Asample of households in a community is selected at random from the telephone directory. in this community, 2% of households have no telephone, 14% have only cell phones, and another 25% have unlisted telephone numbers. the sample will certainly suffer from
a. nonresponse.
b. false responses.
c. undercoverage.
d. none of the above.

under coverage

Step-by-step explanation:

From the given information we can say that 2% of households have no telephone, 14% have only cell phones, and another 25% have unlisted telephone numbers. Since, the facility is available some part of population and not available to the whole population so, clearly its an examples under coverage.

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step-by-step explanation:

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option (b) is correct

step-by-step explanation:

to find the solution of this system, we need to convert it into reduced row-echelon form. we have,

after applying row operations r2 -> r2/2 and r3 -> r3/3, we get,