In a survey, 28 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $50 and standard deviation of $3. Find the margin of error at a 99% confidence level. Give your answer to two decimal places. Submit Question

Q: You wish to test the following claim (HaHa) at a significance level of α=0.05α=0.05.…

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Q: or a standard normal distribution, find: P(z > -2.55) Round to 3 decimal plac

A: P(Z > -2.55)  = P(-2.55 < Z <0) + P(Z > 0) = 0.5 + P(0 < Z < 2.55)   (Since,…

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A: Given data is  f(x,y) y 1 2 3 Total x 1 0.10 0.05 0.02 0.17 2 0.10 0.35 0.05 0.50 3 0.03…

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Q: N 1 1 1 0.000 0.000 0.000 6 16 0

A: 95% CI   Variable reference B SE Wald df sig OR lower upper Healthily_M…

Q: Suppose you have an SRS of 23 observations and you compute: x = 42, s = 2.10 What is the margin of…

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Q: 1. Let X denote the number of times a certain numerical control machine will malfunction: 1, 2, or 3…

A: Given that: The joint probability distribution is given as, fx,y y 1 2 3 x 1 0.10 0.05 0.02…

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A: GivenMean(x)=115standard deviation(σ)=9.8sample size(n)=37significance level(α)=1-0.95=0.05

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A: From the provided information, Mean (µ) = 4.2 Standard deviation (σ) = 0.9 X~N (4.2, 0.9) Here X be…

Q: students and obtained the following data: 7.9, 5.5, 7.6, 6.2, 6.5, 7.8, 7.2, 7.5, 6.5, 8.5, 6.9,…

A: The given data is 7.9 5.5 7.6 6.2 6.5 7.8 7.2 7.5 6.5 8.5 6.7 7.5 9.4 7.6 6.2 5.6 8 8.1 5.9 7.3…

Q: baseball player’s batting average is 0.320 (32%). This player batted 100 times. 4. Evaluate np and…

A: Given that ; Sample size (n) = 100 Proportion (p) = 0.320 By using binomial approximation we solve…

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Q: (a) For the questions below, please show the derivation of the distributions step by step. Suppose…

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Q: The amount of pollutants that are found in waterways near large cities is normally distributed with…

A: Note: As per my policy i can answer only three sub parts. kindly repost the remaining sub parts…

Q: Let X denote the number of times a certain numerical control machine will malfunction: 1, 2, or 3…

A: Given f(x,y) y 1 2 3 Total x 1 0.10 0.05 0.02 0.17 2 0.10 0.35 0.05 0.50 3 0.03 0.10 0.20…

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A: Given: Mean(μ)=6.2standard deviation(σ)=0.9

Q: t. Find the conditional distribution of f(ylx), P(Y = 3 | X = 1). u. Find the conditional…

A: here given ,  joint distribution of X and Y  X=  number of times a certain numerical control machine…

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A: The test hypotheses are: Null hypothesis: H0: μ = 69.5 years Alternative hypothesis: H1: μ > 69.5…

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A: Given: sample size(n)=10   Age(x) Hours of sleep(y) xy x^2 y^2   8 8 64 64 64   15 8 120 225…

Q: where are they getting 0.36

A: The given percentile is 64th percentile.

Q: Σ(Υ – c)2 X₁= 12 Y₁ = 4 c = 2 X₂= 8 Y₂ = 9 X₁= 4 Y₁ = 6 X= 12 Y₁ = 3 X₁-11 Y₁ - 2 Your Answer:

A: Given: X1 = 12 Y1 = 4 c = 2 X2 = 8 Y2 = 9   X3 = 4 Y3 = 6   X4 = 12 Y4 = 3   X5 = 11 Y5 =…

Q: According to your conclusion above what type of error can occur?

A: Type I error (α): The probability of rejecting the null hypothesis when it is actually true. Type II…

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A: Given,n=122p=0.25A random variable X~Binomial(n=122 , p=0.25)

Q: Claim: >80; x = 0.01 Sample statistics: x=81.1, s= 3.1, n = 25

A: The claim is μ>80;α=0.01x=81.1s=3.1n=25

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Q: A population has a mean μ=90 and a standard deviation σ=25. Find the mean and standard deviation of…

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Q: Find the mean, variance, and standard deviation of the binomial distribution with the given values…

A: Given n=122 P=0.25

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Q: Question: What is the equation of the linear regression?

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A: Given,sample size(n)=20sample mean(x¯)=17.5  milesstandard deviation(s)=3.8  milesdegrees of…

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A: Theoretical Introduction The claim is typically referred to as a hypothesis, and the process of…

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Q: gineers must consider the breadths of male heads when designing helmets. The company researchers…

A: Given data,,Mean μ=5.8sd σ=1Due to financial constraints, the helmets will be designed to fit all…

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A: Given that.   X~N( μ , ?^2 )   μ=114    , ?=16   Z-score =( x - μ )/?   NOTE:- According to bartleby…

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A: The sample proportion is 0.4705.

Q: In a study of a group of women science majors who remained in their profession and a group who left…

A: Given that   x1 = 3.09 x2 = 2.92 σ1 = 0.78σ2 = 0.78 n1 = 107n2 = 222

Q: are given the sample mean and the population standard deviation. Use this information t O construct…

A: Given that  Sample size n =42 Sample mean =119.57 Population Standard deviation= 10.49

Q: An airline company is interested in improving customer satisfaction rate from the 55% currently…

A: Given data p=55% n=280 x=168