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
N(228/100)=33.06 multiply both sides by 100
228n=3306 divide both sides by 228
n=14.5
The first answer is C.
The second answer is A.
8+-10=-2 you multiply and combine the variables and numbers.
Answer:
13.42
Step-by-step explanation:
