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yawa3891 [41]
3 years ago
6

A random sample of 1500 residential telephones in Phoenix found that 394 of the numbers were unlisted. A random sample in the sa

me year of 1200 telephones in Scottsdale found that 313 were unlisted.
A. Find a 95% confidence interval on the difference in the two proportions and use this confidence interval to determine 2010 whether there is a statistically significant difference in proportions of unlisted numbers between the two cities.
B. Find a 90% confidence interval on the difference in the two proportions and use this confidence interval to determine 2010 whether there is a statistically significant difference in proportions of unlisted numbers for the two cities.
Mathematics
1 answer:
ololo11 [35]3 years ago
6 0

Answer:

3089

Step-by-step explanation:

3089

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Angela bought gifts for her friends in each gift was $10 Y represent the total cost and X represent the number of guests right i
Nezavi [6.7K]

Answer:

each gift =$10

total=y

number of gifts =x

therefore,total= each gift * number of gifts

=$10* x

6 0
3 years ago
Cant find the answer
dedylja [7]

Answer:

Carter family = 25 hours

Davis family = 31 hours

Step-by-step explanation:

Let's say the number of hours the Carter family used their sprinkler is x and the number of hours the Davis family used their sprinkler for is y.

So combined:

x + y = 45 hours

and we are also told that:

40x + 15y = 1300 L

So we can do simultaneous equations to solve the problem.

With some rearranging, we can figure out that:

y= 45 - x

and by substituting that into the second equation:

40x + 15 (45 -x) = 40x + 675 - 15x = 1300L

25x = 1300 - 675

25x = 625

x = 25 = hours that the Carter family used their sprinkler

and we can substitute that back into the original equation to find how many hours the Davis family used their sprinkler so:

25 + y = 56

y = 31

The Davis family used their sprinkler for 31 hours whilst the Carter family used their sprinkler for 25 hours.

7 0
1 year ago
What is the volume of a box with sidelines that are 20 inches use the formula B equals S3 where is S is the length of one side
anastassius [24]

Answer:

The volume of a box with sidelines that are 20 inches is 8000 cubic inches

Step-by-step explanation:

The volume of a box with sidelines that are 20 inches can be determined by using the formula

B = S³

Where S is the length of one side

and B is the Volume

From the question, the sidelines of the box are 20 inches. That is

S = 20 inches

From

B = S³

B = (20 inches)³

B = 20 inches × 20 inches × 20 inches

B = 8000 cubic inches

Hence, the volume of a box with sidelines that are 20 inches is 8000 cubic inches.

4 0
2 years ago
Which expression is equivalent to −3(−4m+9n)?
prohojiy [21]

Answer:

Yuhh the answers c dawhggg trus me i just did the same thing lawl!

Step-by-step explanation:

5 0
2 years ago
Find the area of the following triangle:<br> 18<br> 9<br> 11<br> 14<br> Note: Figure not to scale.
Nataly [62]

Answer:

sorry but where is the triangle ️

3 0
2 years ago
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