26. Bob draws a simple random sample from an original population. The sample size is n = 41, the sample mean turns out to be = 130, and the sample standard deviation turns out to be s = 6. Find the 99% confidence interval for the population mean H. А. (125.47, 130.53) В. (126.47, 131.53) С. (127.47, 132.53) D. (128.47, 133.53) 27. Bob draws a simple random sample from an original population. The sample size is n = 61, the sample mean turns out to be = 59, and the sample standard deviation turns out to be s = 4. Find a 95% confidence interval for the population mean µ. A. (57.976, 60.024) В. (56.253, 59.757) С. (58.005, 61.417) D. (58.452, 59.661)

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Matrices

‘Matrices’ is the plural form of the word matrix, and it is basically a spreadsheet in the form of a box. In mathematics, various functions can be carried out with matrices. Generally, a matrix comes in the shape of a square or rectangle. The elements are distributed horizontally in the form of rows, and vertically in the form of columns.