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
AleksandrR [38]
3 years ago
15

A random sample of 35 UCF students has a mean electricity bill of $115. Assume the population standard deviation is $18.10. Cons

truct a 90% confidence interval for the mean electricity bill of all UCF students. Round final answer to two decimal places.
Mathematics
1 answer:
HACTEHA [7]3 years ago
5 0

Answer:

Step-by-step explanation:

confidence interval formula is epressed as;

CI = xbar ± z(s/√n)

xbar is the mean = $115

z is the z score at 90% CI = 1.645

s is the standard deviation = 18.10

n is the sample size = 35

Substitute;

CI = 115 ± 1.645(18.10/√35)

CI = 115 ± 1.645(3.0594)

CI = 115± 5.0328

CI = (115-5.0328, 115+5.0328)

CI = (109.97, 120.03)

Hence a 90% confidence interval for the mean electricity bill of all UCF students is 109.97<x<120.03

You might be interested in
Find the values a) 5%of RS 680​
Snowcat [4.5K]

Answer:

5%of RS 680

RS 34

Step-by-step explanation:

==> 5%of RS 680

==> 5% of 680

==> <u>(</u><u>680</u><u>)</u><u>/</u><u>1</u> ×(<u> 5</u><u>)</u><u>/</u><u>1</u><u>0</u><u>0</u>

==> \frac{3,400}{100}  \\

==> 34

3 0
2 years ago
Read 2 more answers
2 vertical buildings are 42 metres apart and the shorter building is 135m high. The angle of elevation from the top of the short
ipn [44]

Answer:

Step-by-step explanation:

base=42 m

height=h=?

base angle θ=60°

tan 60=h/42

h=42tan 60=42√3≈72.75 m

height of taller building=135+42√3 m≈135+72.75≈207.75 m≈208 m

6 0
3 years ago
Assume that when adults with smart phones are randomly selected 45% use them in meetings or classes if 30 adult smart phone user
lozanna [386]

Answer:

2/3

Step-by-step explanation:

I think it is 2/3 because 20 is the probability and 30 are the users. So basically, it is the probability over the total in this case 30. 20/30=2/3. Hope it helps?

5 0
3 years ago
Which lines are parallel to 8x + 4y = 5? Select all that apply.
Dvinal [7]

Answer:

A , B , C

Step-by-step explanation:

1) find the slope of the given line

slope = (-a/b) = (-8/4) = -2

two parallel lines have the same slope

A : correct

B : (-a/b) = -16/8 = -2 (correct)

C : correct

D : wrong (2 is different from -2)

5 0
3 years ago
Read 2 more answers
Pls help fast i dont get this
IrinaVladis [17]
For the first one it is the fourth one 15/x
4 0
3 years ago
Other questions:
  • William bought a new backpack at the store when they were having a 40% off sale. If the regular price of the backpack was $35, h
    5·2 answers
  • Which of the following statements are true
    6·2 answers
  • What is the lateral area of a pyramid with base edges 5 ft and surface area 55 ft2?
    11·2 answers
  • What is the unit rate of the table?
    15·1 answer
  • Which of the following numbers is greater than 190,090?
    11·1 answer
  • How do you do this I really need help
    14·1 answer
  • What is the length of the diagonal of a rectangle whose width is 90 cm and whose length is 200 cm?
    6·2 answers
  • 6 points and brainliest answer
    14·2 answers
  • 10lb bag of potatoes or $5.50 or 15lb bag of potatoes for $8.40 which is a better deal​
    14·1 answer
  • (-5)x (-5) x (-5) x (-5) = <br> What would the answer be <br><br> 20 points
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!