Due to the Covid-19 epidemic. Many shops went online. One of them is an online restaurant. It claims that the mean delivery time for food orders is less than 120 minutes with a standard deviation of 30 minutes. Is there enough evidence to support this claim at a 0.05 significance level if 49 orders were examined with a mean of 100 minutes? Conduct a hypothesis test by going through the six steps

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A: From the provided information, nx=39sx=23.36ny=39sy=26.64 Level of significance (α) = 0.10

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A: Zcritical=Zα/2=1.6449 H0:μ=12 vs H1:μ≠ 12  n=38, x¯=11.4  and σ=2.2 Z=(X¯-μ)σ/n

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A: Mean(µ) = 12Standard deviations (σ) = 0.25X ~ N (µ, σ )= N (12,0.25)

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A: From the provided information, Mean (µ) = 38.12 minutes Standard deviation (σ) = 8.63 minutes X~N…

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A: Here, M1=27, sd1=6.9 and M2=24, sd2=6.2 n1=n2=90=n Pooled sd, sp=sqrt((6.92*89+6.22*89)/(90+90-2))…

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A: As per our guidelines, we are allowed to answer first three sub-parts only. Thanks   Given : One…

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A:

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A:

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A:

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A:

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A: Given that  Sample size n =25 Sample mean =371 Population standard deviation =45

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A: Given that,

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A: Mean=12 Standard deviations=5 Sample size=9

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A: Hypotheses: Null hypothesis: µ ≥ 850. That is, the mean cotton yield per acre is not less than 850…

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A: Given data,Mean μ=8.42sd    σ=1.52P(6.9<X<9.94)=?

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A: We habe to find p value.

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A: Given,sample size(n)=10sample mean(x¯)=7.07population standard…

Q: According to a research study, American teenagers watched 14.8 hours of television per week last…

A: a.Let µ be the true mean amount of time per week each teenager watched television.Let x bar be the…

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A:

Q: According to a recent study published by the American Statistics for Educators Journal, statistics…

A:

Q: A shareholders' group is lodging a protest against your company. The shareholders group claimed that…

A: Solution: State the hypotheses. Null hypothesis: H0: µ≥10 That is, the population mean tenure for…

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A: Sample size n =43 Sample mean=23.6 Standard deviation =5.1

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A:

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A: Given that, The mean and standard deviation of the sampling distribution of sample mean is,

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A: Given information: Given that X1, X2, … , Xn be a random sample from the population N(µx, σ2) and…