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Please prove the statements shown below:
1. If the elementary matrix E results from performing a certain row operation on an identity matrix Im and if A is an m x n matrix, then the product EA is the matrix that results when this same roe operation is performed on A.
2. Every elementary matrix is invertible, and the inverse is also an elementary matrix.
In a standard test for reaction time, female candidates for flight school are found to have times that are normally distributed with a mean of 0.65 seconds and a standard deviation of 0.15 seconds.
The president of the American Insurance Institute wants to compare the yearly costs of auto insurance offered by two leading companies. He selects a sample of 15 families,some with only a single insured driver
4 7 7 5 2 9 7 6 8 5 8 4 1 5 2 8 7 6 6 9. (a) Determine three quartiles and (b) draw box-and-whisker plot of the data.
using the standard normal table find the proportions for the areas listed belowa. the area between z 0 and z 2.13b.
A survey covering 0 different suburbs in Dallas found the average price of gasoline to be $3.924 per gallon with a population standard deviation of $0.053. What critical value shoiuld be used to test the claim using a = 0.01?
The town clerk, who monitors the voting booths, informed him that all the voters in the entire town registered at a recent election, and 310,000 votes were counted.
The average cost for service provided per person per day is random variable with normal distribution of N$ 100 and a standard deviation of N$ 22. What is the probability that the cost will be at least N$ 127 per day per person.
Death during the next year for a person of your customer's age, sex,health etc is 0.002. What is the expected gain (amount of money made by the company) for policy of this type?
Use the Internet to research the basic lottery system in your state. For example, the state of Ohio has a Pick 5 game where a customer selects 5 single-digit numbers (0-9). Determine the probability of winning your state's lottery game
provide two data setsa. construct a scatterplotb. find the value of the linear correlation coefficient r then determine
How large a sample is needed to estimate the true proportion of home owners who have vegetable gardens to within 0.04 with 98% confidence?
in the major league baseball world series two teams a and b play a sequence of games against each other and the first
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