The answer is 140.07< 140.7 I hope I help
Answer:
The margin of error for the true mean number of hours a teenager spends on their phone is of 0.4 hours a day.
Step-by-step explanation:
We have the standard deviation of the saple, so we use the t-distribution to solve this question.
The first step to solve this problem is finding how many degrees of freedom, we have. This is the sample size subtracted by 1. So
df = 50 - 1 = 49
95% confidence interval
Now, we have to find a value of T, which is found looking at the t table, with 49 degrees of freedom(y-axis) and a confidence level of
. So we have T = 2
The margin of error is:

In which s is the standard deviation of the sample and n is the size of the sample.
The margin of error for the true mean number of hours a teenager spends on their phone is of 0.4 hours a day.
Answer:
30
Step-by-step explanation:
use Pythagoras theorem
hypothenuse of bottom triangle =√24^2+32^2 = 40
x =√50^2-40^2 = 30
Answer:
square root 90 ≈9.486832980505138
Answer:
A. Normal distribution
Step-by-step explanation:
Given that Statistics Canada reports that 13.7% of adult Canadians aged 15 or older report being limited in their daily activities due to a disability.
If you take an SRS of 5000 Canadians aged 15 and over, the approximate distribution of the number in your sample will be the proportion sample would be normal with mean = sample proportion
So answer would be
A. Normal distribution