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finlep [7]
2 years ago
7

Exhibit 10-7 In order to estimate the difference between the average hourly wages of employees of two branches of a department s

tore, two independent random samples were selected and the following statistics were calculated. Downtown Store North Mall Store Sample size 25 20 Sample mean $9 $8 Sample standard deviation $2 $1 Refer to Exhibit 10-7. A 95% interval estimate for the difference between the two population means is _____. Selected Answer: b. .071 to 1.928
Mathematics
1 answer:
Leokris [45]2 years ago
8 0

Answer:

E(x)=1

Step-by-step explanation:

From the question we are told that:

Sample mean 1 \=x_1=$9

Sample mean 1 \=x_2=$8

Sample standard deviation 1 \sigma_1 = $2

Sample standard deviation 1 \sigma_2 = $1

Generally the equation for Point estimate is mathematically given by

E(x)=\=x_1-\=x_2

E(x)=9-8

E(x)=1

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Solve the quadratic equations
Alexxx [7]

Answer:

for quadratic equation 1

y^2-10y+21=0

Step-by-step explanation:

y^2-7y-3y+21=0

y(y-7)-3(y-7)=0

(y-7)(y-3)=0

y-7=0,y-3=0

y=7,y=3

y=(3,7)

for quadratic equation 2

16p^2-8p+1=0

16p^2-4p-4p+1=0

4p(4p-1)-1(4p-1)=0

(4p-1)twice=0

4p-1=0,4p-1=0

4p=1

p=1/4 twice

for quadratic equation 3

x^2-400=0

x^2=400

x=√400

x=20

for quadratic equation 4

-16m^2-8m-1=0

multiply the equation by -

16m^2+8m+1=0

16m^2+4m+4m+1=0

4m(4m+1)1(4m+1)=0

4m+1=0 twice

m=-1/4 twice

for quadratic equation 5

-3n^2+75=0

divide both side by -3

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n^2=25

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6 0
2 years ago
PLEASE SHOW YOUR WORK
lakkis [162]

Answer:

ok

Step-by-step explanation:

5 0
3 years ago
How does the graph of y=-3√2x-4 compare to the graph of y=-3√x-4?
kifflom [539]
<span>Assuming the graph is y=-3(√2x)-4 and y=-3√(x-4) the transformation would be:

</span><span>The graph is compressed horizontally by a factor of 2
x=1/2x'
</span>y=-3(√2x)-4 
y=-3(√x')-4 <span>

</span><span>moved left 4
x=x'-4
</span>y=-3(√x)-4 
y=-3(√x'-4)-4 
<span>
moved down 4
y=y'-4
</span>y=-3(√x-4)-4 
y'-4=-3(√x'-4)-4 
y'=-3(√x'-4)-4 +4
y'=-3(√x'-4)

Answer: C. <span>The graph is compressed horizontally by a factor of 2, moved left 4, and moved down 4.
</span>
6 0
3 years ago
Read 2 more answers
Kinda left explainitory but I need help with finding the base ​
almond37 [142]

Answer:

6.4 cm

Step-by-step explanation:

Area of triangle = 17.28 cm²

\frac{1}{2}*base *altitude = 17.28\\\\\frac{1}{2}*base*5.4=17.28\\\\base = 17.28*\frac{2}{5.4}\\\\base= 3.2*2\\\\base = 6.4 cm

5 0
2 years ago
Write in terms of i.<br> Simplify your answer as much as possible.<br> -8
Goryan [66]

Answer:

In order to begin figuring that out, we need to know about the equation.

3 0
2 years ago
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