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densk [106]
2 years ago
12

Using traditional methods, it takes 103 hours to receive a basic driving license. A new license training method using Computer A

ided Instruction (CAI) has been proposed. A researcher used the technique with 60 students and observed that they had a mean of 102 hours. Assume the variance is known to be 9. A level of significance of 0.01 will be used to determine if the technique performs differently than the traditional method. Find the value of the test statistic. Round your answer to 2 decimal places. Enter the value of the test statistic.
Mathematics
1 answer:
velikii [3]2 years ago
7 0

The test statistic based on the probability illustrated is -2.57.

<h3>How to calculate the probability?</h3>

The basic training is given as 103 hours. The variance is also given as 9.

The test statistic will be:

= (102 - 104/3/✓60)

= -1/(3/7.7)

= -2.57.

Learn more about probability on:

brainly.com/question/24756209

#SPJ1

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A cake has circumference of 25 1/7 inches. What is the area of the cake? Use 22/7 to approximate π. Round to the nearest hundred
choli [55]

Answer:

50.29 in^2

Step-by-step explanation:

From the circumference we need to find the radius.

Since C = 2*pi*r, r = C / (2*pi).

Here, with C = 25  1/7 in, r = (25  1/7 in) / [ 2(22/7) ], or r = 4 in

The area of the cake is A = pi*r^2, or (here)  A = (22/7)(4 in)^2 = 50.29 in^2

5 0
3 years ago
The owner of a chain of 12 restaurants wants to conduct a survey to determine whether his employees are properly informed by the
goldenfox [79]

Answer: non random and biased. Random and un biased

Step-by-step explanation:

Just answered it

8 0
3 years ago
The sum of a number and two equal to negative seven. Translate this sentence to an equation and then find the number
Anvisha [2.4K]

Answer:

-9

Step-by-step explanation:

x+2=-7

x+2-2=-7-2

x=-9

6 0
3 years ago
Solve.<br> 20 -5r = 20 - 57<br> A. 1<br> B. 5<br> C no solution<br> D. all real numbers<br> o
trapecia [35]
The answer is 11.4... so I’m not 110% because of your answer choose
4 0
3 years ago
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Each figure shows a pair of similar triangles, one contained in the other.
Alecsey [184]

Dilation involves enlarging or reducing the size of a shape.

The scale factor of dilation is 1/6

From the complete question, the side lengths of corresponding sides of both triangles are:

AC =18cm

AC' =3cm

This means that, the larger triangle is ABC, while the smaller triangle is AB'C'.

So, the scale factor of dilation from the larger triangle to the smaller triangle is:

k = \frac{AC'}{AC}

This gives

k = \frac{3cm}{18cm}

Remove the common units

k = \frac{3}{18}

Reduce fraction

k = \frac 16

Hence, the scale factor of dilation is 1/6

Read more about dilation at:

brainly.com/question/3457976

7 0
3 years ago
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