8,955 Answered Questions for the topic statistics

Statistics Probability

12/13/21

A test was given to a group of students. The grades and major are summarized below. (New to this so full questions is uploaded to this screenshot) https://prnt.sc/22v7ooq
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Statistics Math

12/13/21

Statistics standard deviation
Employees at XYZ company work at an average of 55 hours per week with the standard deviation of 9 hours. Promotions are more likely for those employees in the upper 10% of the time they spend... more
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Statistics

12/12/21

Lower/Upper Limit, Margin of error, Sampe Size.

question What price do farmers get for their watermelon crops? In the third week of July, a random sample of 40 farming regions gave a sample mean of  = $6.88 per 100 pounds of watermelon. Assume... more
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Statistics Test Preparation Test

12/11/21

test USED for two variables
what type of test would be use for IV days of poor mental health, and DV hours spent on the web?
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Statistics

12/09/21

Hypothesis Test For Multiple Population Proportions
Consumer Reports took a survey of users of two major mobile phone companies. They asked if the individuals were satisfied with their phone service. Consider the following... more
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Statistics

12/09/21

Statistics Problem

A group of foreign students formed a club. In total there were 12 Germans, 8 French, 6 Spanish and 6 Italian. A team of 5 students was going to be randomly selected to participate in a University... more
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Statistics

12/09/21

Statistics Question
A company took a survey asking the employees if they were satisfied with the health Coverage package provided. Of 200 employees surveyed 124 responded YES The 90% CI for the YES is between 56.5 to... more
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Statistics

12/09/21

Statistics Problem

A car manufacturer is estimating the average gasoline consumption for a new car (mpg). A sample of 100 cars provides the following results (use alpha = 0.05)n = 100 x bar = 27 mpg S^2 + 36Can they... more
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Statistics

12/09/21

Statistics Problem

A hotel in South Beach has 30 rooms to rent. The probability for each room to be rented for the next weekend is 0.90. What is the prob that exactly 23 rooms will be rented? ANSWER = .018ANother... more
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Statistics Math Algebra 1 Algebra 2

12/09/21

Need help with Statisitcs.
The weights of adult tuna are normally distributed with a mean of 90 lbs and an standard deviation of 20 lbs. If you catch an adult tuna, what is the probability that it weighs less than 70... more
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Statistics

12/09/21

consider the following data
Consider the following data set consisting of test scores of students in a math class: 5 11 26 56 57 58 61 62 63 63 66 67 68 71 71 71 71 72 72 72 74 79 80 81 84 85 91 a. Obtain the... more
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Statistics

12/09/21

Assume the standard deviation
If a one-person household spends an average of $56 per week on groceries, find the maximum and minimum amounts spent per week for the middle 50% of one-person households. Assume the standard... more
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Statistics Biology

12/09/21

What statistical test should I use to analyze this type of data?
What statistical test do I use based on the following information? Additionally, how would I set up the data (like in a chart).I am observing three different hunting behaviors found in a cat... more
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Statistics Math

12/08/21

Math: Introduction to Statistics Question
Solve For: For a normal distribution, assume the 'population' standard deviation is 14.7. What is the maximal margin of error associated with a 95% confidence interval for the true population mean... more
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Statistics

12/07/21

Hypothesis testing need answer please
An engineering company wants to have a hypothesis test on its certain type of products. A quality control engineer measures the strength of 16 sample products of that type, and computes a sample... more
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Statistics

12/06/21

What is the formula for this?
X follows a beta distribution with parameters alpha=5 and beta=2. What is V(X)?
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Statistics

12/06/21

A researcher wants to find an 80% confidence interval for the mean commute time for CBC students.

From similar studies at other community colleges, the researcher estimates the standard deviation of the study will be around s = 17.5 minutes. If they want the maximum error to be 4 minutes,... more
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Statistics Probability

12/05/21

Help me find the probability this man’s weight please
Noel, a 35 year old office worker, has been struggling with his weight for a long time. He is looking to start dating again, so earlier this year he decided to join a gym. A few days ago he noted... more
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Statistics

12/04/21

What is the formula for calculating this?
X follows a beta distribution with parameters alpha=5 and beta=2. What is V(X)?
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Statistics

12/04/21

confidence interval
Express the confidence interval 213.6<μ<313 in the form of ¯x±ME.
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Statistics

12/04/21

ITS LIKE ALIEN LANGUAGE HELP PLEASE
The effectiveness of a blood-pressure drug is being investigated. An experimenter finds that, on average, the reduction in systolic blood pressure is 50.5 for a sample of size 735 and standard... more
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Statistics

12/03/21

The results on a final exam given by a university professor are normally distributed with a mean of 65.3% and a standard deviation of 8.5.
The results on a final exam given by a university professor are normally distributed with a mean of 65.3% and a standard deviation of 8.5. A student with a mark of 70% on the exam justified it to... more
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Statistics

12/03/21

It is estimated that 10% of the vehicles entering Canada from the United States carry undeclared goods.

It is estimated that 10% of the vehicles entering Canada from the United States carry undeclared goods. Assuming the data can be modelled using a normal approximation, determine the probability... more
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Statistics Math

12/03/21

Given 𝑿 is a normally distributed random variable with a mean of 155 and a standard deviation of 11.6, determine
Given 𝑿 is a normally distributed random variable with a mean of 155 and a standard deviation of 11.6, determine A) 𝑷(𝑿>170) B) 𝑷(𝟏𝟓𝟐<𝑋<170)
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Statistics

12/03/21

Sketch a graph of a distribution that is positively skewed and state a real life example of when a positively skewed distribution would exist.
Sketch a graph of a distribution that is positively skewed and state a real life example of when a positively skewed distribution would exist.
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