Answer:
the mean of the population is?
b. significantly greater than 3.
Step-by-step explanation:
Given that the manager of an online shop wants to determine whether the mean length of calling time of its customers is significantly more than 3 minutes
H0: ![\bar x = 3\\](https://tex.z-dn.net/?f=%5Cbar%20x%20%3D%203%5C%5C)
H1: ![\bar x >3\\](https://tex.z-dn.net/?f=%5Cbar%20x%20%3E3%5C%5C)
(Right tailed test for checking mean)
n = Sample size = 100
Sample mean = 3.1
s = Sample std dev = 0.5
Std error of mean = ![\frac{s}{\sqrt{n} } \\=0.05](https://tex.z-dn.net/?f=%5Cfrac%7Bs%7D%7B%5Csqrt%7Bn%7D%20%7D%20%5C%5C%3D0.05)
Mean difference = 0.10
Since only sample std dev is used, we can use t test only
t = mean diff/std error = ![\frac{0.1}{0.05} \\=2](https://tex.z-dn.net/?f=%5Cfrac%7B0.1%7D%7B0.05%7D%20%5C%5C%3D2)
df = 99
p value = 0.02412
Since p < 0.05 our significant level, we reject null hypothesis
The conclusion is
the mean of the population is?
b. significantly greater than 3.
The answer is y=-3/4x+5/4
Explanation:
First find the slope 2-(-4)/-1-7 which simplified equals to -3/4. Then use one of the coordinates to find y-intercept
N < 9 +- 3
N is less than 9 plus/minus 3
Answer:
21.62m
Step-by-step explanation:
first draw the the pipe
second you need know wich is the angle between the pipe and the corner
β=Tan^-1(6/9)=33.7
find the components using tow triangles
a=9/cos(33.7)=10.81m
b=6/sen(33.7)=10.81m
finally sum the leghts
L=10.81+10.81=21.62mm
attached procedure
Answer:
0.70L
Step-by-step explanation:
3m=2b
convert 8 b to mugs
therefore 8b=12m
12m+10m=22m
15.4/22=0.700l