For the following Before/After data, calculate the t-obtained for a Related-Samples t-test. a. 2.53 b. 3.41 c. 4.22 d. 3.59   Before After 10 22 15 21 16 20 14 16 18 24

Q: What is the degrees of freedom? A. 57 B. 30 C. 58 D. 29

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A: It is given that Sample size n = 155 Number of babies weigh more than 7 pounds, X = 88 Level of…

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Q: A Type I error is the probability of failing to reject a false null hypothesis.

A: Ans : False

Q: Use a t-distribution to find a confidence interval for the difference in means μ = μ₁-₂ using the…

A: From the provided information, Sample size (n) = 8

Q: (a) P(x≤ a) = 0.42 a = (b) P(x a) = 0.32 a =

A: a) Suppose the random variable x defines the Uniform probability distribution from 0 to 5.

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A: It is given that  x̅d = 3.1 sd = 2.3 nd = 30

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A: For the given data Perform t test for one population mean

Q: 1) Determine the critical value(s) for a one-mean z-test. A two-tailed test with α = 0.03. 2)…

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Q: What kind of hypothesis test or analysis should you do?

A: Test is that whether there is a relationship between age and income.

Q: Prove that If P(A) > P(B), then P(A/B) > P(BIA)

A: The conditional probability is defined as P(A | B) = P(A and B)/P(B),  P(B | A) = P(A and B)/P(A)

Q: a) Find c. b) Find P(X ≤ 2Y). c) Find the marginal pdf for X and Y.

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Q: The body temperatures of a group of healthy adults have a bell-shaped distribution with a mean of…

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Q: The alternative hypothesis, denoted by Hl, represents the opposite of the null hypothesis and is…

A: Given that  Alternative hypothesis is denoted by H1.

Q: What is the type of relationship between x and y? A. No relationship B. direct relationship C.…

A: Given that    X Y X \cdot YX⋅Y X^2X2 Y^2Y2   1.3 1.6 2.08 1.69 2.56   -1.2 -2.1 2.52 1.44…

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A: In the given problem we need to test whether there is difference between the mean number of hours…

Q: Which confidence interval would lead you to Fail to Reject H0? Test value: 10 Confidence…

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Q: clinical trial of the drug, 16 of 265 treated subjects experienced headaches (based on data from the…

A: Givenx=16n=265significance level(α)=0.05

Q: c. In a large class, the average grade in an economics course was 80 with SD of 10 points and the…

A: c) It is given that the regression model uses grades in economics to predict grades in psychology.…

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A: Given Standard deviations=532 Margin of error=132 At 93% confidence level the z is 1.81

Q: A sample of 150 married women determined that 127 are happy in their marriage. A sample of 150…

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A: The question is about to find joint m.g.f Given : f ( x, y ) = e-( x + y )  , x > 0 , y > 0…

Q: 30 randomly selected students took the calculus final. If the sample mean was 93 and the standard…

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Q: mean is 72 and standard deviation is 8 what is  P( x ≤ 72)

A: Given,mean(μ)=72standard deviation(σ)=8

Q: The following table shows the approximate amount of trash produced in an industrialized country from…

A: Given: n = 3 Formula Used: The equation of regression line is: Y = a + bX b = n∑XY-∑X∑Yn∑X2-∑X2 a =…

Q: The monthly earnings of a group of business students are normally distributed with a standard…

A: Given that  Margin of error =E =125 Population standard deviation =478

Q: Of 266 employees selected randomly from one company, 13.53% of them commute by carpooling. Find the…

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Q: From a sample of 200 bread rolls from Ideal bakery, 95 of the were wheat. The manager  of the bakery…

A: Solution-: Given: n=200,x=95,P0=0.49 We want to find, (a) The 95% confidence interval for the…

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Q: An economics quiz contains nine multiple-choice questions. Let x represent the number of questions a…

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Q: For an exam with a mean of μ = 84 and a standard deviation of σ = 6, Mary has a score of X = 93,…

A: GivenMean(μ)=84standard deviation(σ)=6

Q: A statistical research yields to the sample proportion of a certain feature in a certain community…

A: It is given that  Proportion, p = 0.56 Margin of error, ME = 0.05 Confidence interval = 90%

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Q: Find a 90% confidence interval for the population mean price (per 100 pounds) that farmers in this…

A: Given that  Sample size n =45 Sample mean =6.88 Population standard deviation =2

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Q: The mean number of milligrams of sodium in a certain brand of dinner is 540mg with a standard…

A: Given Mean=540 Standard deviations=48 Sample size=64