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
olga_2 [115]
2 years ago
5

The sample size needed to estimate the difference between two population proportions to within a margin of error E with a signif

icance level of ? can be found as follows. In the expression
E=z?p1(1?p1)n1+p2(1?p2)n2?????????????????????????
we replace both n1 and n2 by n (assuming that both samples have the same size) and replace each of p1, and p2, by 0.5 (because their values are not known). Then we solve for n, and get
n=(z?)22E2.
Finally, increase the value of n to the next larger integer number.
Use the above formula and Table C to find the size of each sample needed to estimate the difference between the proportions of boys and girls under 10 years old who are afraid of spiders. Assume that we want a 99% confidence level and that the error is smaller than 0.07.
n=______.
Mathematics
1 answer:
devlian [24]2 years ago
3 0

Answer:

n= (z)22E2

n=10× 99%÷ 0.07

You might be interested in
Can anybody help <br> 48=x^2+2x
lubasha [3.4K]

Answer:

x^{2} + 2x - 48 = 0

-> x = 6, x = -8

4 0
3 years ago
To get a B in​ math, Alexandria Pappas must average 80 on five tests. Scores on the first four tests were 82​,74​,82​,and 74.Wha
motikmotik

Answer:

88 score.

Step-by-step explanation:

Given:

To get a B in​ math, Alexandria Pappas must<u> average 80</u> on five tests.

Scores on the first four tests were <em>82​, 74​, 82​, and 74.</em>

Question asked:

What is the lowest score that she can get on the last test and still get a​ B?

Solution:

Let lowest score she can get on the last test = x

As we know:

Average=\frac{Sum\ of \ observations}{Number\ of\ observations}\\ \\ 80=\frac{82+74+82+74+x}{5} \\ \\

By cross multiplication:-

80\times5=312+x \\ \\400=312+x\\Subtracting\ both\ sides\ by\ 312\\400-312=312-312+x\\88=x

Thus, she can get 88 score on the last test to get a B in​ math.

5 0
3 years ago
Find the 1st , 2nd (median) and 3rd quartile of the set of numbers 6,8,2,6,7,9 ?
zubka84 [21]

Answer:

at first we put the numbers in order from least to greatest

2 , 6 , 6 , 7 , 8 , 9

1st quartile = 6

median = (6+7)/2 = 6.5

3rd quartile = 8

5 0
3 years ago
If Michael and Imani add 18% tip to the bill what does their lunch cost in total
Musya8 [376]

Answer:

X + (0.18 * X)  

where X is the price of the bill without the tip

Step-by-step explanation:

The first thing you have to do is convert the percentage to a decimal value. For example, if it is 30%, its decimal value is 0.30. As simple as dividing that 300 by 100. Repeat the previous step with all the percentages you have to add.

In this case it is 18% therefore the decimal value will be 0.18. As we do not have the value of the account, we will call this value X .

Therefore the total price of the account, that is, with the addition of the tip is as follows:

X + 18% de X =

X + (0.18 + X)

7 0
2 years ago
Is y=2x+20 proportional
kow [346]

Answer: Yes it is!

Step-by-step explanation:

7 0
3 years ago
Other questions:
  • Which of the following is equivalent to the equation below
    8·1 answer
  • There are 125 students in sixth grade. 2/3 of the sixth graders ride the bus. How many sixth graders ride the bus?​
    9·1 answer
  • Whats 16/40 as a mixed fraction?
    11·1 answer
  • Can you please answer fast and please explain thank you so much
    10·1 answer
  • Light travels 1.18 x 10^10in. In 1 second. How far will light travel in 1 nanosecond or 1 x 10^-9s
    10·1 answer
  • What does 10×{-5} equal?
    11·2 answers
  • The rule T 5, -0.5° Ro, 1800(x, ) is applied to FGH to
    13·1 answer
  • Milan is riding on a bike course that is 60 mlles long. So far, he has ridden 24 miles of the course. What percentage of the cou
    13·1 answer
  • The number of donuts produced by a machine is directly proportional to the time the machine runs . The machine produces 380 donu
    13·1 answer
  • Help me answer this question
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!