Identify which type of sampling is used
50, 33, and 48 students are selected from the Sophomore, Junior, and Senior classes with 496, 348, and 481 students respectively. Identify which type of sampling is used and why?
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The mean score for freshmen on an aptitude test at a certain college is 540, with a standard deviation of 50. What is the probability that two groups of students selected at random, consisting of 32 and 50 students, respectively, will differ in th
The mean and standard deviation of the sampling distribution of X; The number of sample means that fall between 172.5 and 175.8 centimeters inclusive; The number of sample means falling below 172.0 centimeters.
A box in a certain supply room contains four 40-W lightbulbs, three 60-W bulbs, and six 75-W bulbs. What is the probability that exactly two of the selected bulbs are rated 75-W?
Calculate the sample mean, sample variance, and standard deviation. Find the median. How much could the largest temperature measurement increase without changing the median value?
The following data are direct solar intensity measurements (watts/m2) on different days at a location in southern Spain: 562, 869, 708, 775, 775, 704, 809, 856, 655, 806, 878, 909, 918, 558, 768, 870, 918, 940, 946, 661, 820, 898, 935, 952, 957,
The demand values for the 12 months of 2006 for one electrical fixture are presented in Table below. Use exponential smoothing with a smoothing constant of .5 and an initial value of 205 to forecast the demand for January 2007.
Use exponential smoothing with a smoothing constant of .2 and an initial value of 9.29 to forecast the yield for January 2007.
The Hughes Supply Company uses an inventory management method to determine the monthly demands for various products.
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