Answer:
C.I. = (2.297, 11.703)
Step-by-step explanation:
The t-statistic for difference of mean is given by,
Here, 
= 84
= 7
s₁ = 4
n₁ = 12
s₂ = 6
n₂ = 18
Substituting all value in formula,
We get, t = -3.541 at 28 degree of freedom.
Using this formula, we get, t = 1.5342
Therefore, based on the data provided, the 99% confidence interval for the difference between the population means 
is: 2.297 < < 11.703
which indicates that we are 99% confident that the true difference between population means is contained by the interval (2.297, 11.703)
Answer:
B.0.31
Step-by-step explanation:
% of change = amount of change/original price
R=(P-D)÷P
39-27=12
12÷39=.307
≈.31
The picture is how I solved it and it will be correct
Answer:
answer is 0
Step-by-step explanation:
You can do the equation Y 2x plus 3 on a graph. On this graph the Y would equal 5 and X would equal to 0.
Answer:
n how many ways can a president, vice president, and a secretary be chosen? It is 12X11X10. Permutation of n things taken r at a time: nPr=n!/(n-r)! 12P3=12*11*10*9!/9!= 12*11*10=1320 ways.
Step-by-step explanation:
