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.
Entertainment giants and young families equally enjoy living in the 818 area code. Most notably, area code 818 is used for the cities of Burbank and Glendale in California.Celebrities are frequently spotted in both Glendale and Burbank going about their normal lives such as doing grocery shopping or filling up their gas tanks.ost recently, area code 818 was changed a second time in 2008 when the 747 area code overlay was put in place. Currently, callers in the 818 and 747 area codes must dial the area code before the number even when making local calls. Glendale is the suburban part of the 818 area code.