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.
Currently, on the phone with an ATT representative. She has stated that this is not an AT&T number. 805 is central coast of California...San Luis Obisbo... Found info on this number several months ago...805 area code is also an extended area code used for the US Military and Island nations in the Pacific.North American area code 805 is a California telephone area code.Area code 805 includes most or all of the California counties of San Luis Obispo, Santa Barbara, and Ventura, plus southernmost portions of Monterey County. Area code 805 was split from Los Angeles' 213 in 1957.On February 13, 1999, the inland areas (San Joaquin Valley, Santa Clarita Valley, Antelope Valley) of area code 805 split into area code 661.urrently, on the phone with an ATT representative. She has stated that this is not an AT&T number. 805 is central coast of California...San Luis Obisbo... Found info on this number several months ago...805 area code is also an extended area code used for the US Military and Island nations in the Pacific.