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.
On February 13, 1999, it was split again, with area code 661 having been created for the inland areas, which are San Joaquin Valley, Santa Clarita Valley, and Antelope Valley. Area code 805 also serves the US military facilities in Kwajalein, Republic of the Marshall Islands with a Paso Robles prefix (805-355-xxxx).This arrangement originated from the US Army's first satellite communications station having been built at nearby Camp Roberts.he map to the right is now clickable; click on an area code to go to the page for that area code. The area code in red is Area Code 805; all others in blue are California area codes. Area code 805 is a California telephone area code that was split from area code 213 in 1957.