Answer:
Step-by-step explanation:
Given that
Population mean
std deviation = 12
sample size n =36
Sample mean =
(Two tailed test)
Mean difference = 7
Std error =
Since population std dev is known and n>30 we use Z test
Z statistic =
p value <0.001
Since p value is <0.01, at 1% significance level, we reject H0.
There is significant difference between sample mean and population mean.
Answer:
126 inches
Step-by-step explanation:
C = 2π·r = π·d = 3.14×40in = 125.6 inches ≈ 126 inches
The absolute error is 0.2 and the percent error is 1.45 I hope this helps