8,918 Answered Questions for the topic statistics

Statistics

02/18/24

I need help sketching this equation

Sketch the region corresponding to the statement P(z>-0.9)
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Statistics

02/18/24

I need help with this question
A manufacture produces a commodity where the length of the commodity has approximately normal distribution with a mean of 14.6 inches and standard deviation of 0.7 inches if a sample of 43 items... more
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Statistics

02/18/24

I need help with this problem
A food marketing Institute found that 33% of household spend more than $125 a week on groceries assume the population proportion is 0.33 and a simple random sample of 412 households is selected... more
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Statistics

02/18/24

I need help with this problem
Assume that the readings at freezing on a patch of thermometers are normally distributed with a mean of 0°C, and a standard deviation of 1.00°C a single thermometer is randomly selected and tested.... more
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Statistics

02/18/24

I need help on this question

The heights of adult men in America are normally distributed with a mean of 69.4 inches and a standard deviation of 2.69 inches. The heights of adult women in America are also normally distributed,... more
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Statistics

02/18/24

Out of 500 people sampled, 235 preferred Candidate A. Based on this, estimate what proportion of the entire voting population

Out of 500 people sampled, 235 preferred Candidate A. Based on this, estimate what proportion of the entire voting population (p) prefers Candidate A.Use a 95% confidence level, and give your... more
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Statistics

02/18/24

A smart phone manufacturer is interested in constructing a 99% confidence interval

A smart phone manufacturer is interested in constructing a 99% confidence interval for the proportion of smart phones that break before the warranty expires. 91 of the 1578 randomly selected smart... more
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Statistics

02/18/24

How many parents do you have to sample?
You want to obtain a sample to estimate how much parents spend on their kids birthday parties. Based on previous study, you believe the population standard deviation is approximately o-= 64.7... more
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Statistics

02/18/24

How large of a sample size is required?
You want to obtain a sample to estimate a population mean. Based on previous evidence, you believe the population standard deviation is approximately o-=38.2. You would like to be 95% confident... more
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Statistics

02/18/24

How large of a sample size is required?
You want to obtain a sample to estimate a population proportion. Based on previous evidence, you believe the population proportion is approximately 89%. You would like to be 80% confident that your... more
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Statistics

02/18/24

How large of a sample size is required?
You want to obtain a sample to estimate a population proportion. Based on previous evidence, you believe the population proportion is approximately p = 0.38. You would like to be 95% confident that... more
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Statistics

02/18/24

what size of sample is needed? When finding the z-value, round it to four decimal places.
A political candidate has asked you to conduct a poll to determine what percentage of people support her. If the candidate only wants a 10% margin of error at a 99% confidence level, what size of... more
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Statistics

02/18/24

You would like to be 80% confident that you estimate is within 1.5% of the true population proportion. How large of a sample size is required?
You want to obtain a sample to estimate a population proportion. At this point in time, you have no reasonable preliminary estimation for the population proportion. You would like to be 80%... more
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Statistics

02/18/24

What size of sample is needed?

A political candidate has asked you to conduct a poll to determine what percentage of people support her. If the candidate only wants a 0.2% margin of error at a 99% confidence level, what size of... more
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Statistics

02/18/24

i need help with this question

Adult men have an average height of 69.0 inches with a standard deviation of 2.8 inches. Find the height of a man with a z-score of 3.39. Round your answer to one decimal place
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02/18/24

i'm doing a study as a high schooler trying to see the effect of 2 different types of essential oils on e.coli. i'm kind of stuck not knowing which statistical tests are most appropriate.
What I did was that I increased the concentrations of the oils from 10% to 20%, 30%, 40%, and 50%. I used the disk diffusion tests and measured the inhibition zones formed. I also had a positive... more
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Statistics Math Algebra 1 Algebra 2

02/18/24

business statistics

P(A)=0.47, P(B)=0.43, and P(A and B)=0.10P(B | A) =
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Statistics Math Algebra 1 Algebra 2

02/18/24

probability and business statistics
grades and genderA B C TOTALMALE 6 20 14 40FEMALE 8 10 9 27TOTAL 14 30 23 67d. If one student is chosen at random, find the probability that the student got a “B” GIVEN they are male
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02/17/24

Anyone looking for a Statistics, Data Science or Probability Tutor?
I am more than happy to help.
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Statistics

02/16/24

Could Someone Please Help Me Answer This Statistics Problem?
Consider the following example: Data on social media use was collected from a sample of college students. The average daily amount of social media use by this group was found to be 3.4 hours, with... more
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Statistics

02/14/24

Descriptive statistics
We are given a table for the city of Detroit, Michigan USA for the period of 1961 to 1973 with the following information: a column with the number of full-time police per 100,000 citizens and a... more
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Statistics

02/14/24

The graph illustrates the distribution of test scores taken by College Algebra students. The maximum possible score on the test was 130, while the mean score was 70 and the standard deviation was 13.
31 44 57 70 83 96 109(distribution of test scores)What is the approximate percentage students who scored between 57 and 83 on the test?What is the approximate percentage of students who... more
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Statistics

02/12/24

empirical rule-standard deviation
Suppose that diastolic blood pressure readings of adult males have a bell-shaped distribution with a mean of 82 mmHg and a standard deviation of 12 mmHg. Using the empirical rule, what percentage... more
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Statistics Computer Science

02/12/24

The Orange data frame from datasets...
Using the dataset Orange from R can help solve this question.Part c)According to the model, what is the estimate of the mean of circumference 𝑌 for a tree of age 𝑥 = 900. That is, find 𝜇̂ 𝑌|𝑥=900=... more
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Statistics Computer Science

02/12/24

Rather than using the test statistic...
A company that sells its product on their website would like to improve the sales by making the webpage with product info more attractive. Current version (call it version A) and a new version... more
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