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Statistics

01/06/23

Enter the probability as a fraction. P(at least one green) =

Suppose that you have 9 cards. 4 are green and 5 are yellow. The 4 green cards are numbered 1, 2, 3, and 4. The 5 yellow cards are numbered 1, 2, 3, 4, and 5. The cards are well shuffled. Suppose... more

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Statistics

01/04/23

Standard Normal Distribution

In a mid-size company, the distribution of the number of phone calls answered each day by each of the 12 receptionists is bell-shaped and has a mean of 60 and a standard deviation of 3. Using the... more

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Statistics

01/04/23

standard normal distribution

A company has a policy of retiring company cars; this policy looks at the number of miles driven, the purpose of trips, the style of the car, and other features. The distribution of the number of... more

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Statistics

01/04/23

Continous uniform distribution

The duration of a professor's class has a continuous uniform distribution between 50.0 minutes and 52.0 minutes. If one class is randomly selected, find the probability that the professor's class... more

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Statistics

01/03/23

intro to stats help

The uniform distribution of a random variable XX is given in the figure below..From the figure, what is P(X≥1.26)P(X≥1.26)?

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Statistics

01/02/23

intro to stats help!!!

A random experiment involves drawing a sample of 12 data values from a normally distributed population. The random variable is the z-score of the minimum of the data... more

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Statistics Probability

01/01/23

Probability of hearing about someone for the first time on the exact day they die

On the 31 December 2022, for the first time in my life, I heard about a celebrity, Anita Pointer of the Pointer Sisters. I woke up the next day, checked the news and saw she had died they day... more

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Statistics

12/31/22

getting confused

We want to conduct a hypothesis test of the claim that the population mean germination time of strawberry seeds is different from 18.1 days. So, we choose a random sample of strawberries.... more

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Statistics

12/31/22

I want to confirm if my answer is correct

1- The records of a computer retail store show that out of the 100 customers who purchased a desktop computer last month, all but 28 also purchased a service plan that extends the... more

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Statistics

12/26/22

When will we get a labrador dog

Labrador dog, which year, which day and date. Will we be happy?

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Statistics Econometrics

12/25/22

Panel data and Standard Error

I currently have a set of panel data pertaining to a certain set of companies with a filters like minimum market cap, revenue size etc. If I expand this dataset by adding data about companies which... more

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Statistics

12/21/22

An electronic product takes an average of 3hours to move through an asset line. If the standard deviation is 0.6 hours , what’s the probability that an item will take between 3 and 4.8 hours to move

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Statistics

12/20/22

A researcher selects a sample using a list of possible subjects. She uses a random number to select the first subject, and then selects every tenth subject on the list. What is this an example of?

A systematic sampleA cluster sampleA stratified sampleA multistage sampleA simple random sample (SRS)

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Statistics

12/19/22

the probability mass function of a random variable X is given by pr(x)=cµ^2/x! x=1,2,3.where µ is some positive value .find the constant c. (1)p(x>2) .(2)pr(x=0)

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Statistics

12/18/22

The area that lies between z=-1.08 and z=- 1.53

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Statistics Biostatistics

12/17/22

When taking a certain drug 8.5% experience nausea as a side effect.

A scientist took a random sample of 1102 individuals who were taking the drug and recorded the sample proportion who experienced nausea as a side effect, ˆp. Assume the sampling distribution... more

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Statistics Biostatistics

12/17/22

A population of values has a normal distribution with μ = 135.4 and σ = 80.7. You intend to draw a random sample of size n = 12 .

-Find the probability that a single randomly selected value is less than 207.6. P(X < 207.6) =-Find the probability that a sample of size n=12n=12 is randomly selected with a mean less than... more

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Statistics

12/16/22

Ten pairs of data yield r = 0.92 and the regression equation y^=8x+3. Also, y¯=−3.2 What is the best predicted value of y for x=7 ?

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Statistics Math Probability

12/15/22

The mean percent of childhood asthma prevalence in 43 cities is 2.14%. A random sample of 31 of these cities is selected.

The mean percent of childhood asthma prevalence in 43 cities is 2.14%. A random sample of 31 of these cities is selected. What is the probability that the mean childhood asthma prevalence for the... more

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Statistics Sas

12/14/22

Graphing a linear relationship with a categorical variable

Should a bar graph or a box plot be used if the group variable or the y variable is categorical and the dependent variable or outcome is continuous?

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Statistics

12/14/22

If n=330 and p-hat=0.5, construct a 90% confidence interval

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Statistics

12/13/22

Statistics and Probability - tossing a coin

Two fair coins are to be tossed and the outcome is the ordered pair (face on the first coin, face on the second coin). Let the face “tail” be denoted by T and let the face “head” be denoted by H.... more

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Statistics Math

12/13/22

Calculate the mean absolutee deviation (MAD) MAD= 2+3+4+4+4+5+5+6+6+6+7+8

I am im 7th grade and this is what we are doing in class. I have tried multiple times and the MAD does not make sense.

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Statistics Math

12/13/22

Calculate the mean absolutee deviation (MAD) MAD= 2+3+4+4+4+5+5+6+6+6+7+8

I am im 7th grade and this is what we are doing in class. I have tried multiple times and the MAD does not make sense.

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Statistics Econometrics Probability

12/13/22

Basic concept in statistical inference

Determine tge area under the standard normal probability distribution fir tge following values:(a) z ≤ 2.0;(b) z≥ 0.0;(c) between z= 0.0 and z= 2.0;(d) between z= 0.8 and z= 3.0

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Enter the probability as a fraction. P(at least one green) =

Standard Normal Distribution

standard normal distribution

Continous uniform distribution

intro to stats help

intro to stats help!!!

Probability of hearing about someone for the first time on the exact day they die

getting confused

I want to confirm if my answer is correct

When will we get a labrador dog

Panel data and Standard Error

An electronic product takes an average of 3hours to move through an asset line. If the standard deviation is 0.6 hours , what’s the probability that an item will take between 3 and 4.8 hours to move

A researcher selects a sample using a list of possible subjects. She uses a random number to select the first​ subject, and then selects every tenth subject on the list. What is this an example​ of?

the probability mass function of a random variable X is given by pr(x)=cµ^2/x! x=1,2,3.where µ is some positive value .find the constant c. (1)p(x>2) .(2)pr(x=0)

The area that lies between z=-1.08 and z=- 1.53

When taking a certain drug 8.5% experience nausea as a side effect.

A population of values has a normal distribution with μ = 135.4 and σ = 80.7. You intend to draw a random sample of size n = 12 .

Ten pairs of data yield r = 0.92 and the regression equation y^=8x+3. Also, y¯=−3.2 What is the best predicted value of y for x=7 ?

The mean percent of childhood asthma prevalence in 43 cities is 2.14​%. A random sample of 31 of these cities is selected.

Graphing a linear relationship with a categorical variable

If n=330 and p-hat=0.5, construct a 90% confidence interval

Statistics and Probability - tossing a coin

Calculate the mean absolutee deviation (MAD) MAD= 2+3+4+4+4+5+5+6+6+6+7+8

Calculate the mean absolutee deviation (MAD) MAD= 2+3+4+4+4+5+5+6+6+6+7+8

Basic concept in statistical inference

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A researcher selects a sample using a list of possible subjects. She uses a random number to select the first subject, and then selects every tenth subject on the list. What is this an example of?

The mean percent of childhood asthma prevalence in 43 cities is 2.14%. A random sample of 31 of these cities is selected.