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3 years ago

What is a probability distribution?

Mathematics

2 answers:

artcher [175]3 years ago

8 0

Answer:

Probability distribution is a statistical function that describes the possible values as well as the likely hood that a random variable can obtain given a specific range

Nuetrik [128]3 years ago

3 0

Answer:

In probability theory and statistics, a probability distribution is a mathematical function that provides the probabilities of occurrence of different possible outcomes in an experiment.

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"A cable TV company wants to estimate the percentage of cable boxes in use during an evening hour. An approximation is 20 percen

Marizza181 [45]

Answer:

The company should take a sample of 148 boxes.

Step-by-step explanation:

Hello!

The cable TV company whats to know what sample size to take to estimate the proportion/percentage of cable boxes in use during an evening hour.

They estimated a "pilot" proportion of p'=0.20

And using a 90% confidence level the CI should have a margin of error of 2% (0.02).

The CI for the population proportion is made using an approximation of the standard normal distribution, and its structure is "point estimation" ± "margin of error"

[p' ± $Z_{1-\alpha /2} * \sqrt{\frac{p'(1-p')}{n} }$ ]

Where

p' is the sample proportion/point estimator of the population proportion

$Z_{1-\alpha /2} * \sqrt{\frac{p'(1-p')}{n} }$ is the margin of error (d) of the confidence interval.

$Z_{1-\alpha /2} = Z_{1-0.05} = Z_{0.95}= 1.648$

$d= Z_{1-\alpha /2} * \sqrt{\frac{p'(1-p')}{n} }$

$d *Z_{1-\alpha /2}= \sqrt{\frac{p'(1-p')}{n} }$

$(d*Z_{1-\alpha /2})^2= \frac{p'(1-p')}{n}$

$n*(d*Z_{1-\alpha /2})^2= p'(1-p')$

$n= \frac{p'(1-p')}{(d*Z_{1-\alpha /2})^2}$

$n= \frac{0.2(1-0.2)}{(0.02*1.648)^2}$

n= 147.28 ≅ 148 boxes.

I hope it helps!

3 0

4 years ago

answer What happens to the probability of landing on blue as more and more sections are added to the spinner?

sveta [45]

Answer: the probability of landing on blue as more and more colors are added is low because as you add more colors there is less and less of the blue

Step-by-step explanation: i am honestly just guessing dont come at me!!!

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2 years ago

Find the absolute value of complex number Z = 2+5

sasho [114]

The answer would be 7.

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4 years ago

What number is missing from the rule table

mr_godi [17]

C. 7. because if you divide the value for the missing term (take 28 for example) and divided it by the value of i (4) you will get 7. (28÷4=7)

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3 years ago

What is The Answer to 5% of 200

Genrish500 [490]

Answer: it 10 love

Step-by-step explanation:

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4 years ago

Read 2 more answers

What is a probability​ distribution?

What is a probability distribution?