We cannot calculate the confidence interval without the sample size. However, for the second question, the sample size needed would be 49.
The formula we use is

To find the z-score:
Convert 98% to a decimal: 0.98
Subtract from 1: 1-0.98 = 0.02
Divide by 2: 0.02/2 = 0.01
Subtract from 1: 1-0.01 = 0.99
Using a z-table (http://www.z-table.com) we see that this value is closest to a z-score of 2.33.
Using the z-score, our standard deviation (9) and our margin of error (3), we have:
Answer:
28.5
Step-by-step explanation:
i think itś 28.5 because 285 is after an increase of 10% which would mean 28.5 was the increase
Answer:
4 weeks
Step-by-step explanation:
2 1/4 = 9/4 = 2.25
if it grows 2.25 inches in one week then in two weeks it would have grown 4.5 inches
keep adding the 2.25 inches to 14 until u get 23
:) hope this was heplful
Answer:
x ≤ 0
Step-by-step explanation:
2x² ≤ 0
2x² / 2 ≤ 0 / 2
x² ≤ 0
x²/ x ≤ 0 / x
x ≤ 0