8,918 Answered Questions for the topic statistics

Statistics R

05/07/23

How to use a Linear Mixed Models (LMMs) to compare a fixed factor with 3 levels, which differ in size
I want to run an LMM with a 3-level fixed factor "block_condition" (levels: A,B,C) and 2-level block_number (1,2). SubjectID was also added as a random factor to the model.Now the problem is that I... more
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Statistics

05/06/23

Find probability
Suppose that about 85% of graduating students attend their graduation. A group of 22 graduating students is randomly chosen.Find the probability that 19 or 20 attend. (Round your answer to four... more
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Statistics

05/06/23

Find the probability

A school newspaper reporter decides to randomly survey 17 students to see if they will attend Tet festivities this year. Based on past years, she knows that 12% of students attend Tet festivities.... more
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Statistics

05/06/23

Find the probability

A school newspaper reporter decides to randomly survey 14 students to see if they will attend Tet festivities this year. Based on past years, she knows that 23% of students attend Tet festivities.... more
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Statistics

05/06/23

Find probability

Suppose that about 85% of graduating students attend their graduation. A group of 22 graduating students is randomly chosen.Find the probability that 19 or 20 attend. (Round your answer to four... more
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Statistics

05/06/23

Find probability

Suppose that about 85% of graduating students attend their graduation. A group of 22 graduating students is randomly chosen.Find the probability that 19 or 20 attend. (Round your answer to four... more
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Statistics

05/06/23

Find the probability

At The Fencing Center, 60% of the fencers use the foil as their main weapon. We randomly survey 29 fencers at The Fencing Center. We are interested in the numbers that do not use the foil as their... more
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Statistics Math Probability

05/05/23

How many ways are there to pull 7 cards from a standard deck with the first four being red, the last three being black, and no two ranks can be the same?
Every card has to have a unique rank. the first four cards must be red, and the last three cards must be black. This is a counting problem that does not require any combinations or permutations.
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Statistics Math

05/05/23

What is the best predicted weight of a bear with a chest size of 39 ​inches? The best predicted weight for a bear with a chest size of 39 inches is enter your response here pounds.
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Statistics

05/05/23

statistics question
Is there a doctor in the house? A market research firm reported the mean annual earnings of all family practitioners in the United States was . A random sample of  family practitioners in Los... more
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Statistics

05/05/23

Find a 90% confidence interval for 𝜎2.  (Round your answers to three decimal places.)
the EPA limit on the allowable discharge of suspended solids into rivers and streams is 60 milligrams per liter (mg/l) per day. A study of water samples selected from the discharge at a phosphate... more
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Statistics

05/05/23

Sampling Distributions and Central Limit Theorem
The sampling distribution of sample means is from a highly skewed population with µ = 4.47 and σ = 1.40. For repeated random samples of size 100 from this population:a) Find the mean and standard... more
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Statistics

05/04/23

Need more help for statistics
Assume body temperatures of adults are normally distributed. Based on this data, find the 80% confidence interval of the mean body temperature of adults in the town. Enter your answer as... more
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Statistics

05/04/23

confidence interval
A botanist wishes to estimate the typical number of seeds for a certain fruit. She samples 52 specimens and counts the number of seeds in each. Use her sample results (mean = 47.3, standard... more
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Statistics

05/04/23

If there was 989 pedestrian deaths that were cause by automobile accidents

The Table summarizes results from 989 pedestrian deaths that were caused by automobile accidents. If 1 of the pedestrian deaths is randomly selected find the probability that neither the pedestrian... more
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Statistics

05/02/23

what is the 90% confidence interval for chi squared
The EPA limit on the allowable discharge of suspended solids into rivers and streams is 60 milligrams per liter (mg/l) per day. A study of water samples selected from the discharge at a phosphate... more
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Statistics Probability

05/02/23

Find the probability
In a study of brand recognition, 1106 consumers knew of Exxon, and 2 did not. Use these results to estimate the probability that a randomly selected consumer will recognize Exxon.Report the answer... more
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Statistics Probability

05/02/23

Suppose we collect a random sample 27 rabbits and weigh them. We find that among these 27 rabbits, the average weight is 1.7 pounds with a standard deviation of 0.44 pounds.
Suppose we collect a random sample 27 rabbits and weigh them. We find that among these 27 rabbits, the average weight is 1.7 pounds with a standard deviation of 0.44 pounds. (a) Construct a 90%... more
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Statistics

05/01/23

please help explain this.

A hospital reported that the normal death rate for patients with extensive burns (more than 40% of skin area) has been significantly reduced by the use of new fluid plasma compresses. Before the... more
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Statistics

05/01/23

two bus lines/arrival times

A comparison is made between two bus lines to determine if arrival times of their regular buses from Denver to Durango are off schedule by the same amount of time. For 51 randomly selected runs,... more
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Statistics Probability

04/30/23

Expectation with exponential distribution
Suppose I arrive at a cafe with 3 baristas. All 3 baristas are busy but no one is in the queue. So I’ll wait until one of the baristas finish serving their current customer and then give my order... more
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Statistics

04/30/23

student lounge coffee
A machine in the student lounge dispenses coffee. The average cup of coffee is supposed to contain 7.0 ounces. A random sample of nine cups of coffee from this machine show the average content to... more
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Statistics

04/30/23

laboratory exercises

How strong a force (in pounds) is needed to pull apart pieces of wood 4 inches long and 1.5 inches square? The following are data from students performing a comparable laboratory exercise. Suppose... more
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Statistics

04/29/23

What percentage of people in this profession earn annual salaries between $54,000 and $57,000? Round your result to one decimal place
The annual salaries for people in a particular profession are known to be normally distributed with a mean of $54,800 and a standard deviation of $2,600.What percentage of people in this profession... more
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Statistics

04/28/23

Answer question

Which is more likely, randomly selecting one male basketball player who is 79 inches (6’7”) tall or randomly selecting a team of five players that is 79 inches tall
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