43, Can we say that variance of distribution of weights of all students from which the above sample of 10 students was drawn, is equal to 20 square kg? Degrees of freedom

Q: In some population the interquartile range of the values of income (x) represents 41,9% of its…

A: Formula Used: Median = L+n2-CFf×h Quartile deviation Q = Q3-Q12 First quartile Q1 = L + n4-CFf×h…

Q: Prove the general formula for interval estimation of ratio of population variance.

A: Statement:-  If x1,x2..... xn ~ N(μx, σx2) and y1, y2 .....ym ~ N(μy , σy2) are independent random…

Q: The difference between two sample means follows a normal distribution if both populations follow a…

A: True We can find it by using the Central limit theorem. By the theorem, difference in sample means…

Q: Explain t- and F-Distributions and how does it affect the parameters and random variables of a…

A: Please find the explanation below. Thank you

Q: To obtain a maximum amount of variance, an item ought to have a degree of difficulty of what?

A: To obtain a maximum amount of variance an item ought to have a degree of difficulty is the number of…

Q: The burning life (in hours) of electric lamps installed in a street of a city follows a normal…

A: Given: μ = 120 hours = 60×120 minutes=7200minutes σ2 = 54000 minutes.   Formula Used: Z-score = X-μσ…

Q: If all the possible random samples of n=81 scores are selected from a normal population with u=80…

A:

Q: How many different simple random samples of size 4 can be obtained from a population whose size is…

A: The following information has been provided: The total number of elements are n=10. The sample size…

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A:

Q: If a uniform(0,8) distribution has a sample size of 10, how do you find the distribution of the…

A: The random variables Y1, Y2, ....Y10 follows uniform distribution interval [0,8]The PDF of Y is n=10…

Q: When a sample size from the population is n=1 than the standard error will always equal the

A: Given, Sample size from the population is n = 1

Q: The weight distribution of 100 NSU students is normally distribution with mean 70 kg and variance 2…

A: Given that mean is 70 kg and variance is 2 kg. That is,  μ=70σ2=2 i) Consider,…

Q: 3. What is the test variate used when the population variance is unknown and when the population…

A: There are two tests used for testing the population mean i.e. t-test and z-test. The t-test is used…

Q: If you have a Unif(0,8) distribution with a sample size of 10, how do you find the distribution of…

A: The objective of this question is to find the distribution of the largest order statistic, Y10, for…

Q: The average monthly income of public school teachers is Php25,000 with standard deviation of Php800.…

A:

Q: Derive variance for gamma distribution?

A:

Q: hich is unknown to us, so we use the sample variance to estimate the standard error for our…

A: As given, n1: The sample size of blood pressure of African zebras. = 5 n2:  The sample size of blood…

Q: A sample of final exam scores is normally distributed with a mean equal to 20 and a variance equal…

A:

Q: If a population has a variance of 12, what is the STANDARD DEVIATION of the sampling distribution of…

A: Variance=12  n=3

Q: What is the probability that the mean of a sample with 40 elements randomly selected from a normally…

A:

Q: A sample of N equals four has the variance of S squared equals 64 what is the estimated standard…

A: It is given that N = 4 and variance of S squared = 64.

Q: nt simple random samples are taken to test the difference between the means of two populations whose…

A: The t-test is used when the population standard deviation is not known, and the sample size is…

Q: When calculating an ANOVA, if the research hypothesis is in fact true, then. variance due to group…

A:

Q: The table below shows relative frequency distribution for 50 employees working in a small…

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Q: Left handed & right handed players on a baseball team Nominal Ordinal Interval Ratio

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Q: e length of human pregnancies from conception to birth varies according to a distribution that can…

A: given data, normal distributionμ=267σ=17

Q: A parametrical statistical test is one that makes assumptions about the parameters that define the…

A: here use basic definition of parametric statistical test  parametric test evaluate hypothesis test…

Q: True of False? The distribution of the sample mean, x , will be normally distributed if the sample…

A:

Q: If all 24 samples from a population produce the same age x = 20, what are the sample meanµ and the…

A: All 24 samples from a population produce the same age x=20. That is each xi=20 then

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A: From the provided information, Number of treatment (k) = 4 Number of participants in each treatment…

Q: The length of time for a college applicant to complete the college achievement test is normally…

A: Given: Mean = 70 minutes Variance = 144 min2 To find: The probability of selecting an applicant at…

Q: A population is normally distributed and has a mean of 50 and a standard deviation of 5 If we…

A: As we know the empirical rule of 68 - 95 - 99.7 that is the percent value that are one, two or three…

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A:

Q: Draw a scatter graph of this in i. ii. Determine the equation of the a linear relationship. ii. Draw…

A: Given data,   X Y X*Y X*X 50 20 1000 2500 100 65 6500 10000 150 75 11250 22500 200 130…

Q: Explain kurtosis of the distribution?

A:

Q: A population forms a normal distribution with a mean of 85 and a standard deviation of 24 compute…

A: The mean is 85 and the standard deviation is 24.