Question 2 n 2015, the average duration of long-distance telephone calls from a certain town vas 3.9 minutes. A telephone company wants to perform a test to determine whether this average luration of longdistance calls has changed. Fifty calls, originating from the town, vas randomly selected and the Following summary minutes. Σχ-205 Σ (x- x) 2 = 56.43 -) Calculate the sample mean, x. ) Calculate the sample standard deviation ) Using the p value approach at the 1% level of significance, test whether the nean duration of ong-distance calls from the town had increased. ) Construct the 99% confidence interval for the population mean duration of the ong-distance calls from the town.

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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.