Answered: why does doubling the recapture sample…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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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
What do we call variance in the ANOVA equation, and what notation do we use to represent them?
A pooled variance estimate is useful for two-sample hypothesis tests of a normal mean when the underlying population variances are considered unequal. True False
what does MS stand for in analysis of variance?
Can we use the standard deviation to compare variability of two or more datasets? Is the z-score a real measure of dispersion? If the data is highly skewed, can we still rely on the kurtosis coefficient?
A shareholders' group is lodging a protest against your company. The shareholders group claimed that the mean tenure for a chief exective office (CEO) was different 10 years. A survey of 75 companies reported in The Wall Street Journal found a sample mean tenure of 8.1 years for CEOs with a standard deviation of s= 4.4 years (The Wall Street Journal, January 2, 2007). You don't know the population standard deviation but can assume it is normally distributed.You want to formulate and test a hypothesis that can be used to challenge the validity of the claim made by the group, at a significance level of α=0.001. Your hypotheses are: Ho:μ=10 Ha:μ≠10What is the test statistic for this sample? test statistic = (Report answer accurate to 3 decimal places.)What is the p-value for this sample? p-value = (Report answer accurate to 4 decimal places.)The p-value is... less than (or equal to) α greater than α This test statistic leads to a decision to... reject the null accept the…
A sample of 20 observation is selected from a normal population, the sample mean is 2.78 and the standard deviation is 0.83. Another sample of 18 observation was selected and the mean is 2.63 with standard deviation of 0.75. Test at 0.01 level of significance. What is the computed value and decision.
What raw score for age corresponds to a z- score of +4.50, given a mean of 12.0 years and a standard deviation of 4.0 years?
A certain type of thread is manufactured wen a mean tensile strength of 75.3 klograms and a standard deviation of 4.8 kilograms. How is the variance of the sample mean changed when the sample size (a)increased from 64 to 900 ? (b) decreased from 256 to 36 ?
Explain the effect of heterogeneity of variance on the Type I error rate?
If, in an analysis of variance, you find that MSTR is greater than MSE, why can you not immediately reject the null hypothesis without determining the F ratio and its distribution? Explain.
How does increasing the alpha/significance level increase the power of a statistical test?

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why does doubling the recapture sample increase the standard deviation and why does doubling the marked sample in rhe recapture method lower the standard deviation ?