8,918 Answered Questions for the topic statistics

Statistics

03/05/22

How many outcomes are there in the sample space of this experiment?
A system is composed of 5 components (A, B, C, D, E), each of which is either working or defective. Consider an experiment that consists of observing the status of each component, and let the... more
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Statistics

03/05/22

Normal distribution

The amount of money spent weekly on cleaning, maintenance, and repairs at a large restaurant was observed over a long period of time to be approximately normally distributed, with mean 𝜇 = $613 and... more
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Statistics

03/05/22

Probability of binomial

According to Harper's Index, 40% of all federal inmates are serving time for drug dealing. A random sample of 20 federal inmates is selected.(a) What is the probability that 13 or more are serving... more
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Statistics

03/05/22

binomal distribution probability
A research team conducted a study showing that approximately 20% of all businessmen who wear ties wear them so tightly that they actually reduce blood flow to the brain, diminishing cerebral... more
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Statistics

03/05/22

Would you expect distribution of the data to be symmetric, skewed to the right, or skewed to the left?

During a recent semester at a school, students having accounts on a main frame computer had hard drive use (in kilobytes) described by the five-number summary, minimum = 4, Q1 = 256, median =... more
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03/04/22

How many days did it take the patient to recover?
If the recovery time for a surgery is normally distributed with a mean of 6.1 days and a standard deviation of 2.5 days. And the z-score for a recovery time is -1.45, how many days did the patient... more
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Statistics

03/04/22

I decided to make a CD with all with 8 of my 15 favorite math songs. How many different arrangements of the 8 songs are possible?
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Statistics Probability

03/04/22

The middle value under the normal curve is always 0
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03/04/22

I'm stuck on the latter part of this equation, for some reason I got a 12 for the .4 proportion when I attempted to standardize it. This does not correlate with my z distribution chart. Thanks!
Based on historical data, your manager believes that 25% of the company's orders come from first-time customers. A random sample of 224 orders will be used to estimate the proportion of... more
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Statistics Probability

03/04/22

The amount of time to complete a physical activity in a PE class is approximately normally normally distributed with a mean of 38.2 seconds and a standard deviation of 6.7 seconds.
a) What is the probability that a randomly chosen student completes the activity in less than 31.9 seconds? b) What is the probability that a randomly chosen student completes the activity in more... more
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Statistics Probability

03/03/22

Solving problems involving permutations

A Grade 12 student is taking Biology, English, Math and Physics in her first term. If a student timetable has five courses, how many ways can she schedule her course?
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Statistics Psychology Spss

03/03/22

When should you use an ANOVA statistical design?

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Statistics

03/01/22

Statistics question
A national achievement test is administered annually to 3rd graders. The test has a mean score of 100 and a standard deviation of 7. If James z - score is 1.20and John got 84on the test answer the... more
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Statistics

03/01/22

ssr=7,296.14 and sse=285.07, compute r^2
how would i do this problem?
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Statistics

03/01/22

The standard error of sample mean is
The standard error of the sample mean isA.) the standard deviation of the means of randomly drawn samples from the population.B.) the range of values above and below the sample statistic in a... more
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Statistics Probability

02/28/22

A lottery offers five Php 1000, two Php 5,000, and one Php 10,000. One Thousand tickets are sold at Php 30 each. Find the expectation if a person buys one ticket.
Mean and Variance of the given myu=E[ x times P(x)]
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Statistics Probability

02/28/22

A lottery offers five Php 1000, two Php 5,000, and one Php 10,000. One Thousand tickets are sold at Php 30 each. Find the expectation if a person buys one ticket.
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Statistics

02/28/22

what is the z value

According to a 2009 Reader's Digest article, people throw away about 11% of what they buy at the grocery store. Assume this is the true proportion and you plan to randomly survey 199 grocery... more
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Statistics

02/28/22

what is the Z value

A Food Marketing Institute found that 32% of households spend more than $125 a week on groceries. Assume the population proportion is 0.32 and a simple random sample of 178 households is selected... more
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Statistics

02/28/22

what is the z value ?
Based on historical data, your manager believes that 30% of the company's orders come from first-time customers. A random sample of 115 orders will be used to estimate the proportion of first-time... more
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Statistics

02/28/22

mean and standard error
Suppose the true proportion of voters in the county who support a specific candidate is 0.58. Consider the sampling distribution for the proportion of supporters with sample size n = 135.What is... more
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Statistics

02/28/22

What is the probability that the sample proportion is greater than 0.26?
Based on historical data, your manager believes that 27% of the company's orders come from first-time customers. A random sample of 56 orders will be used to estimate the proportion of first-time... more
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Statistics

02/28/22

If n=15, x-bar=32, and s=6 find the margin of error at a 80% confidence level

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Statistics Probability

02/27/22

Incidence Rate for an Event
Hi,I'm unsure whether I'm oversimplifying this problem.A zoo records 94,000 visits annually from the residents of a particular region. The region has a population of 67,000 inhabitants. From this,... more
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Statistics

02/27/22

Please help answer
On a planet far far away from Earth, IQ of the ruling species is normally distributed with a mean of 107 and a standard deviation of 16. Suppose one individual is randomly chosen. Let X = IQ of an... more
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