Mapter 9 Jessica Salmeron-Uribe
:)
Due in 3 hours, 46 minutes. Due Tue 08/11/2020 11:59 pm
A school administrator wants to see if there is a difference in the number of students per class for Portland Public School
district (group 1) compared to the Beaverton School district (group 2). Assume the populations are normally distributed
with unequal variances. A random sample of 25 Portland classes found a mean of 38 students per class with a standard
deviation of 2. A random sample of 27 Beaverton classes found a mean of 35 students per class with a standard
deviation of 4.
1)
1)
Find a 99% confidence interval in the difference of the means. Use technology to find the critical value using df -
38.866 and round answers to 4 decimal places.
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f is the midpoint of

d. it is a convex pentagon because it has five sides and none of the sides would extend into the inside of the polygon.

step-by-step explanation:

1. sometimes

2.   never

3   .08c = 7.50+.05c   250 pages

step-by-step explanation:

1.   sometimes

the theoretical probability of rolling a 1 is 1/6.   perhaps you got really lucky and never rolled a 1   in those 60 times.   your experimental probability is 0.   or perhaps you rolled a 1   20 times.   your experimental probability is 20/60 is 1/3.     it really just depends on how you rolled in that experiment.

2.   never

the probability of the event occurring is 1.   that is being 100 % sure it will happen.   that is the maximum amount of confidence we have.

3.   no customer card cost:   .08 times number of pages

customer card cost:   7.50 + .05 times number of pages

we want to find when it costs the same amount, so we will set these equal

let c = number of pages

.08c = 7.50+.05c

subtract .05c from each side

.08c-.05c = 7.5+.05c-.05c

.03c=7.5

divide each side by .03

.03c/.03 = 7.5/03

c =250  

the cost is the same at 250 pages

the one below it is a function