(-1+11/2)/2 = 2.25
hope this helps
and this is the correct way to do it
Answer:
Decreasing the sample size decreases the width of the confidence interval.
Step-by-step explanation:
-Let s be the sample standard deviation and
be the sample mean.
#We calculate the 95% confidence interval for the sample size 100 as below:

#we then calculate the confidence interval of sample size =50 and of similar mean and standard deviation:

#Notice that the smaller sample(n=50) has a narrower confidence interval.
Hence, decreasing the sample size decreases the width of the confidence interval.
Answer:
The indifference point is 20 minutes
Step-by-step explanation:
Giving the following information:
Tantasic:
Reservation fee of 20$ and $1 per minute
Bettersun:
2$ per minute.
<u>First, we need to structure both total cost formulas:</u>
Tantasic= 20 + 1x
Bettersun= 2x
x= number of minutes
<u>Now, we equal both formulas and isolate x:</u>
20 + 1x = 2x
20 = 1x
20= x
The indifference point is 20 minutes
A trapezoid has 4 sides. You have everything you need, just add them together. The perimeter of this trapezoid is 40.3 inches or 3.358 feet.
The perimeter of the school crossing sign is 102 inches
length of each side = ?
in the question number of sides is not mentioned, so the answer may vary for the length of each side. if there is 5 sides divide 102 by 5, we get 20.4 answer so in case of 5 sides length of each side is 20.4 inches. if there is 4 sides divide 102 by 4 and we get 25.5 inches answer for the legnth each side.