1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Tamiku [17]
3 years ago
5

A teacher claims that the proportion of students expected to pass an exam is greater than 80%. To test this claim, the teacher a

dministers the test to 200 random students and determines that 151 students pass the exam. The following is the setup for this hypothesis test: {H0:p=0.80 Ha:p>0.80 Find the test statistic for this hypothesis test for a proportion. Round your answer to 2 decimal places.
Provide your answer below: $$

test statistic:
Mathematics
1 answer:
erica [24]3 years ago
6 0

Answer:

z=-1.591

Step-by-step explanation:

Null Hypotheses,

H_0 : p=0.8\\H_a: p>0.80

So we use z-test for one population proportion (right-tailed test)

According to this informaton, we defined that

\alpha=0.05

z_c=1.64 (critical value)

So our Rejection region is R={z:z>1.64}

z=\frac{\bar{p}-p_0}{\sqrt{p_0(1-p_0)/n}} = \frac{0.755-0.8}{\sqrt{0.8(1-0.8)/200}}=-1.591

Not rejection.

You might be interested in
7÷9932 i need help with this and i have to show the work
Rashid [163]

Answer:

the answer is 7 over 9932!

Step-by-step explanation:


6 0
3 years ago
A N S W E R Q U I C K P L E A S E
chubhunter [2.5K]

Answer:

1. A

2. D

3. D

Step-by-step explanation:

The standard form of a parabola is

y=\frac{1}{4p}(x-h)^2+k            ..... (1)

Where, (h,k) is vertex, (h,k+p) is focus and y=k-p is directrix.

1. The directrix of a parabola is y=−8 . The focus of the parabola is (−2,−6) .

k-p=-8                   ...(a)

(h,k+p)=(-2,-6)

k+p=-6            .... (b)

h=-2

On solving (a) and (b),  we get k=-7 and p=1.

Put h=-2, k=-7 and p=1 in equation (1).

y=\frac{1}{4(1)}(x-(-2))^2+(-7)

y=\frac{1}{4}(x+2)^2-7

Therefore option A is correct.

2 The directrix of a parabola is the line y=5 . The focus of the parabola is (2,1) .

k-p=5                   ...(c)

(h,k+p)=(2,1)

k+p=1            .... (d)

h=2

On solving (c) and (d),  we get k=3 and p=-2.

Put h=2, k=3 and p=-2 in equation (1).

y=\frac{1}{4(-2)}(x-(2))^2+(3)

y=-\frac{1}{8}(x-2)^2+3

Therefore option D is correct.

3. The focus of a parabola is (0,−2) . The directrix of the parabola is the line y=−3 .

k-p=-3                   ...(e)

(h,k+p)=(0,-2)

k+p=-2            .... (f)

h=0

On solving (e) and (f),  we get k=-2.5 and p=0.5.

Put h=0, k=-2.5 and p=0.5 in equation (1).

y=\frac{1}{4(0.5)}(x-(0))^2+(-2.5)

y=\frac{1}{2}(x)^2-2.5

y=\frac{1}{2}(x)^2-\frac{5}{2}

Therefore option D is correct.

5 0
3 years ago
Help me to solve the following math problem:
serious [3.7K]

Answer: I think it’s 1/3

Step-by-step explanation:

4 0
3 years ago
What is the sum of ¾ + ⅔ in simplistic form
fiasKO [112]

We must find the common denominator.

The list of multiples of 4: 0, 4, 8, 12, 16, 20, ...

The list of multiples of 3: 0, 3, 6, 9, 12, 15, 18, ...

The common denominator is 12.

\dfrac{3}{4}=\dfrac{3\cdot3}{4\cdot3}=\dfrac{9}{12}\\\\\dfrac{2}{3}=\dfrac{2\cdot4}{3\cdot4}=\dfrac{8}{12}

Therefore:

\dfrac{3}{4}+\dfrac{2}{3}=\dfrac{9}{12}+\dfrac{8}{12}=\dfrac{9+8}{12}=\dfrac{17}{12}=\dfrac{12+5}{12}=1\dfrac{5}{12}

<h3>Answer: 17/12 = 1 5/12</h3>
4 0
3 years ago
PLS OMG HELP ME ITS DUE SOON im gonna cry if no one helps, ive been posting these questions all day and no ones actually answeri
scZoUnD [109]

Answer:

X-Intercepts of the function.

Step-by-step explanation:

You'll do well to remember that. Good luck! I hate math!

7 0
3 years ago
Read 2 more answers
Other questions:
  • If it takes 125 joules to heat a piece of gold weighing 35 g from 18.0 °C to 43.0 °C, what is the specific heat of the gold?
    5·1 answer
  • Which shape has opposite sides that are parallel and 4 sides that are always the same length? A. parallelogram B. rhombus C. tra
    7·1 answer
  • Pls help dis is due tomorrow n I have a science project also due so pls help me
    7·1 answer
  • PLZ HELP ME WITH THIS PROBLEM I DON'T HAVE THAT MUCH TIME!!
    9·2 answers
  • The elivation of city A is 60 feet above sea level; the elevation of city C is 12 feet above sea level. The elevation of city D
    15·1 answer
  • If the following is an exponential growth function, f(x)=3(A)^x , what can the value of A be? Select all that apply.
    15·2 answers
  • What is the circumference of a circle with a diameter of 5 feet? use 3.14 for pi
    13·1 answer
  • How does interest rate affect money earned on a savings account?
    12·1 answer
  • Helloooo it’s me again, pls help
    11·1 answer
  • Please someone Help me 100 points
    15·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!