Answer:
a) sample size is 40
Step-by-step explanation:
(a)
minutes
Margin of error, E is 75 seconds E=75/60= 1.25 minutes.
The level of significance
for 95% level of significance
For 95% confidence interval
from standard deviation table
Sample size required, n

Rounding off, n=40
Sample size =40
Keywords:
95% confidence, sample size, Wall Street Journal
What question do you need help with
Answer:
B
Step-by-step explanation:
Because
The standard form of a parabola is

So, if you expand the square, you get

which is the standard form
Answer: plant 1 grows at a faster rate
Step-by-step explanation: