std deviation is .029 How do I make a normal bell curve?
The standard deviation in "descriptive statistics" in "data analysis" is sample standard deviation not population SD. How can I get the population SD?
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