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3 years ago

Please help i need the answer asap

Mathematics

1 answer:

Karolina [17]3 years ago

8 0

Answer:

I need points interact so I could do it

Step-by-step explanation:

lol

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a sample of 412 adults showed that 293 of them are connected the the internet from home. Construct and interpret a 90% confidenc

Anna [14]

Answer:

CI = (0.674, 0.748)

Step-by-step explanation:

The confidence interval of a proportion is:

CI = p ± SE × CV,

where p is the proportion, SE is the standard error, and CV is the critical value (either a t-score or a z-score).

We already know the proportion:

p = 293/412

p = 0.711

But we need to find the standard error and the critical value.

The standard error is:

SE = √(p (1 − p) / n)

SE = √(0.711 × (1 − 0.711) / 412)

SE = 0.0223

To find the critical value, we must first find the alpha level and the degrees of freedom.

The alpha level for a 90% confidence interval is:

α = (1 − 0.90) / 2 = 0.05

The degrees of freedom is one less than the sample size:

df = 412 − 1 = 411

Since df > 30, we can approximate this with a normal distribution.

If we look up the alpha level in a z score table or with a calculator, we find the z-score is 1.645. That's our critical value. CV = 1.645.

Now we can find the confidence interval:

CI = 0.711 ± 0.0223 * 1.645

CI = 0.711 ± 0.0367

CI = (0.674, 0.748)

So we are 90% confident that the proportion of adults connected to the internet from home is between 0.674 and 0.748.

5 0

3 years ago

Which scenario reflects an annual inflation rate of 2%? In year 1, the price of a tire is $100. In year 2, the same tire costs $

katrin [286]

Answer:

The correct answer is 2. 2. In year 1, the price of a candy bar is $0.50. In year 2, the same candy bar is $0.51.

Price of candy bar in Yr 2 should be = 0.50 * 1.02 = 0.51

This scenario reflects an inflation of 2%.

Step-by-step explanation:

Let's check each scenario and select the one that reflects an annual inflation rate of 2%.

1. In year 1, the price of a tire is $100. In year 2, the same tire costs $120.

Price of tire in Yr 2 should be= 100 * 1.02 = 102

This scenario reflects an inflation of 20%. Not the one we're looking for.

2. In year 1, the price of a candy bar is $0.50. In year 2, the same candy bar is $0.51.

Price of candy bar in Yr 2 should be = 0.50 * 1.02 = 0.51

This scenario reflects an inflation of 2%. This is the correct answer.

3. In year 1, the price of a pair of shoes is $30. In year 2, the same pair of shoes is $32

Price of pair of shoes in Yr 2 should be= 30 * 1.02 = 30.60

This scenario reflects an inflation of 6.7%. Not the one we're looking for.

4. In year 1, the price of a pair of headphones is $20. In year 2, the same pair of headphones is $21.

Price of pair headphones in Yr 2 should be= 20 * 1.02 = 20.40

This scenario reflects an inflation of 5%. Not the one we're looking for.

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4 years ago

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Vanyuwa [196]

Answer:

57%

Step-by-step explanation:

200+245+125 = 570

570/1000 = .57

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4 years ago

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What is 1 1/3-6/7 PLEASE I WILL GIVE YOU ALL MY BRIANLIST HELPPP

kifflom [539]

Answer:

10/21

Step-by-step explanation:

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3 years ago

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Will mark Brainliest

saveliy_v [14]

The solutions are where the quadratic is equal to 0, or when the quadratic crosses the x axis.

Where the quadratic crosses the x axis are the solutions:

6) x = –5, x = –6

7) x = 0, x = 1

8) x = –6, x = 1

9) x = –4, x = –3

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3 years ago