8,919 Answered Questions for the topic statistics

Statistics

10/26/22

When two dices are rolled at once, what would be the sum greater than or equal to 4?

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Statistics Probability

10/26/22

What is the probability that the first marble is red and the second is green?

There is a bag of marbles. Inside the bag there are 10 blue marbles, 6 red marbles and 5 green marbles. Two marbles are selected from the bag without replacement. What is the probability that the... more
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Statistics

10/26/22

If n=17, ¯ x x ¯ (x-bar)=32, and s=3, find the margin of error at a 98% confidence level
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Statistics Math

10/25/22

Calculate the shaded area under the curve
The shelf life of a batteries produced by one major company are normally distributed with a mean of 4.9 years and a standard deviation of 1 years. The figure below shows the distribution of shelf... more
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Statistics

10/25/22

pleaseeeeeeeeeeeeeeeeeeeee
We wish to estimate what percent of adult residents in a certain county are parents. Out of 400 adult residents sampled, 288 had kids. Based on this, construct a 99% confidence interval for the... more
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Statistics

10/24/22

why is alternative hypothesis said to be “supported” but not said to be “proven”?

Is it because of the statistical procedure to prove statement or is it the bid involved in supporting certain confidence? Thanks
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Statistics

10/24/22

Probability lung cancer (statistics)
Approximately 1 percent of Americans ages 50-60 have lung cancer. A patient with lung cancer has a 87 percent chance of a positive test. A patient without lung cancer has a 9 percent chance of a... more
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Statistics

10/24/22

Polling organization probability 
A polling organization randomly selects an adult American for a survey about credit card usage. Suppose 47% of the population is male. Suppose 9.8% of males smoke cigars and 1.04% of females smoke... more
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Statistics Math Probability

10/23/22

Given a situation that x can be any number between 4 and 30 that is divisible by 3, what value of x can be added to the data set 4, 8, 10, 20, and 30 to get a mean of 15? explai
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Statistics

10/23/22

Distribution of sample means
For a normal population with a mean of 100 and a standard deviation of 20, for a sample of n=25, what is the probability that the sample mean will be within 5 points of the population mean?
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Statistics Econometrics

10/22/22

Econometrics Question
Determine the sign of the expected bias introduced by omitting a relevant variable. State your assumptions and provide a very brief rationale for your assumptions.We plan to estimate the following... more
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Statistics Math Econometrics

10/22/22

Econometrics help
Determine the sign of the expected bias introduced by omitting a relevant variable. State your assumptions and provide a very brief rationale for your assumptions.We plan to estimate the following... more
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Statistics Econometrics

10/22/22

Econometrics Problem
Determine the sign of the expected bias introduced by omitting a relevant variable. State your assumptions and provide a very brief rationale for your assumptions.We plan to estimate the following... more
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Statistics Econometrics

10/22/22

Econometrics Word Problem, see description
Suppose that you work for a company that produces and sells bicycle helmets. Your boss has asked you to determine the own-price elasticity of demand for helmets. That is, you’ve been asked to... more
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Statistics Econometrics

10/22/22

Econometrics Question, see description (was too long)
Determine the sign of the expected bias introduced by omitting a relevant variable. State your assumptions and provide a very brief rationale for your assumptions.We plan to estimate the following... more
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Statistics

10/22/22

If n=600 and p' (p-prime) = 0.82, construct a 95% confidence interval.
If n=600 and p' (p-prime) = 0.82, construct a 95% confidence interval.Give your answers to three decimals. < p < 
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Statistics

10/22/22

May I get help on this please?
A man claims to have extrasensory perception (ESP). As a test, a fair coin is flipped 20 times, and the man is asked to predict the outcome in advance. He gets 18 out of 20 correct. What is the... more
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Statistics

10/22/22

If x is a binomial random variable, compute P(x) for each of the following cases
P(x<or=3), n=8, p=0.4P(x)=?P(x>3), n=8, p=0.3P(x)=?P(x<1), n=8, p=0.3P(x)=?P(x>or=7), n=9, p=0.3P(x)=?
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Statistics

10/22/22

May I get help on this?

A quiz consists of 10 multiple-choice questions, each with 6 possible answers. For someone who makes random guesses for all of the answers, find the probability of passing if the minimum passing... more
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Statistics

10/22/22

If n=10, ¯ x (x-bar)=48, and s=17, construct a confidence interval at a 95% confidence level. Assume the data came from a normally distributed population.
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Statistics

10/22/22

Can I get help on this please? I'm not getting this.
Suppose it is believed that the probability a patient will recover from a disease following medication is 0.8. In a group of twenty such patients, the number who recover would have mean and... more
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Statistics

10/22/22

Suppose that you flip a coin 15 times. What is the probability that you achieve at least 6 tails?
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Statistics

10/22/22

Am I able to get help with this? I kept trying and I'm not getting it.
In the United States, voters who are neither Democrat nor Republican are called Independent. It is believed that 11% of voters are Independent. A survey asked 35 people to identify themselves as... more
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Statistics

10/21/22

If a candidate only wants a 2% margin of error at a 90% confidence level, what size of sample is needed?
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Statistics

10/21/22

elementary statistics

The random variable xx represents the number of received at a help desk in one hour, and it has a Poisson distribution with a mean of 15.6.What is the variance?variance = What is the standard... more
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