Again, we assume that the (theoretical) population mean is 4, the sample mean is 5.0, and the sample standard deviation s is 1.936. Now, the standard error will be When N = 20, the critical value for a 5% significance test will be 2.09 (because the t-distribution curve is closer to the normal distribution). Why the t-distribution is a family of curves. 2  How critical t-values change as a function of the alternative hypothesis and the Type I error rate. 3  How to calculate t-values for a single sample t-test, an independent samples t-test, and a paired t-test.
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515 Area Code 515. At AreaCode.org, you'll find helpful information on the 515 area code, including 515 area code location. Other phone area codes may be found using AreaCode.org's area code locator.Use the search function for area code look up.15 Area Code 515. At AreaCode.org, you'll find helpful information on the 515 area code, including 515 area code location. Other phone area codes may be found using AreaCode.org's area code locator.