The following table gives the mean and S.D. for two groups X and Y. Find the Combined S.D. of these groups. Groups Size Mean S.D. 40 80 9.0 Y 50 70 10.0

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A: Solution

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A: Given: Sample size, n = 50Mean, μ = 11.5 Std. Dev, σ = 4.0  

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A: Formula : Standard error :  σₓ̄ = σ/√n

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A: From the given information, the regression model is, Class averagei=β0+β1*Office Hoursi+ui Here, the...

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A: Here use tree diagram and Bayes rule

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A: Select the correct choices that could not represents the probability an event

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Q: Compute for the mean, median, mode and sd. Round off your answers to the nearest hundredths

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A: The sample size n is 60.

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Q: Construct a box plot for the given data.  Include values of the 5-number summary in all box plots. ...

A: Given data is,32 , 37, 41, 44, 46, 48, 53, 5557, 57, 59, 63, 65, 66, 68, 6970, 71, 74, 74, 75, 77, 7...

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A: Here We have  Mutually Exclusive Events: The Events which do not occur at same time. i.e they do not...

Q: 1. Let x, x2 and x3 be the excess of heights of father, mother and son respectively in 100 samples a...

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Q: Example 3.17 Let X be a discrete random variable with range Rx = {0, 5,5, , 7}, such that Px(0) = Px...

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Q: In a random sample of 200 households that recently visited Intercity Shopping Centre, it is found th...

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Q: Discuss the concept of the "Law of Large Numbers" and its role in the discipline of probability.

A: We have to discuss the concept of the " Law of Large Numbers" and its role in the discipline of prob...

Q: income in the past 10 days then find his expected income. *

A: here expected value = ∑xp(x) here x= income p(x) = probability of income x p(x) =no. of time income ...

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Q: what is the probability that at least one will be working when I return?

A: Here given, The length of life of a certain brand of light bulb is normally distributed with a mean ...

Q: Isabel Briggs Myers was a pioneer in the study of personality types. The personality types are broad...

A: Given that  Number of Similar Preferences Number of Married Couples All fourThreeTwoOneNone 331...

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Q: the past 10 days. Construct the probability distribution of the driver's income in the past 10 days ...

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Q: It is thought that 63.7% of the student body owns a school sweatshirt. A student reports that from a...

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Q: Q-5 The coefficient of variation of a symmetrical distribution is 9% and mean of the distribution is...

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Q: At the end of a product's lifetime, the time until failure is modeled using an exponential distribut...

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Q: a) The following data shows how many employees showed up to work every day for two weeks 12 18 09 16...

A: Given data is 12,18,09,16,11,10,08,10,13,11,15,17,16,11

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Q: An article in The Engineer ("Redesign for Suspect Wiring." June 1990) reported the results of an inv...

A: Givensample size(n)=1600x=16p^=xn=161600=0.01

Q: The annual sales of a company are given below. Estimate the sales for 1995 year 1985 1990 1995 2000 ...

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Q: 7. Let X be a continuous random variable with probability density function given by Se-(z-z0) x > x0...

A: Let X be the continuous random variable with probability density function is,  f(x) = { e^-(x-x0)   ...

Q: A physics class has 40 students. Of these, 16 students are physics majors and 14 students are female...

A: Given that  Total students=40 Physic majors=16 Female=14 Female and Physic majors=4