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.
The map to the right is clickable; click on an area code to go to the page for that area code. The area code in red is Area Code 310; all others in blue are California area codes. Area code 310 is a California telephone area code that was split from area code 213 on November 2, 1991.Area code 424 is an overlay of 310 that became effective on July 26, 2006.It is the area code that covers West Los Angeles and South Bay areas of Los Angeles County, including Santa Catalina Island (located 26 miles (42 km) south of the mainland portion of Los Angeles County).rea code 424 is an overlay of 310 that became effective on July 26, 2006. It is the area code that covers West Los Angeles and South Bay areas of Los Angeles County, including Santa Catalina Island (located 26 miles (42 km) south of the mainland portion of Los Angeles County).