Suppose that a researcher is interested in estimating the mean systolic blood pressure, , of executives of major corporations. he plans to use the blood pressures of a random sample of executives of major corporations to estimate . assuming that the standard deviation of the population of systolic blood pressures of executives of major corporations is mm hg, what is the minimum sample size needed for the researcher to be confident that his estimate is within mm hg of ?

solution:

→c= a b , that is product of a and b is possible only when when a is m × n matrix and b is n × p matrix.

that is, number of columns of a= number of rows of b.

so, size of matrix , c= a b is , if a = (m × n)matrix

b= (n × p)matrix

then a b = [ (m × n)matrix] ×[   (n × p)matrix ]

→→c= a b= [m × p ] matrix

→→size of product a b will be equal to = number of rows of a × number of columns of b

answer: my brother can figure it out, imma go get him so i can answer : ) edit: my brother is sleeping, sorry man

step-by-step explanation:

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