Answer:
7.5/5 = 1.5
6/1.5 = 4
X = 4
I'm pretty sure it's right
Answer:
Sample size should be atleast 617
Step-by-step explanation:
given that a 95% confidence interval for the mean of a population is to be constructed and must be accurate to within 0.3 unit.
i.e. margin of error <0.3
Std devition sample = 3.8
For 95% assuming sample size large we can use z critical value
Z critical = 1.96
we have

Sample size should be atleast 617 to get an accurate margin of error 0.3
Step-by-step explanation:
please type the question correctly, it's confusing. thanks
Maria isn't correct of this. Adding these will get you 82960 (You add the numbers) She must have miscalculated.