What is the formula for Richardson extrapolation?

Q: If I am to conduct research which involves a population of 2000 people, how many people would I need…

A: If the population size is more than 1,000 and less than 10,000 then selecting a sample size of…

Q: In performing linear spline interpolation, the se- quence of the abscissa values of the data points…

A: In performing linear spline interpolation, the sequence of x-coordinate should be equally spaced.…

Q: Assume that in your liguistics class you have earned the test scores 83, 74, 54, and 64; and only…

A: Given test scores 83, 74, 54, and 64 Let the score of remaining test be x   Given that mean should…

Q: The u for adults on a memory test is 120. We test a sample of children to see if they are different…

A: Null and alternative hypotheses: The hypothesis which is tentatively fixed up under and tested for…

Q: Write what is Cohen’s Guidelines for d?

A: The formula for Cohen's d value is obtained below:

Q: In the Kruskal–Wallis test, how should you deal with tied ranks?

A: Assumptions of Kruskal – Wallis test:   The conditions for performing the Kruskal-Wallis test to…

Q: What is the devivative of |x|?

A: Our objective is to find the derivative of |x|.

Q: when is a dummy variably useful?

A: Dummy variable: This is an artificial variable which indicates more than or equal to two categories…

Q: A CBS News poll asked a random sample of 1025 Americans how they identified themselve politically…

A: Given: α=0.05

Q: Fultivated grassplot Deciduous fc 16 61 for testing if barking deer prefer to forage in c are…

A: a) The null and alternative hypothesis Ho: All habitats are equally preferred  HA: Some habitats…

Q: A researcher rejected the null where r(146) = .148, p = .03 and concluded that the effect size was

A: Reviewing information, Given that, r=0.148p=0.03

Q: s, the following 2 → 2 tables were ol arance of gallstones) versus no resp Negativ Positive

A: negative positive total plasibo  a c a+c ursodiol b d b+d total a+b c+d a+b+c+d…

Q: A researcher rejected the null where r(146) = .148, p = .03 and concluded that the effect size was…

A: Conditions: If the value of r lie between 0.1 to 0.3 then the effect size is small. If the value of…

Q: Below is a table that a sample of 100 people from a school and what type of car they drive and if…

A: From the given information,   Foreign Domestic Total Student 15 35 50 Staff 25 25 50 Total…

Q: To decide whether two variables of a population are associated, we usually need to resort to…

A:

Q: If a Test of Independence were run, what is the number of degrees of freedom this test would…

A: The number of degrees of freedom this test = (r-1)*(c-1) = 2*2  = 4

Q: How can you make sure your factorial design is well designed?

A: Factorial designed is used to determine the effects of multiple levels on a response.

Q: A statistician computed the Z-scores of all the observations in a sample and after he added all of…

A: The Z-score for the ithobservations in a sample is given by :  Zi=xi-μσ The sum of the Z-scores for…

Q: A multinational firm hired a consultant to determine if the workers in their domestic plants were…

A: Given Information : A multinational firm hired a consultant to determine if the workers in their…

Q: Mr. Gotcha administers a "lie detection" test to a population of job applicants. He correctly states…

A: No. Of (actual lair, test lair) = 160 No. Of (actual truth teller, test lair) = 800-640= 160 Total…

Q: The NFL wants to see if the coin that is used for Super Bowl is fair. They put the coin in a…

A: Given Data: p=223/500=0.446 n=500   Null and Alternate hypothesis: H0: p=0.5 HA: p not equal to 0.5

Q: aul received a score of 70 on a history test for which the class meam ass? biology test O history…

A: Concept: A z-score is known as the standard score that determines how much the data point deviates…

Q: if the p value from the output of SPSS is .02. then____________.

A: From the given information, Consider, the p-value from the SPSS output is 0.02. Assuming…

Q: There shouldn't be a blood group difference between men and women as blood group type is not…

A: There are two categorical variables which are Sex and Blood type. Sex has 2 types which are male and…

Q: The closer the numerator of a t-test gets to zero, the more likely it is that there is no…

A: Explanation: IF the value of numerator of t test statistic is closer to zero, then the test…

Q: What are the three reasons for using OLS?

A: Least squares method: The constants in the regression line are obtained by minimizing the sum of…

Q: The Range of recorded covid-19 cases during 4 week in Oman is

A: Range is the difference between lowest and highest values .  It's formula is given as : Range = max…

Q: show that 0 is an unbiased

A:

Q: A researcher rejected the null where r(98) = .770, p < .001 and concluded that the effect size was…

A: Conditions: If the value of r lie between 0.1 to 0.3 then the effect size is small. If the value of…

Q: Is the fo llowing mtegral conuergent or divergent ?

A:

Q: what is ncx?

A: Combination: The number of different selections of ‘x’ elements (order doesn’t matter) from a set of…

Q: If the test result is significant at 5% level, it must also be significant at 1% level. True O False

A: Given : Significance level , α = 0.05

Q: When testing whether or not B1 = 0, why is the F test a one-sided test even though Ha includes both…

A: The F distribution lies from 0 to infinity. The left tail values of the F distribution are less than…

Q: A recent study claims that 40% of registered voters associate themselves with Democrats. 35% with…

A:

Q: Calculateaconfidenceinterval for the me-dian ofthe second population.Select your confidenc eleve…

A:

Q: In a study done in Michigan, it was determined 38 (out of 62) poor children who attended preschool…

A:

Q: Where does the Tukey’s HSD test can be used?

A:

Q: dents in the sections of principles in statistics are consid

A: A discrete random variable is a variable that takes only a finite number of distinct values. A…

Q: Researchers conducted a study to estimate the relationship between a subject's brain activity while…

A: Solution:  To test the claim that long commercials recall is more than short one,  Null hypothesis:…

Q: What is the full form of SPSS and SAS?

A:

Q: What is the purpose of testing whether ᵝ1=0? If we reject ᵝ1=0, does it imply a good fit?

A:

Q: What is the missing value for the degrees of freedom for the "within" row (marked by a ?)?

A: It is given that Number of groups k = 4 Number of observations n = 31

Q: When does Counterbalancing will be inappropriate?

A: Counterbalancing may not completely dissipate the order effects in every case. In some cases it…

Q: If the test result is significant at 5% level, it must also be significant at 1% level.

A:

Q: What is t critical for a study that contains 9 participants in one group and 11 is another group?…

A: Solution-: Given: We want to find critical values for situation

Q: Explain the overidentifying restrictions test? how this can be computed?

A: The over identifying restrictions test or the J-test is basically an approach to test whether the…

Q: We collected data for 300 people at a movie theater. For every person, we know what genre of movie…

A: There are two categorical variables which are type of movie and whether or not they bought snacks.…

Q: Show that the bias of 0 for estimating 0 is Bias(0) 1 n+1 -0.

A: Result Bias(θ)=E(θ^)-θ≠0