Given that the researcher wants to be sure the mean difference in the change in hemoglobin levels has a margin of error no more than 0.2 g/dL and the difference in the stand deviation between the mean hemoglobin levels for the two forms of iron supplements used to treat anemia is 1.2 g/dL, what is the desired number of recruits for the study, assuming the individuals will participate in a crossover trial, if the study’s attrition rate is expected to be .25? Group of answer choices n = 139 n = 554 n = 185 n = 55,320

Q: You are comparing freshmen and seniors at your college on hours spent studying per day. You pick a…

A: First sample (male): x1-bar = 3, (s1)2 = 1.2, n1 = 11. Second sample (female): x2-bar = 2, (s2)2 =…

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A: Given The data is as follows: With moderator Sample standard deviation, s1=24.4 Sample size, n1=4…

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A: Given The data is as follows:   Male financial analysts Female financial analysts  Sample size…

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A:

Q: A researcher is interested in knowing whether male heroin addicts' assessments of self-worth differ…

A: To determine if the mean score of self-worth among male heroin addicts significantly differs from…

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A: From the given Information,The Data values are,1.53, 1.06, 0.93, 1.38, 1.47, 1.2, 1.16.

Q: b. The test statistic 2.234 (please show your answer to 3 decimal places.)

A: State the hypotheses.   (b)   Obtain the value of the test statistic . The value of the test…

Q: Sony would like to test the hypothesis that the average age of a PlayStation user is different from…

A: Step 1: State the given data: sample mean 1, x̄1 = 33.7population standard deviation 1, σ1 =…

Q: 7. In a study with 30 student participants, r = -.60 for the correlation between time spent studying…

A:

Q: Should post-hoc tests

A: 1a) A post hoc test is then used only if H0 (the null hypothesis) is rejected to determine which…

Q: Response to allergen inhalation in allergic primates. In a study of 12 monkeys, the standard error…

A: From the provided information, Sample size (n) = 12 Standard error (SE) = 0.4

Q: A random sample of 10 from population 1 had a variance of 3.600, while a sample of 15 from…

A: The provided information is:

Q: The U.S. Center for Disease Control reports that in year 1900, the mean life expectancy is 48 years…

A: Solution: Given information: n1= 29000  Sample size of white population n2= 96000  Sample size of…

Q: wI UL 100 pts poSS A researcher intends to estimate the effect of a drug on the scores of human…

A: Confidence interval for Difference of two mean is given by, Given that, n1= 9, x1 bar = 9.16,…

Q: If one explanatory Variable is correlated with the error term, is there any problem of…

A: Heteroscedasticity means unequal scatter. In regression analysis , we talk about heteroscedasticity…

Q: 32 students from Batangas National High school shows a mean 1Q of 111 while 30 students from…

A: We want to test the hypothesis

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A: Given: Population mean μ = 8.25 Sample mean X = 7.88 Sample standard deviation S = 1.25

Q: A union of restaurant and foodservice workers would like to estimate the mean hourly wage, µ, of…

A: Solution

Q: Consider a dataset containing the heights of 38 females who said they prefer to sit in the front of…

A: Type I Error: α=Preject H0|H0 is truth Type II Error: β=Preject Ha|Ha is true   1-α=PFaild to reject…

Q: When calculating an ANOVA, if the research hypothesis is in fact true, then. variance due to group…

A:

Q: In a drug trial, Merck was interested in deciding whether, in the range 40 to 80 mg, the dosage of a…

A: The mean of sample means is X¯¯=X¯1+X¯2+...+X¯nn   =∑iX¯inwhere X¯i=ith sample mean…

Q: A psychologist examined the effect of chronic alcohol abuse on memory. In this study, a standardized…

A: Given: µ=50 σ=6 n=22  X=47 α=0.05

Q: population sta ke use of the C periment might

A: Sample sizes are: nA=26nB=26 Sample means are: x¯A=20.1x¯B=24.1 So, x¯A-x¯B=4 Population standard…

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A:

Q: Suppose that a randomized comparative experiment studies the effect of diet on blood pressure.…

A:

Q: Initial data from a sample of 100 people suggests that stress increases blood pressure (a positive…

A: Hypothesis test has two statements, they are null and alternate hypothesis. It is the statement of…

Q: Recent incidents of food contamination have caused great concern among consumers. An article…

A: State the given values.

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A:

Q: Fifty boys and Fifty girls face off in a game of darts.  The dependent variable is the number of…

A: We want to find the test statistic and p value

Q: A researcher intends to estimate the effect of a drug on the scores of human subjects performing a…

A: From the provided information,Confidence level = 90%

Q: A sample of 79 female workers and another sample of 51 male workers from a state produced mean…

A:

Q: Has the Percentage of U.S. Adults Who Smoke Decreased since 2007? With data from the 2005-2007…

A: To determine whether the percentage of U.S. adults (18 and older) who smoke is less than 20% this…

Q: 95% confidence interval for the average increase of height.

A: Given that  In year 1970 In year 2020 Mean (μ1)=30  Mean (μ2) = 31.5  Variance (σ12) = 4.5…

Q: A therapist would like to evaluate an intervention for treating depression.  A sample of n = 20…

A: From the provided information, Sample size (n) = 20 Level of significance (α) = 0.05 Mean difference…

Q: Compute the P-value for the test statistic for Ava's hypothesis test using software. You may find…

A: Given information n = 33 r = 0.431481 Test statistic is given by

Q: A union of restaurant and foodservice workers would like to estimate the mean hourly wage, μ, of…

A:

Q: Two groups of individuals were compared with respect to a high carbohydrate low- fat diet (LF) and a…

A: Given:     x¯ 1=47.3x¯2=19.3n1=12n2=13s1=28.3s2= 25.8

Q: If a treatment is expected to decrease scores on a variable for which the mean is expecte

A: From the given information, If a treatment is expected to decrease scores on a variable. The mean is…

Q: 1. A researcher is interested in whether North Americans are able to identify emotions correctly in…

A: Given information: The accuracy rating of adult North Americans follows X~Nμ=82,σ2=20. The sample…

Q: players, good hip range of motion results in improved performance and decreased body stress. A…

A: Given Data : For Sample 1 x̄1 = 75.8 s1 = 5.6 n1 = 40 For Sample 2…