Using traditional methods it takes 99 hours to receive an advanced driving license. A new training technique using Computer Aided Instruction (CAI) has been proposed. A researcher used the technique on 190 students and observed that they had a mean of 98 hours. Assume the population variance is known to be 49. Is there evidence at the 0.05 level that the technique reduces the training time?
State the null and alternative hypotheses.
Find the value of the test statistic. Round your answer to two decimal places

Answers

Answer 1

Answer:

the aswer is 0.40 hope this helps

Step-by-step explanation:


Related Questions

Determine the equation of the circle graphed below.

Answers

Step-by-step explanation:

radius= √(2+2)²+(0+3)²=√4²+3²=√16+9

=√25=5

the equation is

(x+2)²+(y+3)²=25

or

x²+y²+4x+6y-12 = 0

uwuwhwhwuwuwuwuwuwiwuuwuwiwiw

DNA contains the genetic code of an organism. The length of a DNA strand is about 10-7 meter. Which of the following represents the length of the DNA strand as a decimal?​

Answers

Step-by-step explanation:

Write each decimal using a negative exponent. ... DNA contains the genetic code of an organism. ... meter. Which of the following represents the length of the DNA strand as a decimal?

atlas isttg dont ttake this down its a question and u have no right to

Answers

Answer:

13/16

Step-by-step explanation:

-2x^2+6x+1=-3x^2 solve to the nearest tenth

Answers

Step-by-step explanation:

The given equation is :

[tex]-2x^2+6x+1=-3x^2[/tex]

Taking all the terms to one side of the equation i.e.

[tex]-2x^2+6x+1+3x^2=0\\\\x^2+6x+1=0[/tex]

It is a quadratic equation of the form [tex]ax^2+bx+c=0[/tex] whose solution is given by :

[tex]x=\dfrac{-b\pm \sqrt{b^2-4ac}}{2a}[/tex]

Here, a = 1, b = 6 and c = 1

Put all the values,

[tex]x=\dfrac{-6\pm \sqrt{6^2-4(1)(1)}}{2(1)}\\\\x=-0.171\ and\ x=-5.82[/tex]

Hence, this is the required solution.

(help) what type of triangle is shown below

Answers

pretty sure it’s obtuse !

Luigi ha 2 figli di 15 e 11 anni. Fra 18 anni la sua età sarà uguale alla somma delle età che avranno i figli. Quanti anni ha oggi Luigi?​

Answers

Answer:

please if you need help, type in English, thanks :)

work out the area of this circle. take pi to be 3.142 and give your answer to be 2 decimal places. 11,2 cm

Answers

Answer:

11.2 i think so but you will write 11.2

A right triangle (90) has a one angle that measures 35 degrees. What is the measure of the third angle?

A. 90 degrees
B. 145 degrees
C. 55 degrees
D. 180 degrees

Answers

Answer:

55°

Step-by-step explanation:

triangle= 180°

third angle= 180-90-35

= 55°

what is the area of this figure

Answers

Answer:

A=162.56in^2

Step-by-step explanation:

make sure u separate the different shapes

Please help!!! Here’s a picture of my question

Answers

Answer:

option no. D

Step-by-step explanation:

i+34j+14k

hope it helps

Solve for (0,2π]
2cos ß * sin ß = cos ß

Answers

Given :

An equation, 2cos ß sin ß = cos ß .

To Find :

The value for above equation in (0, 2π ] .

Solution :

Now, 2cos ß sin ß = cos ß

2 sin ß = 1

sin ß = 1/2

We know, sin ß = sin (π/6)  or sin ß = sin (5π/6) in  ( 0, 2π ] .

Therefore,

[tex]\beta = \dfrac{\pi}{6}\ or\ \beta = \dfrac{5\pi}{6}[/tex]

Hence, this is the required solution.

what is the perimeter of this given figure

pahelp po. thank you​

Answers

Answer:

14 units

Step-by-step explanation:

Side length of each square is 1 unit.

So, sum of the lengths of all the border edges = 14 units

Thus, the Perimeter of the figure = 14 units

Hopes this helps:

Answer: 14

Please help me out I don’t understand this.

Answers

The area (A) of a trapezoid is calculated as follows:

A = 1/2 * sum of the parallel sides * height

In this case:

A = 1/2 * (23 + 5) * 12 = 168 yd^2.

Answer: it’s 168

Step-by-step explanation:

HELPPP HELPPP HELPPP!!!!

Answers

Answer:

Step-by-step explanation:

area =8*4 cm

=32 cm^2

Answer:

area of the figure=8×4

=32 cm²

halps pleasessssssssss

Answers

Answer:

SAS. ( side, angle, side)

in option 2nd

Answer:

False

SAS = This stands for Side Angle Side congruency theorem

Step-by-step explanation:

Question 1.)

If any of the 2 angles of any triangle is congruent to any of the 2 angles of the other triangle, then this would be true. Let's find the measure of ∠R and ∠G:

=> ∠G = 180 - (98 + 30)

∠G = 52

=> ∠R = 180 - (98 + 26)

∠R = 56

Now we know that Angles of ΔHIG are 30, 98, and 52, and Angles of ΔSQR are 26, 98, and 56. 2 angles of 1 triangle are not congruent 2 angles of the other triangle, therefore the triangles aren't congruent.

Question 2.)

SAS congruency is used since an angle and it's 2 adjacent sides are given for each triangle.

Hope this helps!

