If a treatment is expected to increase scores among a population with u= 20, then the alternative hypothesis is µwith treatment > 20.

Q: At 0.05 level of significance, test the hypothesis that the new procedure is much better than the…

A: Given : x1= 75 n1= 1500 x2= 80 n2= 2000 significance level, 0.05

Q: If I have a sample of 25 people what is my T-threshold for a two-tail test and an alpha of 0.05…

A: Given: Sample size (n)=25 Level of significance α=0.05%

Q: What is the critical value for a one sided t-test with an alpha = .1, and degrees of freedom = 12?

A: Solution: From the given information, α=0.1 and degrees of freedom is 12. The critical value can be…

Q: Compute the x² value (test statistic) for this scenario.

A: here from given table complete the table with row total and column total    for Against Row…

Q: A competitive sports league expects athletes to practice 1000 hours a year, but they predict that…

A:

Q: A study reported the results of a randomized trial of whole-body hypothermia (cooling) for neonatal…

A: Givenx1=29n1=99Hypothermia treatment group:-p1^=x1n1=2999=0.2929Control…

Q: The probability of the data under the model of the alternative hypothesis (model 1) is 0.0008 and…

A:

Q: An estimator for parameter v is consistent if E(v) is close to v when sample size is increased.…

A: Given If E(v) is close to parameter v, the estimator is consistent.

Q: If you are making 4 comparisons between means, then based on the Bonferroni correction, you should…

A: Introduction: While performing an analysis, a researcher may often need to make multiple comparisons…

Q: What would you conclude based on an α=0.05 ​level?   We reject   the null hypothesis and do not…

A: From the previous information, it is known that the p-value is  0.9857. And level of significance is…

Q: If the probability of a defective bolt is 1/10, find (i) the mean; (ii) variance; (iii) moment…

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Q: Why would you use a low alpha? To minimize the probability to make a Type I error To minimize the…

A:

Q: If I am conducting a one-tailed z test and my risk is 1% what should my critical value be?

A: From the provided information, The level of significance (α) = 1% that is 0.01 The test is one…

Q: It is believed that a sweetener called xylitol helps prevent ear infections. In a randomized…

A:

Q: If the p-value is greater than alpha, we will. reject the null hypothesis and accept the alternative…

A: If the P-value is greater than alpha, we do not have sufficient evidence to reject the null…

Q: A hospital reported that the nomal death rate for patients with etensive burns (more than 40% of…

A:

Q: A sample of size n = 20 is drawn from a normal population. Find the critical value tα/2 needed to…

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Q: Imagine that your null hypothesis is μ = 16 and your alternative hypothesis is μ ≠ 16 for a…

A: It is given that the test is two-tailed. Level of significance is 0.05 Degrees of freedom is 19–1…

Q: For a hypothesis test with alpha level held constant, as sample size increases the critical values…

A: For a hypothesis test with alpha level held constant, as sample size increases.

Q: If the T test value (T calculate) for the difference between the means of two large samples is 2.57…

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Q: When the P - value is equal to the alpha level, the null hypothesis should be accepted.

A: P-value is the probability value which is derived from test statistic and it is useful to decide…

Q: . Is there sufficient evidence at the 0.05 level of significance that the average years of…

A: To test whether there is sufficient evidence at 0.05 level of significance that the average years of…

Q: Is this a valid experimental design?

A: Here student want to check fertilizer affect the plant growth

Q: If the omitted variable is negatively correlated with the treatment (x1,x2)0), then the effect of b1…

A: Introduction: Consider a multiple regression model with response variable, y, and two explanatory…

Q: A random sample of size n = 9 will be taken from Y~N(H, o = 24) where u is unknown. The following…

A: Here it is given that, the present distribution is N(μ, σ=24) where μ is unknown.  Now, the testing…

Q: In a hypothesis test, assuming the conventional critical value for evaluating p-values of 0.05, a…

A: We have given that  P-value  greater than level of significance ( alpha ) = 0.05 Alpha = level of…

Q: If the random sample of X1,…, Xn comes from the uniform (0, Ɵ) distribution, which of the following…

A: Given information: Given that the independent random variables X1, X2, … , Xn are uniformly…

Q: If conducting a two-sided test at level of significance 0.05 based on a sample of size 20, the…

A: If the test is two sided then there will be two critical values.

Q: It is easier to reject the null hypothesis if the researcher uses a smaller alpha (α) level. choose…

A: We know that, Type I error is – In this we reject the null hypothesis which is actually true called…

Q: What is the critical value for a two sided t-test with an alpha = .05, and degrees of freedom = 60?

A:

Q: Your null hypothesis is μ = 12 and your alternative hypothesis is μ ≠ 12 for a population with…

A: It is given that the mean is 12, n is 15 and the level of significance is 0.01.

Q: Imagine that your null hypothesis is σ2 = 10 and your alternative hypothesis is σ2 > 10. What is…

A: It is given that the test is right-tailed. Level of significance is 0.05. Degrees of freedom is 12–1…

Q: What is the critical value for a two sided t-test with an alpha = .02, and degrees of freedom = 29?

A: Given, alpha = .02 degrees of freedom = 29 and mentioned that 2 sided t-test, Therefore from t-table…

Q: The recidivism rate for convicted sex offenders is 9%.  A warden suspects that this percent is…

A:

Q: Which assumption of the least-squares estimation is violated when the error term is heteroscedastic?…

A: In regression analysis, heteroscedasticity means unequal scattering. It refers to a situation where…

Q: A limousine company is concerned with increasing costs of maintaining their fleet of 150 cars.…

A: Let p be the population proportion. The population proportion is 0.36, and sample size is 20.…

Q: The local swim team is considering offering a new semi-private class aimed at entry-level swimmers,…

A: Introduction: According to the given information, the assumed mean from the previous year’s data for…

Q: A company with a fleet of 160 cars found that the emissions systems of 9 out of the 25 they tested…

A: Given: Sample size, n is 25 The number of cars that fail to meet guidelines (x) is, 9 The proportion…

Q: When is a post-hoc test used? (Select all that apply.) a. when you decide to do a within-subjects…

A: Post-hoc test :

Q: Can I use  CRONBACH’S ALPHA in testing the reliability of the device? How?

A: CRONBACH's Alpha:  It is a measure of internal consistency. Cronbach alpha can be considered as a…

Q: (b) Suppose the concrete will be used for a particular application unless there is strong evidence…

A: Given : , μ0=100 , Assume that α=0.05 Our aim is to find the part (a) and p-value. Here , we use…

Q: Suppose we want to compare the IQ test scores of high school students from two different states. In…

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Q: Find the best critical region for testing H:1 = 2 against 0. H: 1 1 = 3 based on the sample drawn…

A: ANSWER: From  the given data,

Q: Suppose an experiment finds that people taking a new herbal remedy get fewer colds than people…

A: Given an experiment that people taking a new herbal remedy get fewer colds than people taking a…

Q: The

A: Design of experiment

Q: Imagine you predict that it will take a salesclerk at a mall longer to help out a potential customer…

A: We would not want to say that we proved our hypothesis correct. Other reasons that might there be to…

Q: A type 2 error occurs when a treatment actually does have an effect on the scores but the effect was…

A: True. we know that, type 2 error occurs when we fail to reject Null hypothesis when it is actually…