There is a new intervention method proposed to reduce the Covid infections during the pandemic. Assume we want to calculate the sample size to reduce the infection rate by 10% by comparing to the control group? How large the sample size is needed to detect a 10% difference with a type I error rate of 0.05 (two sided) with a power of 80%? Assume a 20% dropout rate is conside

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A: Given that - A population of N= 23 scores has a mean of u = 5. After one score is removed, the mean ...

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A: Let Z follows Std. Normal distribution i.e N(0, 1) And t follows t distribution. 

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A: Farmula used  E(X)=∑xP(X=x) 

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A: Given that, b1= 6.715,  b0= 16.706 Regression equation=?

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Q: The monthly income from a particular occupation is normally distributed, with a mean of 3800 dollars...

A: X~N(mean=μ=3800, σ=standard deviation=250)   

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Q: Define Karl Pearson's coefficient of correlation and discuss the methods of studying it?

A: Karl Pearson's coefficient of correlation : A linear correlation coefficient in the range of -1 to +...

Q: You are working part-time at a road construction firm. Your boss knows you are learning some statist...

A: Solution: n= 51 Sample size  ∑x=7438.46x=∑xn=7438.4651=145.8522  Sample mean σ=2.75 Population stand...

Q: Critical values for quick reference during this activity. Confidence level Critical value 0.90 z* = ...

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Q: asing the sample size will increase the precision of estimation of the confidence interval on the po...

A: Confidence Interval :                              Let x1,x2,x3,....xn be a random sample from the p...

Q: 16. Fit a binomial distribution to the following data : 4 3 1 х : 10 4 62 46 28 f :

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A: Given Information:       Margin of error E= 0.10Standard deviation σ=20.5Significance Level α=0.05  

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A: Given Age QIV group Control group 3 - 4 3.79 5.66 5 - 8 1.75 5.16

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Q: A sample of n = 36 scores is obtained from a population with u = 100 and o = 24. If the sample mean ...

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Q: It is known that 60% of customers will need additional maintenance on their vehicle when coming in f...

A: We have given that  Sample size n =50 Sample proportion p^=60%=0.60

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A: Formula : For independent event,  P(A|B) = P(A)