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zaharov [31]
3 years ago
8

Using traditional methods, it takes 11.5 hours to receive a basic driving license. A new license training method using Computer

Aided Instruction (CAI) has been proposed. A researcher used the technique with 22 students and observed that they had a mean of 11.7 hours with a standard deviation of 1.4. A level of significance of 0.1 will be used to determine if the technique performs differently than the traditional method. Assume the population distribution is approximately normal. Find the value of the test statistic. Round your answer to three decimal places.
Mathematics
1 answer:
Serhud [2]3 years ago
8 0

Answer: 0.670

Step-by-step explanation:

Given that :

Population mean (μ) = 11.5

Sample size, n = 22

Sample mean, x = 11.7

Standard deviation, s = 1.4

The test statistic ;

Tstat = (x - μ) / (s/√n)

Tstat = (11.7 - 11.5) / (1.4/sqrt(22))

Tstat = 0.2 / 0.2984810

Tstat = 0.6700594

Tstat = 0.670 (3 decimal places )

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Answer:

   (a)  34 ft²

Step-by-step explanation:

The "top" and "back" together have a height of 2 ft + 1 1/2 ft = 3 1/2 ft. The bottom and front will have the same height, so the central vertical rectangle in the net will have a height of 2×(3 1/2 ft) = 7 ft. It is shown as having a width of 4 ft, so its area is ...

  A = WH = (4 ft)(7 ft) = 28 ft²

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The two areas labeled "left" and "right" are shown as having a height of 1 1/2 ft. Their width is the same as the width of the bottom (or top), so is 2 ft. The total area of the left and right sides is then ...

  left + right = 2WH = 2(2 ft)(1 1/2 ft) = 6 ft²

That makes the area of the entire net be ...

  total surface area = 28 ft² +6 ft² = 34 ft²

The surface area of the box is 34 square feet.

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2 years ago
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Step-by-step explanation:

5 0
3 years ago
Oscar says to Vanesa: "I am five times the age you were when I was the age you are; and when you are the age I am, our ages will
Gemiola [76]

Answer:

Vanessa is 60 and the other person is 12

Step-by-step explanation:

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x = 12

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3 years ago
Read 2 more answers
Need Help ASAP. Brent has two barcode printing machines. Each machine can print 25 barcodes per minute. On day 1, only the f
laila [671]
Hello!

As we can see, our first amount was 95 for the one machine. We are not multiplying it by anything from the second day as it was used the first. There is no 95 in B, and in C and D it is multiplied.

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3 years ago
Brian correctly use a method of completing the square to solve the equation X a 2nd plus 7X -11 equals zero Brian‘s first step w
ArbitrLikvidat [17]

Answer:

(\frac{7}{2})^{2}

Step-by-step explanation:

Brain correctly use a method of completing the square to solve the equation:

x^2+7x-11=0

His First Step is to: Take the Constant Term to the Right Hand Side

x^2+7x=11

The Next Step Would be to:

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In this case, the Coefficient of x  = 7

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It is this number (\frac{7}{2})^{2} that is added to both sides in the manner below:

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