2 years ago

3=(1/4)f(-2) How do u solve this

Mathematics

1 answer:

vlabodo [156]2 years ago

8 0

Isolate the variable by dividing each side by factors that don't contain the variable.
Answer: f= -6

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The sample size to obtain the desired margin of error is 160.

Step-by-step explanation:

The Margin of Error is given as

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Now the Margin of Error is reduced by 2 so the new M_2 is given as M/2 so the value of n_2 is calculated as

$n_2=\left[z_{crit}\times \dfrac{\sigma}{M_2}\right]^2\\n_2=\left[z_{crit}\times \dfrac{\sigma}{M/2}\right]^2\\n_2=\left[z_{crit}\times \dfrac{2\sigma}{M}\right]^2\\n_2=2^2\left[z_{crit}\times \dfrac{\sigma}{M}\right]^2\\n_2=4\left[z_{crit}\times \dfrac{\sigma}{M}\right]^2\\n_2=4n$