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
vovangra [49]
3 years ago
11

You wish to find a 95% confidence interval for the mean number of times men change channels with a remote control during a comme

rcial. based on a preliminary study, you estimate σ = 15. how many commercials' worth of data do you need to have a margin of error no more than 3?
Mathematics
1 answer:
gogolik [260]3 years ago
4 0
For margin of error to be a maximum of 3:
3 = z*(SD / sqrt(n)), where z is the z-score, SD is the standard deviation and n is the sample size.
z = 1.96 for a 95% confidence interval, and we are given SD = 15.
3 = 1.96*15/sqrt(n)
sqrt(n) = 9.8
n = 96.04 ~ 96 commercials.

You might be interested in
Help me help me help me
Vinil7 [7]

Answer:

40 dollars the answer is 40!!!

6 0
3 years ago
a group of 31 friends gets together to play a sport. first people must be divided into teams. each team has to exactly 4 players
azamat
We have the following values:
 Total people: 31
 People per team: 4
 The number of teams will then be:
 N = (31) / (4)
 N = 7.75
 Round to the previous whole number.
 N = 7
 There are 7 teams.
 Answer:
 
they can make about 7 teams.
3 0
3 years ago
Jeremy is recording the weights, in ounces, of different rock samples in a lab. The weights of seven rocks are listed below.
RideAnS [48]
The value of the (RIC) will increase from 4 to 5.75,that is,44%
8 0
3 years ago
Read 2 more answers
Write 2x + y = 10 in slope intercept form
Viktor [21]
Slope intercept form is y = mx + b.
To convert 2x + y = 10 to slope intercept form, solve for y.
2x + y = 10
y = -2x + 10
4 0
3 years ago
What is the correct answer need answer ASAP<br> question 9​
Lana71 [14]
No is the answer. If she works 20 hours at Kroger ($8 x 20 hours = 160) and 15 hours babysitting($15 x 15 hours = 225) 160 + 225 = $385
7 0
3 years ago
Other questions:
  • A company makes cars at two factories. Some of the cars need repairs in the first year and some do not. This two-way frequency t
    8·1 answer
  • A number added to itself equals 3 less than the number..
    15·1 answer
  • A building 30 feet tall casts a shadow 20 feet long. A person 6 feet tall is walking directly away from the building toward the
    8·1 answer
  • What is 11 to the power of 234?
    7·1 answer
  • I need help please in ese
    9·1 answer
  • If I want to buy a pair of sunglasses and the original price is $120, how much will I pay if they are 50% off? What if they were
    14·1 answer
  • given that sin theta= 1/4, 0 is less than theta but less than pi/2, what is the exact value of cos theta
    14·1 answer
  • The perimeter of a square is given as 6c-4(0-5). What expression gives the length of one side of the square?​
    7·2 answers
  • What is 12% added to $1.78
    5·1 answer
  • In rectangle GRAM below GA =4×+17 and MR= 7x-4 find the value of x and the lenghts of GA MR
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!