ࡱ> y m-bjbjEE ''#@@33333!!!!0b0b0b<>>>>>>U>0b^0b0b0b>!!<S8g8g8g0b6!(!<8g0b<8g8gf!3bH"(i0>fύ0dύDύ0b0b8g0b0b0b0b0b>>g40b0b0b0b0b0b0bύ0b0b0b0b0b0b0b0b0b@ I: Sample Mean Samples give information about random variables X - Random variable Sample size -n  Expected value of the sample mean  Expected value of the sample variance Here  EMBED Equation.3  and s2 are sample statistic, used to estimate the expected value of sample mean & expected value of the sample variance ============================================================= Justification (Extra) In the world of business applications, we usually must gather information about a random variable, X, by collecting a single random sample {x1, x2, (, xn}. The sample size, n, may be too small to provide much information about the distribution of X. Hence, we must learn what we can from the two sample statistics  EMBED Equation.3  and s2. We know that the expected value of the sample mean is E(X) and that the expected value of the sample variance is V(X). Thus, we can estimate the two main parameters of X, E(X) (  EMBED Equation.3  and V(X) ( s2. As we have seen in our examples, interest is usually centered on E(X). This is the number that will influence our business decisions. For this reason, we need information on how accurately  EMBED Equation.3  approximates E(X). This, in turn, means that we must know something about the probability distribution of the sample mean, taken as a new random variable. As we saw in Variance, the Variance of the sample mean is =V(X)/n ( s2/n. But V(X) ( s2  EMBED Equation.3  Taking the expected value of the sample mean to be approximately  EMBED Equation.3  , we have estimates for both the mean and the variance of the sample mean. Unfortunately, we have also seen that the mean and variance of a random variable do not determine its probability distribution. As the sample size, n, increases, the distributions of the standardized sample means of any random variable always approach the same fixed probability distribution function. We let Z be the continuous random variable whose probability is given by this universal distribution function. Z is called the standard normal random variable and fZ is called the standard normal probability density function. The Central Limit Theorem If X is any random variable, then, as n increases without bound, the distribution of its standardized sample mean,  approaches the distribution of the standard normal random variable, Z, whose p.d.f. is  The graph of the standardized values appear to be approximately as follows Extra ( Good News. We need to learn about only one density in order to approximate probabilities for the sample mean of any random variable. In fact, the sample size does not have to be very large in order for this to be a quite good approximation. A sample size of 30 or more is usually adequate. ( Bad News. We have pictures and a small amount of numerical data for two close approximations of fZ, but we have no usable formula for this universal density. fZ is a function of major importance, occurring in almost all sampling problems and in a large number of other business applications. (The discovery of a formula for fZ is well worth our attention. The first step is to produce very good numerical and graphical approximations for fZ.) Since we know that the distribution for the standardized sample mean of any random variable approaches the distribution of Z, we can abandon random sampling and compute actual probabilities for one particular standardized sample mean. Exercise 7 X can assume only the values of 0 and 1, with  EMBED Equation.3  and  EMBED Equation.3 . Use BINOMDIST to compute the values of the p.m.f. for  EMBED Equation.3 , with sample size  EMBED Equation.3 . Hint: There are five possible values of  EMBED Equation.3 . Sample space =========== {(0000), (0001), (0010), (0011), (0100), (0101), (0110), (0111), (1000), (1001), (1010), (1011), (1100), (1101), (1110), (1111)} B is the finite random variable that counts the number of 1s. B can assume 0,1,2,3,4 { using  EMBED Equation.3 } Solution. We can use BINOMDIST in Excel to show that P(B = 0) = 0.0625, P(B = 1) = 0.25, and P(B = 2) = 0.375. P(B = 3) = 0.25, P(B = 4) = 0.0625 b EMBED Equation.3 =b/4(4 is the sample size) EMBED Equation.3 = EMBED Equation.3 00.000.062510.250.250020.500.375030.750.250041.000.0625Exercise 8 Let X be as in Exercise 7, and let  EMBED Equation.3  be the standardization of the sample mean for X, with sample sizes of  EMBED Equation.3 . (i) Compute the mean and standard deviation of  EMBED Equation.3 . (ii) Compute all values for the p.m.f. of  EMBED Equation.3 . (iii) Compute the mean and standard deviation of  EMBED Equation.3 . Solution.  EMBED Equation.3  EMBED Equation.3  EMBED Equation.3  EMBED Equation.3 0.000.06250.00000.0156250.250.25000.06250.0156250.500.37500.18750.0000000.750.25000.18750.0156251.000.06250.06250.015625Sum1.000 EMBED Equation.3 0.5000 EMBED Equation.3 0.0625 EMBED Equation.3 0.2500 (i) So, the mean is 0.5, variance is 0.0625, and standard deviation is 0.25 Using  EMBED Equation.3  EMBED Equation.3  EMBED Equation.3  EMBED Equation.3 0.0625-10.250000.375010.250020.0625 (ii)  EMBED Equation.3  EMBED Equation.3  EMBED Equation.3  EMBED Equation.3 -20.0625-0.1250.25-10.2500-0.2500.2500.37500.0000.0010.25000.1250.2520.06250.2500.25Sum1.000 EMBED Equation.3 0 EMBED Equation.3 1.00 EMBED Equation.3 1.00(iii) So, the mean is 0 and the standard deviation is 1. (This MUST be true for all standardized variables) Additional notes (Background Information) The Normal Distribution Most frequently used distribution because seems to describe many phenomena has nice mathematical properties many distributions are approximated by it if n is large Characteristics bell-shaped and symmetrical-- 50% below the mean, 50% above (mean = median = mode) defined by ( and ( ( these determine the position and dispersion of the distribution, respectively probability density function (tells you height of the curve): -- doesnt tell you the area under the curve (probability) to find actual probability between two points could integrate function and solve over interval (but this is too cumbersome)-For MATH 115B-we use integrating excel. Z score (a.k.a., standardized score) translates raw scores into a standardized score by averaging out mean and standard deviation Thus, it is nothing more than a relabelling method Note that standardizing isnt the same as normalizinggetting standard scores (or z scores) does not change the shape of the distribution but simply puts most of the values roughly onto a +3 to -3 scale (although, values can be much smaller or larger, most are in this range) mean = 0, sd = 1 for all distributions, doesnt have to be symmetric or normal ( but if the distribution isnt normal then you cant use normal table to find probabilities  EMBED Equation.2 ( scores centered around mean, averaged by s; z score = relative position of raw score in distribution can get z scores by using Excels function wizard, selecting statistical functions, and using STANDARDIZE. A lot of information in just one statistic sign of z score indicates if value is above or below mean magnitude of z score tells where in the distribution the value is For any mound shaped, symmetric distribution  Example-- Whos performing better in sales? Bill = $10,000 sales in Region 1 or Janice = $5,000 sales in Region 2 Need to consider their relative standings in their regions-- maybe its harder to sell in Region 2 than 1 compare their z scores z scores especially useful when comparing apples and oranges e.g. job candidates scores on a written test with a 0-100 range and a performance test with a 1-10 range z scores not useful when you need to know the raw values Are sales quotas being met? How much profit was made last year? We will use z-scores mainly to use with the normal probability table and not as a statistic in itself On a recent exam, the scores were normally distributed with mean 50 and standard deviation 12.5 What is the probability that a randomly selected student would get at least the average? What is the probability that a randomly selected student would get between 50 and 75? What score did only 16% of the students meet or exceed?  normal table. Translate raw score into z score and then find the probability. This means we only have to have one table for an infinite number of normal distributions because we force the mean = 0 and sd = 1. 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