The variable z is directly proportional to x, and inversely proportional to y. When x is 11 and y is 14, z has the value 7.85714
28571429. What is the value of z when x= 15, and y= 22
1 answer:
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Answer:
2,655 students
Step-by-step explanation:
The z-score for a 99% confidence interval is z = 2.576
The standard error for a proportion p is:
For a proportion of p =0.20, in order to ensure a standard error of 0.02, the sample size 'n' must be:
Rounding up to the next whole student, the sample size needed is 2,655 students.