8,918 Answered Questions for the topic statistics

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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Statistics

12/03/21

When correlation is not established, what is the best predicted value of the response variable?
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Statistics

12/03/21

Determine whether each of the following binomial distributions can be approximated using a normal distribution.

Determine whether each of the following binomial distributions can be approximated using a normal distribution.A) 𝑛=50 B) 𝑛=40 𝑝 = 0.4 ... more
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Statistics

12/03/21

Determine the mean of a set of a normally distributed data with a standard deviation
Determine the mean of a set of a normally distributed data with a standard deviation of 4 and a 𝒛-score of 1.5 when 𝑥 = 73.
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Statistics

12/03/21

Rewrite the following probabilities with a continuity correction.
Rewrite the following probabilities with a continuity correction.A) 𝑷(𝑿>170) B) 𝑷(−𝟐≤𝑿<7)
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Statistics

12/03/21

Statistics, standard deviation, mean, and z score
the local police force gives all applicants an entrance exam and accepts only those applicants who score is the top 1.5% on teh test. Assuming the scores are normally distributed, the mean score is... more
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Statistics

12/02/21

Company XYZ know that replacement times for the quartz time pieces it produces are normally distributed with a mean of 14 years and a standard deviation of 2 years.
If the company wants to provide a warranty so that only 1.3% of the quartz time pieces will be replaced before the warranty expires, what is the time length of the warranty?warranty = ____yearsWhat... more
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Statistics

12/02/21

A distribution of values is normal with a mean of 42.3 and a standard deviation of 49.1. Find P42, which is the score separating the bottom 42% from the top 58%.
This has me 100% lost. I am not sure where to even start.
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Statistics

12/02/21

A particular fruit's weights are normally distributed, with a mean of 493 grams and a standard deviation of 17 grams. The heaviest 19% of fruits weigh more than how many grams?
I am confused as to what the percentage represents and how that helps me.
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Statistics Probability

12/02/21

what is the probability that the sum of the dices is 4 ?
in an experiment, a ball is drawn from a box containing 7 green balls and 10 orange balls. if the ball is green, two dice are rolled. if the ball is orange, three dices are rolledwhat is the... more
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Statistics

12/02/21

Probability and States
1.     Suppose you have 2 duffel bags, each containing $1000 casino chips, some from Caesar's Palace and some from Harrah's (and nothing from anywhere else). In both bags 40% are real and the rest... more
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Statistics

12/02/21

Probability and Stats
1.     With replacement and a normal deck, no jokers, show how to calculate the probability of the following: a.     drawing a king and an ace on two drawsb.     drawing a 2 or a 3 on either of two... more
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