Estimated Arrival and Price: Watch for the Aventador SV to be unveiled at the Geneva auto show in March before going on sale later in the year as a 2016 model. Prices are unknown, of course, but anything that Lamborghini calls âsuper fastâ is always super expensive. Donât be surprised if the SVâs price eclipses that of the $500,000 50th Anniversary Aventador by at least $100K. View Photos View Photos.
Other differences have to do with nomenclature, notation, and computations. For example, A a measurable characteristic of a population, such as a mean or standard deviation, is called a parameter; but a measurable characteristic of a sample is called a statistic. We will see in future lessons that the mean of a population is denoted by the symbol Î¼; but the mean of a sample is denoted by the symbol x.
Given a sample of size n, consider n independent random variables X1, X2, ..., Xn, each corresponding to one randomly selected observation. Each of these variables has the distribution of the population, with mean and standard deviation . The sample mean is defined to be . By the properties of means and variances of random variables, the mean and variance of the sample mean are the following: Although the mean of the distribution of is identical to the mean of the population distribution, the variance is much smaller for large sample sizes.