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4 years ago

Suppose all left-handed people are excluded from a sample. What is this an example of?

Mathematics

2 answers:

Pavlova-9 [17]4 years ago

7 0

Answer: Selection Bias

Gala2k [10]4 years ago

3 0

The proportion of left-handed people in the general population is about 0.1. Suppose a random sample of 225 people is observed.

1. What is the sampling distribution of the sample proportion (p-hat)? In other words, what can we say about the behavior of the different possible values of the sample proportion that we can get when we take such a sample?

(Note: normal approximation is valid because .1(225) = 22.5 and .9(225) = 202.5 are both more than 10.)

2. Since the sample proportion has a normal distribution, its values follow the Standard Deviation Rule. What interval is almost certain (probability .997) to contain the sample proportion of left-handed people?

3. In a sample of 225 people, would it be unusual to find that 40 people in the sample are left-handed?

4. Find the approximate probability of at least 27 in 225 (proportion .12) being left-handed. In other words, what is P(p-hat ? 0.12)?

Guidance: Note that 0.12 is exactly 1 standard deviation (0.02) above the mean (0.1). Now use the Standard Deviation Rule.

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What percent? What percent of the first 20 natural numbers are prime numbers?

Mice21 [21]

Let's find all the prime numbers.

1,3,5,7,9,11,13,15,17,19

They are not divisible by 2.

Put that into a fraction, where the amount of numbers is the numerator and the total amount of numbers is the denominator.

10/20

That is half of 20.

So, 50% of the 20 first natural numbers are prime.

I hope this helps!
~cupcake

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3 years ago

Read 2 more answers

When 5 times a number is added to 45 the answer is the sm of 85 and 140 what is the number

zimovet [89]

Hello.

First, let the number be r.

5 times r is written like this:

$\rm{5r}$

Now, add 45:

$\mathrm{5r+45}$

Now, the sum of 5r+45 is equal to the sum of 85 and 140:

$\mathrm{5r+45=85+140}$

In order to solve this equation, we need to add 85 and 140:

$\mathrm{5r+45=225}$

Now, subtract 45 from both sides:

$\mathrm{5r+45-45=225-45}$

$\mathrm{5r=225-45}$

$\mathrm{5r=180}$

The last step is to divide both sides by 5:

$\mathrm{r=36}$

Therefore, the answer is

$\rm{r=36}$

I hope it helps.

Have a nice day.

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3 years ago

SCORPION-xisa [38]

Answer:

It's 15

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Step-by-step explanation:

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3 years ago

What is x 1/4(8x+12)=21

tatiyna

Answer:

x = 9

Step-by-step explanation:

1/4(8x+12) =21

1/4 * 8x = 2x

1/4 * 12 = 3

2x + 3 = 21

21 - 3 = 18

2x = 18

18/2 = 9

x = 9

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mr_godi [17]

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3 years ago