The following are sum of the particulars distribution of weights, of boys and girls in a class. Boys Girls 100 50 60 45 9 4 Find the S.D. of the combined data? Which of the two distributions is more variable. No. of persons Mean weights (Kgs) Variance of

Q: Suppose that the random variable X represents th If E(X) 9 and V(X) 0.25, wh millimeters. Meani…

A: Let X be a random variable that represents the length of a punched part in the centimeters.Let Y be…

Q: Which of the following is TRUE about the variance of the sampling distribution of sample means? It…

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Q: wishes to estimate the mean score achieved by all adults on the test. Find the sample size needed to…

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Q: distribution shown in the preceding histogram is    .   Based on the shape of the distribution,…

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Q: The director of research and development testing and new drugs she wants to know if there's evidence…

A: Test statistic:Denote μ as the claimed mean; μ = 384. In a random sample of n = 79, the sample mean…

Q: You are testing the claim that the mean GPA of night students is different from the mean GPA of day…

A: The question is based on hypo. testing of a difference between two popl. means. Given data : GPA…

Q: the answer is a but many students in my class are opting for c, which makes no sense to m

A: Total states = 50 The x-axis of the histogram shows the average property damage in millions.

Q: Suppose that the random variable X measures the number of hot dogs purchased in a food court in an…

A: CorX,Y=0.75VX=VY=36W=2X+3Y

Q: The annual earnings of 25 people with a high school diploma and 16 people with an associate’s degree…

A: We have given that  High School Diploma Associates degree X1 = $36,875 X2= $44,900 S1= $5475…

Q: Why do we take the square root of the variance to obtain the standard deviation? to make the…

A: We know that, Standard deviation: It is the positive square root of the arithmetic mean(A.M.)  of…

Q: Suppose the variance of X is 95. What is the variance of .09X?

A: The objective of this question is to find the variance of a variable that has been scaled by a…

Q: Suppose the variance of X is 33. What is the variance of .23X?

A: Given,Var(X)=33 we know that Var(ax)=a2Var(X)

Q: The average exam score is 63 with a variance of 33.  Your exam has a Z score of 0.96. What is your…

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Q: We want to compare two population variances and draw a sample from each population for this purpose.

A: The two population variances are to be compared and sample from each population are drawn for this…

Q: Which of the following sets of data would produce the largest value for Cohen’s d if the difference…

A: Given that, the difference between the samples is 5 points.

Q: An analysis of variance produces SSb=35,SSw=15 and a F ratio with the df=1,5.What is the F ratio?

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Q: Column n Mean Variance Physical Activity days/week Frequency Frequency 600 500 400 300- 200+ 100- 0.…

A: The histogram helps in understanding the distribution of the data.

Q: A manager believes that the variance of output on the second shift is greater than the variance on…

A: State the hypotheses.

Q: Suppose that X is a random variable with probability density function given by: fx (x) = { k(x³ +…

A: To find k k∫02(x3+x) =1kx44+x2202 =1k164+42 =1k=16

Q: 5. Two different box-filling machines are used on an assembly line. The critical measurement…

A: It is given that: For machine A:sample size, nA=49sample mean, x¯A=22.7For machine B:nA=49,…

Q: 10. The following dot plot shoes the test scores for 10 students on a unit exam. Which shape most…

A: Option c is correct.  A normal distribution comes with a perfectly symmetrical shape. This means…

Q: 3. Complete the first 3 columns of the table below. Values Deviations Square deviations X - X X…

A: X-bar = 5.9 s= Σ(Xi-Xbar)2/(n-1)