To compare the battery life of Duracell versus Energizer batteries, sample of 140 Duracell batteries lasted an average of 345 minutes with a standard deviation of 95 minutes and a sample of 125 Energizer batteries lasted an average of 280 minutes with Asana deviation of 86 minutes. a) at the 1% level of significance, test the hypothesis that Duracell batteries last at least 45 minutes longer on average then energizer batteries

Q: A researcher randomly sampled 53 hens of a certain species andcounted the number of eggs laid during…

A:

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A: Solution: Let X be the weight of the manufactured computer parts. From the given information, x-bar…

Q: A study was performed to determine whether men and women differ in repeatability in assembling…

A: Given: n1=28n2=25s1=1.98s2=2.31α=0.02

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A: From the provided information,

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A: “Since you have posted a question with multiple sub-parts, we will solve the first three sub-parts…

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A: Given that  The mean lung capacity for nonsmoking males in the population aged 50 is 2.2 liters =…

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Q: How large a sample is required to estimate the mean speed of all cars travelling on the high way…

A:

Q: A researcher is interested in the average diameter of apples. The researcher took a random sample of…

A: Hey there! Thank you for posting the question. Since there are multiple questions posted, we will…

Q: A comparison is made between two bus lines to determine if arrival times of their regular buses from…

A: A comparison is made between two bus lines to determine if the arrival times of their regular buses…

Q: The State of Pennsylvania has changed one of its toll roads from manual collection of tolls to…

A: Here , Two tailed Z test is used.

Q: A sample of 62 city blocks were taken in Black majority neighborhoods and 58 city blocks in…

A: From the provided information, Sample size (nB) = 62 And nNB = 58 Level of significance (α) = 0.10

Q: A company claims that, the mean battery life of their cell phone is at least 5 hours and standard…

A: Given,sample size(n)=25sample mean(x¯)=4.8standard deviation(σ)=0.5α=0.04H0:μ<5H1:μ≥5

Q: a randomized, double-blind experiment, 90 babies were randomly divided into a treatment group (n, =…

A: We have to perform F test for comparing two standard deviations.

Q: A sample of 62 city blocks were taken in Black majority neighborhoods and 58 city blocks in…

A: Suppose the observations corresponding to black majority is the 1st sample and the observations…

Q: A sample of 62 city blocks were taken in Black majority neighborhoods and 58 city blocks in…

A: From the provided information, nB=62xB=11.0362sB=4.3976nNB=58xNB=10.4195sNB=4.9371α=0.10

Q: f7.22. on time

A: Solution

Q: A sample of 62 city blocks were taken in Black majority neighborhoods and 58 city blocks in…

A: Null and alternative hypotheses: Null hypothesis is a nullified statement about population parameter…

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A: The SD for waiting times of customers is 3.97 minutes;σ=3.97 A random sample of 14 customers with…

Q: O 57% Listed in the data table are amounts of strontium-90 (in millibecquerels, or mBq, per gram of…

A:

Q: Priya is investigating the population density of deer in several different forests. The mean…

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Q: The sample mean weight of 65 adult African elephants was measured to be 14,325.62 pounds, with a…

A: Solution : Given :  n= 65, X¯ = 14325.62 pounds, σ = 872.71 pounds , α = 0.10 Let us define , H0 : μ…

Q: The finish times for women in the 25-29 age group of the Hermosa Beach Triathlon in California are…

A: a).Given, For women, μw=5261σw=807 For men, μm=4313σm=583 Using empirical rule, the required middle…

Q: The sample mean weight of 200 adult vulturine parrots was measured to be 734.2 grams, with a…

A: Given  x bar = 734.2s = 15.7n = 20 The 90% CI is given by

Q: 8. 140 migrating pigeons were caught by a biologist for data collection. The mass of these pigeons…

A: n=sample size=140, mean μ=0.9, standard deviations σ=0.15  Note: This probability value calculated…