When working with statistics, OpenOffice.org Calc is handy to calculate a confidence interval. The purpose is to estimate the mean (average) of a population from a sample of the population. As a typical example CNN reported, "63 percent of respondents say [New Orleans] should rebuild" after ...
Calculating ROI in Excel Example Let’s imagine we recently sold an antique on eBay and wanted to figure out the ROI in Excel. First, we need to label our cells. Let’s type “initial cost” in cell A1, “financial gain” in cell B1, and “ROI" in cell C1. Next, it’s time t...
Value at Risk (VaR) is a financial metric that estimates the risk of an investment. More specifically, VaR is a statistical technique used to measure the amount of potential loss that could happen in an investment portfolio over a specified period of time. Value at Risk gives the probability ...
Here we need to be careful that all of the units we are using are the same. There will not be as many conversions if we do our calculations with inches. Since there are 12 inches in a foot, five feet corresponds to 60 inches. Thez-score for this problem is (62 - 60)/3 and is...
interval. The next column (I) accumulates the Total time-currency by adding all the time-currency calculated for each row in a sequential manner row by row. Columns H and I comprise the time-currency invested or borrowed portion of the invention. The next column (Column J) inputs the ...
In this case Z0.95 = 1.645. Other common confidence levels used are 90% and 99%. Corresponding z values are given below for convenient reference: Confidence levelz 90% 1.282 95% 1.645 99% 2.326 Example: Given one-year monthly data of AMZN, TSLA and AAPL within the time interval of 11/...
If the population mean is actually 10.75 ounces, what is the probability of a Type II error? We begin by reformulating our decision rule in terms of the sample mean. For a significance level of 0.01, we reject the null hypothesis whenz< -2.33. By plugging this value into the formula for...