Answer: Option 'd' is correct.
Step-by-step explanation:
Since we have given that
Margin of error = 0.5 years
Standard deviation = 5
At 90% confidence, z = 1.645
We need to find the minimum size of the sample they must take.
So,

Hence, Option 'd' is correct.
round to 13 since you round down.
so the answer is 13
Answer:
the answer is b there tend to e more in brand x but less to constant then brand y
Step-by-step explanation:
N=350 is the answer to the question
0.44 / (0.06 + 0.09) = 0.44 / 0.15 = 2.93....about 3 hrs