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elixir [45]
3 years ago
10

nếu nhà nghiên cứu chọn đơn vị thứ k từ một tổng thể n đơn vị, điều này có ý nghĩa cô ấy đang sử dụng kỹ thuật chọn mẫu nào? Vì

sao?
Mathematics
1 answer:
stiv31 [10]3 years ago
4 0

Answer:

Simple random sampling

Step-by-step explanation:

Every element of the population does have an equal probability of getting chosen in a basic random sampling. The entire population should be included in your sample frame. To conduct this sort of sampling, technologies such as random numbers or other approaches relying completely on chance can be used.

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Answer:

yes

Step-by-step explanation:

Find the amount of the sales tax:

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Add the sales tax to the items total:

46 + 2.76 = 48.76

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Since $48.76 is less than $50 he has enough money

5 0
3 years ago
Suppose a student's score on a standardize test to be a continuous random variable whose distribution follows the Normal curve.
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Answer:

a) Percentage of students scored below 300 is 1.79%.

b) Score puts someone in the 90th percentile is 638.

Step-by-step explanation:

Given : Suppose a student's score on a standardize test to be a continuous random variable whose distribution follows the Normal curve.

(a) If the average test score is 510 with a standard deviation of 100 points.

To find : What percentage of students scored below 300 ?

Solution :

Mean \mu=510,

Standard deviation \sigma=100

Sample mean x=300

Percentage of students scored below 300 is given by,

P(Z\leq \frac{x-\mu}{\sigma})\times 100

=P(Z\leq \frac{300-510}{100})\times 100

=P(Z\leq \frac{-210}{100})\times 100

=P(Z\leq-2.1)\times 100

=0.0179\times 100

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Percentage of students scored below 300 is 1.79%.

(b) What score puts someone in the 90th percentile?

90th percentile is such that,

P(x\leq t)=0.90

Now, P(\frac{x-\mu}{\sigma} < \frac{t-\mu}{\sigma})=0.90

P(Z< \frac{t-\mu}{\sigma})=0.90

\frac{t-\mu}{\sigma}=1.28

\frac{t-510}{100}=1.28

t-510=128

t=128+510

t=638

Score puts someone in the 90th percentile is 638.

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3 years ago
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Answer:

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4

∑  (5)^i

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1+5+25+125+625

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Step-by-step explanation:

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