If the number of dust particles in a square meter on a surface follows a Poisson distribution with a mean of 28900 particles, what are the variance and standard deviation of the number of dust particles.

Q: If a population has a mean of 228.8 and a standard deviation of 35.5 then a sampling distribution…

A: Given that, mean is 228.8 and standard deviation is 35.5. We will use z-standard normal…

Q: If a population has a standard deviation σ of 36 units, what is the standard error of the mean if…

A: The population standard deviation is 36.

Q: Suppose the platelet count of such patients with dengue fever follows a normal distribution with a…

A: Suppose the platelet count of such patients with dengue fever follows a normal distribution with a…

Q: If a set of data is normally distributed with a mean of 50 and a standard deviation of 5, a z-score…

A:

Q: The two types of variance that can occur in our data are A. Independent and dependent

A: Hello! As you have posted 2 different questions, we are answering the first question. In case you…

Q: The speeds of all cars on the tollway was found to be normally distributed with a mean of 63 miles…

A: It is given that that µ=63 mile per hour. Obtain the standard deviation of the speeds of all cars:

Q: if an approxemitly  bell shaped distribution has a mean of 30 and standard deviation of 5, what…

A: Given that  X~N( μ = 30 , ? = 5 ) μ = 30 , ? = 5 Formula for Z-score Z-score =( x - μ )/?

Q: If the number of degrees of freedom for a chi-square distribution is 21, what is the population mean…

A: Given: Degree of freedom = 21

Q: If the variance of a distribution is 16, the standard deviation is?

A: Solution: From the given information, the variance of a distribution is 16.

Q: The standard deviation of the certain distribution is 9, what is its variance?

A: Hello! As you have posted 2 different questions, we are answering the first question. In case you…

Q: What is the variance of number of Sundays on a nonleap year?

A:

Q: What is formula for variance for sample?

A: Variance measures absolute variability in a data set, calculated with respect to the mean. That is,…

Q: the ____ is based on only two scores in a distribution. -deviations  -variance -range -standard…

A: We know that, Deviations refers to the distance between the observations from their corresponding…

Q: 1. If the standard deviation of a data set is 4. What is the variance?

A: As per our guidelines we are supposed to answer only one question per post so I am solving first…

Q: A petroleum engineer estimated the chances of drilling a dry well to be around 50% , and chances of…

A: The probability distribution of the amount of oil and the associated probability of drilling is as…

Q: A study found that 1% of Social Security recipients are too young to vote. If 800 Social Security…

A: Here, n=800 and p=0.01. The mean is 8, which is obtained below: μ=np=800×0.01=8

Q: The salaries of professional baseball players are heavily skewed right with a mean of $3.2 million…

A:

Q: Is it possible to obtain a negative value for the variance or standard deviation?

A: The variance and the standard deviation, which is the square root of the variance are the most…

Q: Does the distribution of sample variances tend to be a normal distribution

A: The shape of the sample distribution of sample variance will depend on the shape of the population…

Q: Suppose the birth weights of babies in a particular country are normally distributed with a mean of…

A: Answer:

Q: As the size of a sample increases, the standard deviation of the distribution of sample means…

A: Here  Standard deviation of sample mean = σn

Q: if the standard deviation of a sample is 0.5 find the variance

A:

Q: A statistician chooses 27 randomly selected dates, and when examining the occupancy records of a…

A: Givensample size(n)=27Variance(s2)=34.34conidence level=95%

Q: If a data set has 25 values and a standard deviation of 7.4, then the variance is?

A: Given: Standard deviation = 7.4

Q: The students of a large university in Luzon were studied regarding their hours of sleep at night.…

A: Given Information :  The students of a large university in Luzon were studied regarding their hours…

Q: If a sample of 144 male weights has a mean of 266 pounds and standard deviation of 32 pounds. The CV…

A: Given data Mean (x̅ ) = 266Standard deviation (s) = 32Coefficient of variation(CV) for sample is…

Q: Suppose that the variance of a hypothetical population is 49. What is the standard deviation?

A: Solution : Given : σ2 = 49 The variance of the population is denoted by σ2 and standard deviation is…

Q: The students of a large university in Luzon were studied regarding their hours of sleep at night.…

A: As the distribution of the hours of sleep can be modeled as normal distribution with mean μ of 6.9…

Q: The measurements of a distribution with a higher ______ will be more spread out.a. meanb. variancec.…

A: Mean:   The arithmetic mean (also called the mean) is the most commonly used measure of central…

Q: The value of the standard deviation will always exceed that of the variance. TRUE OR FALSE

A:

Q: Suppose the scores of students on an exam are normally distributed with a mean of 253 and a standard…

A: From the provided information, Mean (µ) = 253 Standard deviation (σ) = 80

Q: It has been found that with the standard dosage of a drug, the change in people’s uric acid levelis…

A: Given X is normal Distributed with mean µ = 240.0 and standard deviation σ = 60.0 now will using…

Q: If the probability that an object dropped from a certain height will strike the ground is 80 percent…

A: Solution- Given that , let p denote the probability that an object dropped from a certain height…

Q: If the variance of a national accounting examination is 900, how large a sample is needed to…

A:

Q: What does it mean that the variance (computed by dividing by N) is a biased statistic?

A:

Q: What us the variance of a distribution having a standard deviation of 5.26?

A: Given, standard deviation=5.26 find variance=?

Q: the ____ focuses only on the middle 50 percent of the cases in a distribution.  -interquartile…

A:

Q: The standard deviation of a sample of 100 observations equals 64. The variance of the variance…

A:

Q: Suppose that the distance of fly balls hit to the outfield (in baseball) is normally distributed…

A: let X be the distance of fly balls hit to the outfield X~N(mu=260,sigma^2=50^2) n=49 we want to find…

Q: Do researchers prefer to report the variance instead of the standard deviation because it is easier…

A: No, researchers prefer using standard deviation because standard deviation is in the same units as…

Q: What is the standard deviation of a sample of 120 observations, if the variance of the sample 2.56?

A: It is given that the variance of the sample is 2.56.

Q: In most cases, if you have the variance, how do you compute standard deviation?

A: We have the variance, how do you compute standard deviation.  We use here the formula of variance to…

Q: An analyst found that the average amount of money in bank accounts at his/her bank is $2,000 with a…

A:

Q: A researcher reports that the average income of system analysts in Makati is P44,000 per month. A…

A: Given: Average(μ)=44000sample size(n)=30Sample mean(x¯)=45800Standard deviaion(s)=5400

Q: If a data set has 16 values and a standard deviation 9.4, then the variance is

A: Given information: A data set consists of n = 16 values. The value of the standard deviation is, s =…

Q: If, in an analysis of variance, you find that MSTR is greater than MSE, why can you not immediately…

A: While performing Analysis of Variance (ANOVA), we calculate the test statistics which is the ratio…

Q: If the weight of fertilizer in a 40-pound bag is normally distributed with a standard deviation of…

A: Define  the Random Variable, X : Weight of fertilizer in the bag. X ~ N(40,0.52) Hence , the mean, µ…

Q: A traffic officer suspects that the mean number of car accidents every week is 4. A sample of 16…

A: Given,  n = 16 μ = 4x¯ = 7σ = 4α = 0.05

Q: IF THE VARIANCE OF A POPULATION IS 0.75, THE STANDARD DEVIATION MUST BE?

A: It is an important part of statistics . It is widely used .

Q: If the population standard deviation is 5.6, what is the population variance?

A: Given: Population standard deviationσ=5.6

Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.