Answer:
(-3, -4)
Step-by-step explanation:
i guessed on acellus and got it right
Answer:
6y^-1
Step-by-step explanation:
I had this question on Khan Academy
The second sentence doesnt really make sense to me, it sounds incomplete but, I may be wrong. His total not including whatever it says in the second sentence is $64. I hope this may help a little bit.
Answer:
The 95% confidence interval for the population mean height of males of this country is between 67.136 inches and 74.864 inches.
Step-by-step explanation:
For the country, we only have the standard deviation of the sample, so we use the t distribution to build the confidence interval.
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 = 45 - 1 = 44
Now, we have to find a value of T, which is found looking at the t table, with 44 degrees of freedom(y-axis) and a confidence level of 0.95(). So we have T = 1.68
The margin of error is:
M = T*s = 1.68*2.3 = 3.864
In which s is the standard deviation of the sample. So
The lower end of the interval is the sample mean subtracted by M. So it is 71 - 3.864 = 67.136 inches
The upper end of the interval is the sample mean added to M. So it is 71 + 3.864 = 74.864 inches
The 95% confidence interval for the population mean height of males of this country is between 67.136 inches and 74.864 inches.