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.
The 805 Area Code (or Area Code 805) is located in the state of CA. Area Code 805 is one of the 269 3-digit telephone area codes in the USA.ry searching for any 805 Area Code phone number today, and discover what Spokeo can do for you. Top Cities. Oxnard, Arroyo Grande, Cambria, Simi Valley, Ventura, Thousand Oaks, Paso Robles, Newbury Park, San Luis Obispo and Guadalupe.
Locations For Telephone Prefix 805. This page (and others like it) shows the area codes and states / provinces / territories / countries for a specific prefix. In AAA-PPP-NNNN the PPP is the prefix (the AAA is the area code).To find the exact city location for any prefix, please use our search engine HERE.his page (and others like it) shows the area codes and states / provinces / territories / countries for a specific prefix. In AAA-PPP-NNNN the PPP is the prefix (the AAA is the area code). To find the exact city location for any prefix, please use our search engine HERE.