8,918 Answered Questions for the topic statistics

Statistics Writing

02/06/25

What does "motivating" a hypothesis mean in dissertation writing? What are some best practices to theoretically frame my hypothesis(es) for scholarship, a presentation, and/or a journal?
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Statistics

01/23/25

We want to conduct a hypothesis test of the claim that the population mean score on a nationwide examination in anthropology is different from . So, we choose a random sample of exam scores
We want to conduct a hypothesis test of the claim that the population mean score on a nationwide examination in anthropology is different from 502. So, we choose a random sample of exam scores. The... more
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Statistics

01/21/25

AP Statistics probability question - Sampling Distributions
Are college students who take a freshman orientation course more or less likely to stay in college than those who do not take such a course? A study revealed that 67% of students who enrolled in an... more
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Statistics

01/04/25

What is a confidence interval in Statistics?
Please explain, using an example, what a confidence interval is and how we would apply it to sample scenario.
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Statistics Probability

12/16/24

Urn 1 and Urn 2
Urn 1 contains two white balls and one black ball, while urn 2 contains one white ball and five black balls. One ball is drawn at random from urn 1 and placed in urn 2. A ball is then drawn from... more
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Statistics

12/10/24

Statistise on Confidence intervals and Hypothesis testing
To study the average rating of chess players at a tournament, we have a random sample of 360 players. The sample mean is 1660 and the true standard deviation is σ = 360. a. Construct an approximate... more
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Statistics Math

12/03/24

Hypotheses Testing
You want to see if the proportion of the population that wants the government to enact stronger measures to counteract climate change is different between those under 40 and those 40 and over. You... more
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Statistics Psychology

11/29/24

What's the difference between a z test and a t test?
What do both require, and why do we rarely use z tests?
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Statistics

11/27/24

session recordings after 1 month
How can I access my session recordings after 1 month
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Statistics Math

11/26/24

Hypotheses Testing
A recent poll stated that out of the 40 people interviewed, 22 of them drove to work. Create a 95% confidence interval for the true percentage of people who drive to work. Pick the correct... more
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Statistics Math

11/26/24

Hypothesis Testing
Suppose a machine produced wooden blocks. The machine is not entirely accurate so the blocks come out with a known standard deviation of 2cm regardless of what length the machine is set to cut. I... more
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Statistics Math

11/26/24

Hypotheses Testing
Before Covid, a census of the Region stated that the average salary of working adults was $50,000. I want to see if this number has changed. I go out and randomly choose 40 people from the area. I... more
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Statistics

11/23/24

Confidence Intervals
A recent poll stated that out of the 40 people interviewed, 22 of them drove to work. Create a 95% confidence interval for the true percentage of people who drive to work. Assume the data are... more
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Statistics

11/06/24

Statistics Help
An LG Dishwasher, which costs $700, has a 17% chance of needing to be replaced in the first 2 years of purchase. A two-year extended warrantee costs $112.10 on a dishwasher. Assume the dishwasher... more
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Statistics

11/06/24

Statistics Help
An LG Dishwasher, which costs $750, has a 15% chance of needing to be replaced in the first 2 years of purchase. A two-year extended warrantee costs $112.10 on a dishwasher. Assume the dishwasher... more
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Statistics

11/05/24

Normal Distribution
Suppose the heights of a certain type of tree is normally distributed with a mean of 10m and a standard deviation of 2ma) What is the probability a randomly chosen tree is between 9.6m and 10.2m?b)... more
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Statistics

11/05/24

Central Limit Theorem
The temperature in a freezer is uniformly distributed between -6 and -4 Celsius.a)What is the probability a single temperature reading is above -5.2 Celsiusb)The probability the average of 50... more
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Statistics

11/05/24

Normal Distribution
Sometimes we can model the binomial distribution using the normal distribution if the number of trials is large enough. Use this to answer the following question: If I flip a coin 300 times, what... more
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Statistics

11/04/24

Stats bases on Bayes theorem
People with the disease D have a 90% probability of testing positive on the D-test. If they do not have disease D, they have a 99% probability that they will test negative. We know that 4% of all... more
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Statistics

11/04/24

stats module 6 homework question 12 urgent help please I am so confused

A company creates wooden furniture to be sold at various retailers. This company claims that only 2.24% of their furniture are defective in some manner. Monica would like to test this claim to see... more
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Statistics

11/04/24

stats module 6 homework question 16 urgent help please

A survey of randomly selected university students found that 95 of the 109 first-year students and 100 of the 137 second-year students surveyed had purchased used textbooks in the past year.(a)... more
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Statistics

11/04/24

stats module 6 homework question 15 please help

A computer manufacturing company produces 2 products: desktop computers and laptops. The quality controller wants to see if the proportion of defective desktop computers is higher than the... more
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Statistics Math

11/04/24

stats module 6 homework question 17

An SRS of 150 flights of a large airline (call this airline 1) showed that 129 were on time. An SRS of 150 flights of another large airline (call this airline 2) showed that 139 were on time.... more
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Statistics

11/04/24

Stats module 6 homework question

A poll reported that 31% of 130 Canadians between the ages of 25 and 29 had started saving money for retirement. Of the 140 Canadians surveyed between the ages of 21 and 24, 25% had started saving... more
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Statistics

10/31/24

Confidence Intervals
An instructor wants to estimate the proportion of students that takeadvantage of free math tutoring offered by their college.Out of a random sample of 4800 students, 2256 use the free math... more
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