A. For this test, what is the critical value of an a-level of 0.05? A species of leafcutter ant in southern Brazil (4cromyrmex aspersus) has been observedto carry cut pieces of leaf tissue with a mean area of 15.3 mm2. These cut pieces of leavesare used to cultivate a fungus in their underground colonies. Studying a single colony, aresearcher measures 30 cut leaves with a mean area of 17.8 mm with a standarddeviation of 6.5 mm2. Are the cut pieces this colony carries significantly different fromother colonies?

Answered: Image /qna-images/answer/11a1ec0c-4e65-44ca-80bb-a871e1690b31.jpg

Answered: A species of leafcutter ant in southern…

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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me of a CIA agent is greater than $81,623 (based on data from payscale.com) given that the test statistic is t = 1 20 for a sample of 40 CIA agents. 4. P-Value Find the P-value in a test of the claim that the mean annual 1.304
Which of the following measures is easily affected by extreme data or values? (A) Median B Range C) Mode Standard Deviation
If a standard deviation is 1.4 away from a mean of 7.2 what is the z score of an x value of 10
A sample of N = 9 individuals participates in a repeated measures study that produces a sample mean difference of X = 4.25 with SS = 128 for the difference scores. Is this mean difference large enough to be considered a real positive effect?
For a sample with a standard deviation of s = 8, a score of X = 42 corresponds to z = –0.25 what is the mean
Consider the scenario ai from the previous question. Suppose you take an SRS of 50 avocados and find that the mean is 1.1 inches, which yields a p-value of 0.0542. What conclusion would you draw at the =0.05 level? At the =0.10level?
You suspect that people living in urban areas produce on average more garbage (X)than those living in rural areas (Y). To verify this opinion, you draw two samples and collect information on the amount of garbage produced in a month (measured in kilos). The first sample, made of 8 subjects living in an urban area, provides a sample mean equal to 40.5 and a sample standard deviation equal to 5.6; in the second sample, made of 10 subjects living in rural areas, the sample mean is 35.6 and the sample standard deviation is 7.5. It is assumed that the two populations are normal with the same unknown variance.Test the null hypothesis that the two population means are equal against a one-sided alternative according to which people living in urban areas produce on average more garbage than those living in rural areas. Use a 1% significance level.
I would like to know how to solve these questions with a step-by step. The owner of the store has determined that home delivery will be successful if the average time spent on the deliveries does not exceed 34 minutes. The owner has randomly selected 23 customers and has delivered pizzas to their homes in order to test if the mean delivery time actually exceeds 34 minutes. Suppose the P-value for the test was found to be 0.0290. State the correct conclusion. Select one: A. At α = 0.02, we reject H0. B. At α = 0.025, we fail to reject H0. C. At α = 0.05, we fail to reject H0. D. At α = 0.03, we fail to reject H0.
A researcher is interested in the impact of joining a weight loss program in the past 12 months on the individuals weight loss. The analysis was restricted to people aged 16 and older who answered yes to the question "During the past 12 months, have you tried to lose weight?" about 5% of the sample has joined a weight loss program in the past year. 1. The researcher has decided to use propensity score analysis. What is be the appropriate estimator this analysis: Average treatment effect, Average treatment effect on the treated or average treatment effect on the untreated? Provide a justification for your choice
Under what circumstances would a score that is 15 points above the mean be considered an extreme score? O when the population mean is much smaller than 15 O when the population standard deviation is much larger than 15 O when the population mean is much larger than 15 O when the population standard deviation is much smaller than 15

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