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
Evgen [1.6K]
3 years ago
6

A market researcher for a provider of music player accessories wants to know the proportion of customers who own cars to assess

the market for a new car charger. A survey of 400400 customers indicates that 7373​% own cars. ​a) What is the estimated standard deviation of the sampling distribution of the​ proportion? ​b) How large would the estimated standard deviation have been if he had surveyed only 100100 customers​ (assuming the proportion is about the​ same)?
Mathematics
1 answer:
AVprozaik [17]3 years ago
7 0

Answer:

a) The estimated standard deviation of the sampling distribution of the​ proportion is 0.023

b) the estimated standard deviation have been if he had surveyed only 100 customers is 0.046

Step-by-step explanation:

given information:

the number of sample, n = 400

sample proportion, p = 70% = 0.7

a) standard deviation of a sample proportion is

σ = \sqrt{\frac{p(1-p)}{n}}

  = \sqrt{\frac{0.7 (1-0.7)}{400} }

  = 0.023

b) if n = 100, so

σ = \sqrt{\frac{p(1-p)}{n}}

  = \sqrt{\frac{0.7 (1-0.7)}{100} }

  = 0.046

You might be interested in
3+5=5+ 3•5=5•2+(-2)=0TRUE OR FALSE ? ( for all three of them )
Savatey [412]

Take into account that commutative property is present for addition and multiplication operations, then, you have:

3+5=5+3 TRUE

3·5 = 5·3 TRUE

The inverse addition of a number consists in adding the same numbers but with opposite signs, then, you have:

2 + (-2) = 0 TRUE

7 0
1 year ago
What is the value of x 2/3-1=11.
never [62]

Answer:

18

Step-by-step explanation:

4 0
3 years ago
3 more than twice a number is 17 (how do I translate into a equation?)
makkiz [27]
U need to convert it
8 0
3 years ago
X-intercept = 3, y-intercept = 2
Katen [24]

Answer:

Step-by-step explanation:

(3, 0) (0, 2)

(2-0)/(0-3) = 2/-3= -2/3

y - 0 = -2/3(x - 3)

y = -2/3x + 2

8 0
3 years ago
Homework help, one of the few I have
Alex73 [517]

Answer:

x=4 and the solution is not extraneous

Step-by-step explanation:

\sqrt{2x+1}=3 \\\\2x+1=9 \\\\2x=8 \\\\x=4

This solution is not extraneous, because plugging it back in you get:

\sqrt{2(4)+1}=3 \\\\\sqrt{9}=3 \\\\3=3

Hope this helps!

8 0
3 years ago
Read 2 more answers
Other questions:
  • Here james and stuff i need this
    13·1 answer
  • you have 4/6 cup of flour in your cupboard a recipe for bread calls for 1/4 cup of flour how much flour would you have left if y
    9·1 answer
  • If y= -cos x, what x-value corresponds to a y-value of 1 between 0 and 2 pi
    7·1 answer
  • The average score on a standardized test is 750 points with a standard deviation of 50 points. What is the probability that a st
    5·2 answers
  • What is the area of the actual living room in square feet? Round your answer to the nearest whole number.
    12·2 answers
  • A right pyramid with a square base has a base length
    11·2 answers
  • What is the fraction of 3\4 of 28
    15·1 answer
  • Did you ever get the answer
    6·1 answer
  • The probability that Scott will win his next tennis match is \frac{3}{5}
    14·1 answer
  • 1 David buys 4 kg of apples from the supermarket for £1.60.
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!