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klio [65]
3 years ago
12

In order to estimate the difference between the average hourly wages of employees of two branches of a department store, the fol

lowing data have been gathered. Downtown StoreNorth Mall Store Sample size2520 Sample mean$12$6 Sample standard deviation$3$1 The point estimate for the difference between the two population means is 6. Find a 95% interval estimate for the difference between the two population means. 0.654 to 2.615 3.958 to 8.042 4.692 to 7.308 5.699 to 8.301
Mathematics
1 answer:
Vinil7 [7]3 years ago
3 0

Answer:

4.692 to 7.308

Step-by-step explanation:

Given :

n1 = 25 ; n2 = 20 ;

Mean x1 = $12 ; mean x2 = $6

Standard deviation, s1 = 3 ; s2 = 1

Confidence interval :

(x1 - x2) ± t*√(s1²/n1) + (s2²/n2)

x1 - x2 = (12 - 6) = 6

√(s1²/n1) + (s2²/n2) = √(3²/25) + (1²/20) = 0.640

Degree of freedom :

((s1²/n1) + (s2²/n2))² / (s1²/n1)²/n1-1 + (s2²/n2)²/n2-1

Numerator = 0.1681

Denominator = 0.0054 + 0.0001315 = 0.0055315

Degree of freedom = 0.1681 / 0.0055315 = 30.38 = 30

Tcritical at 0.05, df = 30 = 2.042272

Hence ;

6 ± 2.042272(0.640)

6 ± 1.30705408

Lower boundary = 6 - 1.30705408 = 4.69294592

Upper boundary = 6 + 1.30705408 = 7.30705408

(4.693 ; 7.307)

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Please help!!! <br> And try to show your work if you can:)
maxonik [38]

Answer:

equation~ 2x + 5= 2X + 8

Value of X~ 0.3

Perimeter:13

Step-by-step explanation:

equation: 2x + 5 =2x +8

 2x + 5= 2x+ 8              

 4x + 5= 8

   4X= 13

x= 0.3

value of X: 0.3

Perimeter: 13

8 0
3 years ago
Darius is saving money to go to a gaming summer camp. He already has $95 in the bank. His goal is to earn $900 so he can pay for
ruslelena [56]

Answer:

<em>95+35x=900</em>

<em>23 weeks</em>

<em>$48 per week</em>

<u>I would recommend looking at work, it will help the answers make more sense.</u>

Step-by-step explanation:

Starting with the equation. You can see that he makes 35 dollars per week he works. Since we don't know the amount of time he works, we can use a variable. I'm going to use x. Since Darius already has $95 in his bank account, we need to make sure to include this money into the trip. So, the equation would look something like this. 95+35x=900

Let's find out how many weeks it will take Darius to reach his goal $900. First we need to subtract 95 from both sides. So, 95-95, which will cancel out, and you should be left with 35x=900-95. Now, 900-95. If you aren't good with subtracting, round 95 to 100. Now you get 800, make sure to add back the five. You should result in 805. So you are left with getting x alone.

35x=805

Divide each side by 35, so we can get x alone. 35 divided by 35 will cancel out, since it equals one. One is assumed, so you can just put x. Now it's time to divide 805 by 35. You should get 23. So that's your answer. It should take 23 weeks before Darius can pay to go to summer camp.

Since Darius wants to complete his goal six weeks earlier, he would need to be payed a different amount. The amount in his bank account won't change, nor will the amount of what we need to pay for this summer camp. So, let's rewrite the equation.

95+48x=900

Since it doesn't end up being a whole number when dividing, you can see that he might end up with extra change.

Solve like before and you should get 17. Which to check, you will see that 23-6=17.

95-95+48x=900-95

48x=805

48(17)=816

Add 95 to 816

911

Darius will not only meet his goal, but will also have extra money left over.

So, Darius needs to earn $48 per week.

4 0
3 years ago
Car price $118,191
Alik [6]

Answer:

3410.64

Step-by-step explanation:

Gonna assume that the 2.49 is the APR

present value of the loan= present value of the payments

effective rate: .0249/12= .002075

x= payment

118191=x\frac{1-(1+.002075)^{-36}}{.002075}\\118191=34.6536494355x\\x=3410.63645317

8 0
3 years ago
Brandon bought 14 2/5 pounds of clay to build a volcano for his science project. He used 10 1/2 pounds of clay on his project. H
Nostrana [21]

Answer:

3 9/10 or 3.9 as decimal

Step-by-step explanation:

just subtract

6 0
3 years ago
Read 2 more answers
Look at the number pattern shown below:3 × 17 = 5133 × 167 = 5511333 × 1667 = 555111What will be 33333 × 166667?
dolphi86 [110]

Answer:

33333 x 166667 = 5555511111

I think that is the answer you wanted

Step-by-step explanation:

      166667

     x 33333

<u>5555511111 </u>

5 0
4 years ago
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