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
Paha777 [63]
3 years ago
9

The electric cooperative needs to know the mean household usage of electricity by its non-commercial customers in kWh per day. A

ssume that the population standard deviation is 1.8 kWh. The mean electricity usage per family was found to be 15.8 kWh per day for a sample of 872 families. Construct the 98% confidence interval for the mean usage of electricity. Round your answers to one decimal place.
Mathematics
1 answer:
Montano1993 [528]3 years ago
4 0

Answer: (14.4, 17.2)

Step-by-step explanation: We are to construct a 98% confidence interval for mean household usage of electricity.

We have been given that

Sample size (n) = 872

Sample mean (x) = 15.8

Population standard deviation (σ) = 1.8

The formulae that defines the 98% confidence interval for mean is given below as

u = x + Zα/2 × σ/√n...... For the upper limit

u = x - Zα/2 × σ/√n...... For the lower limit

Zα/2 = critical value for a 2% level of significance in a two tailed test = 2.33

By substituting the parameters we have that

For upper tailed

u = 15.8 + 2.33 × (1.8/√872)

u = 15.8 + 2.33 (0.6096)

u = 15.8 + 1.4203

u = 17.2

For lower tailed

u = 15.8 - 2.33 × (1.8/√872)

u = 15.8 - 2.33 (0.6096)

u = 15.8 - 1.4203

u = 14.4

Hence the 98% confidence interval for population mean usage of electricity is (14.4kwh, 17.2kwh)

You might be interested in
100 / 2 * 5 = ??????
Karolina [17]
The answer is 250

100/2 = 50

50 * 5 = 250 
3 0
3 years ago
Read 2 more answers
77. Find the greatest common factor (GCF) of the polynomial: 12x^4 + 8x^3 - 16x^2
Fed [463]

Answer:

4x^2

Step-by-step explanation:

The greatest common factor of 12, 8, and 16 can be no larger than the smallest difference between these numbers, which is 4. 4 is a factor of each number, so is the GCF of them.

The exponent of the greatest common factor of x^4, x^3, and x^2 can be no larger than the smallest of these exponents, which is 2. So, the GCF of the variable portion of the terms is x^2.

The product of the coefficient GCF and the variable GCF is ...

... 4x^2

5 0
3 years ago
9. Verify experimentally that alternate angles are equal​
hoa [83]

Answer:

i am not sure if i answered your question correctly or not

Step-by-step explanation:

the Alternate Interior Angles Theorem states that, when two parallel lines are cut by a transversal , the resulting alternate interior angles are congruent . So, in the figure below, if k∥l , then ∠2≅∠8 and ∠3≅∠5

hope this help:)

6 0
3 years ago
Data is collected on the number of ice cream cones sold in a shop on a certain day and the number of people wearing sunglasses v
harkovskaia [24]

Answer:

3. positive correlation but not causal relationship

Step-by-step explanation:

A positive correlation is when one factor increases, the other factor increases as well.

A negative correlation is when one factor increases, the other factor decreases.

A causal relationship is when one factor <em>causes </em>the other factor change in a certain way (i.e. increase or decrease).

More people buy ice cream as the day becomes hotter and sunnier. This also applies to people choosing to wear sunglasses. Therefore, there is a positive correlation between the two (because both increase). However, this is not a causal relationship because the cause of both is the hotter and sunnier day.

I hope this helps! If you have any question, feel free to as. :)

8 0
3 years ago
30 + 6p = 7 (p+ 6 ) -5<br> Please answer
melamori03 [73]

Answer: p=-7

Step-by-step explanation:

To solve for p, you want to isolate the variable, get p alone. You would use different algebraic properties to do so.

30+6p=7p+42-5

30+6p=7p+37

-7=p

p=-7

6 0
3 years ago
Read 2 more answers
Other questions:
  • W=B(L1-L2)/6 solve for L2<br><img src="https://tex.z-dn.net/?f=w%20%3D%20%20b%5Cfrac%7B%20l1%20-l2%20%7D%7B6%7D%20" id="TexFormu
    12·1 answer
  • Hhhehdhdhdd dbdhshshsnnsmemsiskzmdbbdhdhdhdbdb sbdb
    7·1 answer
  • HELP QUICK PLSS !! <br><br> How many terms are in this expression?<br><br> 1 + 5t
    6·2 answers
  • Fingernails grow 1.5 inches per year. How long would it take to grow them 37 inches
    11·1 answer
  • Describe the error Sadie made, and explain how to find the correct answer. (Refer to image)
    11·2 answers
  • PLEASE HELP!!! I WILL GIVE BRIANLEY TO CORRECT ANSWER!!
    12·1 answer
  • A bottle contains 24oz of liquid medication.If the average dose is 2/3oz. How many dose does the bottle contain
    12·1 answer
  • Marcus is biking at 15 kilometers per hour. How long will it take Marcus to travel 37.5 kilometers?
    10·2 answers
  • Rewrite each equation in standard form. <br><br> 4 and 5 only
    15·1 answer
  • I need help asap. everythings in the image
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!