5) 10 pts construct and interpret the indicated confidence interval for the
ditterence between the two population means. assume that the two samples are
independent simple random samples selected from normally distributed
populations. you can use s-pooled, or not pooled by your choice.
a paint manufacturer wanted to compare the drying times of two different
types of paint. independent simple random samples of 11 cans of type a and 9
cans of type b were selected and applied to similar surfaces. the drying times,
in hours, were recorded. the summary statistics are as follows.
type a
*1 = 71.5 hrs
51 = 3.4 hrs
m=11
type b
x2 = 68.5
hrs
s2 = 3.6 hrs
n2=9
construct, and interpret a 99% confidence interval for u1 - 42, the difference
between the mean drying time for paint type a and the mean drying time for
paint type b.
a) -2.24 hrs b) -1.00 hrs c) -0.14 hrs d) -1.51 hrs

answer: a video game has three difficulty levels: easy, medium, and expert. the game's scoring works in such a way that a player has to score a fixed number of points to advance to the next level, and then the scoring starts over. the total score needed to clear all three difficulty levels is 7,500. two times the number of points needed to clear the easy level is 500 more than the number of points needed to clear the medium level. twice the number of points needed to clear the medium difficulty level is 1,500 more than the number of points needed to clear the expert level. if x, y, and z represent the easy, medium, and expert levels, respectively, and a is the coefficient matrix of the system of equations modeling this situation, identify the inverse matrix, a-1, and the solution matrix, x, of the system of equations.

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step-by-step explanation:

1. supplementary angles

2. acd and bcd

step-by-step explanation:

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