I=$26.25I=$26.25, P=$500P=$500, t=18 t=18 months
2 answers:
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Answer:
The sample needed is
Step-by-step explanation:
From the question we are told that
The margin of error is
The confidence level is
Given that the confidence level is 95% the level of significance is mathematically represented as
Next we obtain the critical value of from the z-table , the value is
The reason we are obtaining critical value of instead of
is because
represents the area under the normal curve where the confidence level interval (
) did not cover which include both the left and right tail while
is just the area of one tail which what we required to calculate the margin of error
The sample size is mathematically represented as
Here is sample proportion of people that supported her and we will assume this to be 50% = 0.5
So