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
White raven [17]
3 years ago
14

In a rural area, only about 30% of the wells that are drilled find adequate water at a depth of 100 feet or less. A local man cl

aims to be able to find water by "dowsing"—using a forked stick to indicate where the well should be drilled. You check with 80 of his customers and find that 27 have wells less than 100 feet deep. What do you conclude about his claim?
a) Write appropriate hypotheses.
b) Check the necessary assumptions.
c) Perform the mechanics of the test. What is the P-value?
d) Explain carefully what the P-value means in context. e) What’s your conclusion?
Mathematics
1 answer:
Diano4ka-milaya [45]3 years ago
3 0

Answer:

Step-by-step explanation:

Given that in a rural area, only about 30% of the wells that are drilled find adequate water at a depth of 100 feet or less.

The sample size n = 80

no of wells less than 100 feet deep=27

Sample proportion = \frac{27}{80} =0.3375

a) Create hypotheses as

H_0: p = 0.30\\H_a: p >0.30\\

(Right tailed test)

p difference = 0.3375-0.30 = 0.0375

Std error of p = \sqrt{\frac{0.3(0.7)}{80} } =0.0512

b) Assumptions: Each trial is independent and np and nq >5

c) Z test can be used.

Z= p diff/std error = \frac{0.0375}{0.0512} =0.73

p value = 0.233

d) p value is the probability for which null hypothesis is false.

e) Conclusion: Since p >0.05 we accept null hypothesis

there is no statistical evidence which support the claim that more than 30% are drilled.

You might be interested in
The estimated product of 20.7 and 9.18 after rounding both factors to the nearest whole number is
gogolik [260]
189 because 20.7 rounds to 21 and 9.18 rounds to 9
21 * 9 = 189

7 0
3 years ago
Read 2 more answers
Right? Pls reply ASAP i need this before 11:45am in need pls hurry
SVETLANKA909090 [29]

Answer:

I think so.

Step-by-step explanation:

If you do the math 2(5-3) exponent 2 - 4 = 4

So if y is 4 you should be correct!

Thb I think you need to know the value of y to solve this question.

6 0
2 years ago
PLEASE HELP!!!<br> Solve for x: 3 over quantity x minus 4 equals 7 over x
uranmaximum [27]

Answer:

Solve for x

Multiply in cross

distributive property right side

subtract 3x both sides

Adds 28 both sides

Divide by 4 both sides and rewrite

Step-by-step explanation:

4 0
2 years ago
An inch is approximately 2.54 centimeters. Does the number of inches vary directly or indirectly with the numbers of centimeters
AnnZ [28]
Its directly because it is it is hard to expain 
    
8 0
3 years ago
Simplify by expressing fractional exponents instead of radicals
igomit [66]

Answer:

a^{\frac{1}{2}}b^{\frac{1}{2}}

Step-by-step explanation:

Given:

The expression in radical form is given as:

\sqrt{ab}

We need to express this in fractional exponent form.

We know that,

\sqrt a=a^{\frac{1}{2}}

Also, \sqrt{ab}=\sqrt a\times \sqrt b

Now, clubbing both the properties of square root function, we can rewrite the given expression as:

\sqrt{ab}=\sqrt a \times \sqrt b\\\\\sqrt{ab}=a^{\frac{1}{2}}\times b^{\frac{1}{2}}\\\\\therefore \sqrt{ab}=a^{\frac{1}{2}}b^{\frac{1}{2}}

So, the given expression in fractional exponents form is a^{\frac{1}{2}}b^{\frac{1}{2}}.

3 0
3 years ago
Other questions:
  • Please help I only have 10 minutes!
    11·1 answer
  • I don't know whats wrong, please help. It is the exact formula.
    9·2 answers
  • stickers are made with the same ratio of width to length. A stickers 2 inches wide has a length of 4 inches.
    9·1 answer
  • Player II is moving an important item in one of three cars, labeled 1, 2, and 3. Player I will drop a bomb on one of the cars of
    5·1 answer
  • I need the solution
    10·1 answer
  • Can someone help me with this question please
    6·2 answers
  • What is the x-intercept of the equation 4x - 5y = - 20
    11·1 answer
  • Answer po plss plss pls
    5·2 answers
  • Find
    6·2 answers
  • Find each missing measure for 1, 2, 3, and 4. Giving brainliest!
    11·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!