The perimeter of the
rectangle is 14 m and
the area is 12 m2.
Calculate the length
of the rectangle
diagonal​

Answers

Answer:

5

Step-by-step explanation:

area of rectangle = l(ength)×w(idth)

perimeter = 2×l + 2×w

diagonal = sqrt(l² + w²) (Pythagoras)

l×w = 12. => l = 12/w

2×l + 2×w = 14

2×12/w + 2×w =14

12/w + w = 7

12 + w² = 7w

w² - 7w + 12 = 0

=> (after a little thinking and trying : what 2 numbers multiply to 12 and add to -7 ? -3 and -4

=> (w-3)×(w-4) = 0

so, we get 2 solutions for w : 3 and 4

that gives us 2 solutions for l : 4 and 3

so, one is 3 and the other 4. it does not matter which is which. length 4 and width 3 produce the same diagonal as length 3 and width 4.

diagonal = sqrt(l² + w²) = sqrt(16 +9) = sqrt(25) = 5

g A radio station’s poll found that 68% of the respondents in a random sample of listeners plan to see a live music show in the next month. A 95% confidence interval for the population proportion was 0.68 ± 0.04. What is the correct interpretation of the 95% confidence interval? We can be 95% confident that 68% of all listeners will see a live music show in the next month. There is a 95% probability that between 64% and 72% of the listeners will see a live music show in the next month. There is a 5% chance that less than 64% or more than 72% of listeners will see a live music show in the next month. We can be 95% confident that the true proportion of listeners who will see a live music show in the next month is between 64% and 72%. If we repeatedly took samples of the same size from listeners of this radio station, approximately 95% of those samples would have between 64% and 72% of the sample going to see a live music show in the next month.

Answers

Answer:

We can be 95% confident that the true proportion of listeners who will see a live music show in the next month is between 64% and 72%.

Step-by-step explanation:

x% confidence interval:

A confidence interval is built from a sample, has bounds a and b, and has a confidence level of x%. It means that we are x% confident that the population mean is between a and b.

A 95% confidence interval for the population proportion was 0.68 ± 0.04.

We are 95% sure that the true population proportion is between 0.68 - 0.04 = 0.64 and 0.68 + 0.04 = 0.72.

Thus, the correct answer is:

We can be 95% confident that the true proportion of listeners who will see a live music show in the next month is between 64% and 72%.

A person of interest was identified by the police. Using three different telecommunication towers,
the police were able to gather the following information about the person's cell phone location.
• The person is 7 miles away from A(4,4.6).
• The person is 5 miles away from B(-3.5, - 3.8).
• The person is 6 miles away from C(-6, 5.5).
Use the information from towers A, B, and C to find the approximate location of the person of
interest.

Answers

Answer:

Well since he tracked the person through the communication towers he was able to gather information, with this information we can solve and find out how far this person is.

Step-by-step explanation: read above and trust

please give answer would be cool
+

Answers

Step-by-step explanation:

38 to 18 m square / videos 400

In a dark room, the pupil of a human eye grows to a diameter of about 3.2 x 10 inches. It
bright light, the pupil shrinks to a diameter of about 8 x 10 inches. How much greater is
the pupil's diameter in a dark room than in bright light?

Answers

Answer: the answer is 48 inches

Step-by-step explanation:

Find the value of x for which ABCD Is a parallelogram:
Please help :,)

Answers

Answer :
x =5

Explanation :
In a parallelogram opposite sides are equal.
So, 4x =20 (OR) 3x +10 = 5x
x = 20/4 10 = 5x -3x
x = 5 10 = 2x => x =10/2 => x = 5

I need help with this question

Answers

the answer is D. since angle 2= 100 that also means angle 3, 6, and 7 will = 100.
when they are nect to each other they have to add to be 180.

angle 6 (100°) + angle 5 (80°) = 180°

What does the digit 8 represent in 687, 413?

Answers

Answer:

80,000

hope this helps

have a good day :)

Step-by-step explanation:

Answer:

Hundreths

Step-by-step explanation:


What are the Missing sides?

Answers

Answer:

i think the answer is A ,if I'm wrong plz tell me

Rewrite the following logarithmic expression as an exponential expression

Answers

Answer:

it should be the same answer....?

Step-by-step explanation:

Stephan can type 2700 words in 90 mins Jim can type 2450 in 70 mins gavin can type 1600 words in 40 mins who can type the fastest rate of words per minute

Answers

Answer:

Gavin with 40 words per minute

Step-by-step explanation:

Stephan speed- 2700 words/90 minutes = 30 words per minute

Jim speed- 2450 words/70 minutes= 35 words per minute

Gavin 1600 words / 40 minutes= 40 words per minute

If a vehicle to school and 72 mph how many feet does vehicle travel in one second

Answers

Answer:

The vehicle travels 105.6 feet in one second.

Step-by-step explanation:

This question is solved by proportions.

72 mph

One hour has 3600 seconds.

Each mile has 5280 ft.

So in 3600 seconds, the vehicle travels 5280*72 = 380160 feet. In one second, how many feet?

3600 seconds - 380160 feet

1 seconds - x feet

Applying cross multiplication:

[tex]3600x = 380160[/tex]

[tex]x = \frac{380160}{3600}[/tex]

[tex]x = 105.6[/tex]

The vehicle travels 105.6 feet in one second.

Josh used 3 packages of spaghetti to make dinner for 19 guests. How much did
each guest have?

Answers

Answer:

6.3

Step-by-step explanation:

19/3=6.3 repeating so i just shortened it to 6.3.

final answer: 6.3

Anybody Know? It’s just a SOLVE FOR X

Answers

Answer:

Hello! answer: 10

Step-by-step explanation:

x = 10 because...

10 × 3 = 30 30 + 5 = 35 35 + 55 + 90 = 180 therefore x = 10 hope that helps!

sum of the two angle is equal to 90 degree the ratio of measure of these is 4:5 I what are the measures of these two angle​

Answers

9x =90

x=90/9

=10

4×10= 40

5×10=50

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