A researcher would like to determine whether people can really tell the difference between the bottled water and tap water. Participants were asked to taste two unlabeled glasses of water, one bottled and one tap, and identify the one they think tastes better. Our of 40 people in the sample, 28 picked the bottled water. Was the bottled water selected significantly more often than would be expected by chance? Use a two-tailed test with α = .05

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Q: An airline is trying two new boarding procedures, Option 1 and Option 2, to load passengers onto…

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A: Given Information: Group 1: Sample size (n1) = 387 Out of which X = 126  experienced drowsiness as a…

Q: In randomized, double-blind clinical trials of a new vaccine, infants were randomly divided into two…

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Q: is there sufficient evidence to support the claim that the mean Option 1 loading time, μ1, is less…

A: Given : n1=205 , n2=270 , X1-bar=17.7 , X2-bar=18.3 ,  s1=5.1 , s2=4.1  , α=0.05 Here , we want to…

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A: n = 84 x1 = 59250x2 = 61000s = 9500

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A: There are two independent samples which are Option 1 loading time and Option 2 loading time. We have…

Q: An airline is trying two new boarding procedures, Option 1 and Option 2, to load passengers onto…

A: Solution: Given information: Option 1 sample statistic are n1= 265 x1 = 17.6 s1= 4.7Option 2 sample…

Q: A 1980 study investigated the relationship between the use of OCs and the development of endometrial…

A: O E (O-E)^2 (O-E)^2/E 6 3.199219 7.844376 2.451966 8 10.80078 7.844376 0.726279 111 113.8008…

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Q: In randomized, double-blind clinical trials of a new vaccine, rats were randomly divided into two…

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A: Given Information: Option 1: Sample size n1=225 Sample mean x¯1=17.4 Sample standard deviation…

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Q: In randomized, double-blind clinical trials of a new vaccine, monkeys were randomly divided into two…

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A: For the given data perform z test for two population mean

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A: Given p-value of the two-tailed test = 0.0134.

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Q: In randomized, double-blind clinical trials of a new vaccine, infants were randomly divided into two…

A: Solution: The null and alternative hypothesis is  Ho:p1=p2    Vs H1:p1>p2

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A:

Q: A researcher selects a sample from a population with a mean of 50 and administers a treatment to the…

A: The given sample mean is 49. After the treatment is administered, the scores are expected to…

Q: An airline is trying two new boarding procedures, Option 1 and Option 2, to load passengers onto…

A: Given: n1 = 235 X1 = 17.7 S1 = 5.1 n2 = 225 X2 = 18.3 S2 = 4.2 α = 0.05 Formula Used: Test-statistic…

Q: In randomized, double-blind clinical trials of a new vaccine, monkeys were randomly divided into two…

A: Two sample proportion z test: Two sample proportion z test is used to test the significance…

Q: In randomized, double-blind clinical trials of a new vaccine, monkeys were randomly divided into two…

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2-Proportion Test

In a 2-proportion test, two separate proportions are measured at the same time, and their similarity is evaluated. It is also known as a 2-proportion z-test, and a comparison of two different proportions is done in this method.