A geography test was given to a simple random sample of 500 high-school students in a certain largeschool district. One question involved an outline map of Europe, with the countries identified onlyby number. The students were asked to pick out Great Britain and France. As it turned out, 65.6%could find France, compared to 70.4% for Great Britain.Select all statements below that are true.Students are different in recognizing France versus Great Britain, and this difference is statistically significant.Each ticket in the box model corresponds to a student and has two values, one for the ability to pick Franceand another for Great Britain. The values can be 0 or 1.This is an example of randomized treatment-control experiment.The z-test is not valid because there is dependence between observations in France and Great Britain groups.

The number of individuals who participated in the investigation is 500. The individuals were asked…

Answered: A geography test was given to a simple…

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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Similar questions

For which of the following situations would a sample be used versus a population? Select all that apply. a A biologist is interested in the average wingspan of hawks in the United States. b A researcher is interested in the average birth weight of newborn babies born in the United States. c A manager is interested in the average number of words typed per minute by five employees. d An economist is interested in the average income of families who live in a specific zip code.
Use the following results from a test for marijuana use, which is provided by a certain drug testing company. Among 140 subjects with positive test results, there are 24 false positive results. Among 152 negative results, there are 3 false negative results. Complete parts (a) through (c). (Hint: Construct a table.) a. How many subjects were included in the study? The total number of subjects in the study was 292. b. How many subjects did not use marijuana? A total of 173 subjects did not use marijuana. c. What is the probability that a randomly selected subject did not use marijuana? The probability that a randomly selected subject did not use marijuana is ☐ (Do not round until the final answer. Then round to three decimal places as needed.)
A researcher wants to know if hair color is associated with intelligence. To this end, the researcherrecruits 58 blonds and 59 brunettes. The researcher then assesses each person’s intelligence and comesup with the following results. In the blond group, there are 30 with below-average intelligence, 15 withaverage intelligence, and 13 with above-average intelligence. In the brunette group, there are 25 withbelow-average intelligence, 17 with average intelligence, and 17 with above-average intelligence. How many total participants were involved in the hair color and intelligence study? How many participants were below-average in intelligence in the hair color and intelligence study?
A human resources manager for a company had a choice of how to administer an aptitude test for employee recruits. The New form of the test was administered via computer. The Old form had the same content, but was delivered via paper and pencil. The manager wanted to know if the tests were equivalent in terms of mean scores. If they were equivalent, the manager could give the test by either method, but if they were not equivalent, the manager would have to stick with one administration method in order to be fair to all recruits taking the test. The manager formed his hypotheses, and set an alpha level of .05. The results of a hypothesis test using the two administration methods is shown below. What should the manager do? t-Test: Two-Sample Assuming Equal Variances New Old Mean 15 11.1 13.33333 18.76667 Variance Observations 10 10 Pooled Variance 16.05 Hypothesized Mean Difference df 18 t Stat 2.176768 P(T<=t) one-tail t Critical one-tail 0.021526 1.734064 P(T<=t) two-tail t Critical…
The number of books checked out from the library from 25 students are as follows: 0; 0; 0; 2; 2; 3; 3; 4; 4; 5; 5; 6; 7; 7; 8; 8; 8; 8; 10; 10; 10; 11; 11; 12; 12 Find the mode. Mode = Number
A population has a mean of 377 and a mode of 333. If 17 points are added to each, which is a true choice? a.The mean will increase by 17, and the mode will stay the same. b.The mean and the mode will both stay the same. c.Both the mean and mode will increase by 17. d.The mean will stay the same, and the mode will increase by 17.
Dr. Caldwell was also interested in learning whether the anxiety of child victims is related to whether they testify in court. She conducted another research study in which she compared the anxiety levels of 10 children who testified to the anxiety levels of 10 children who did NOT testify. She measured the children’s anxiety using the same test described earlier - the Beck Anxiety Inventory for Children (BAI-C). The scores of the 20 children are as follows: TestifiedDid NOT Testify 5554 5762 5072 6269 6673 4858 7175 6063 7070 5266 11. Conduct an independent measures t-test to determine whether Dr. Caldwell can conclude that there is a significant difference between child victims who testify and those who don’t with respect to anxiety. Show all 4 steps of hypothesis testing, and calculate a measure of effect size. Use a 2-tailed test with α = .05 Step 1: Step 2: Step 3: show calculations and values for: M and SS for each group, the pooled…
A professor has a class with five recitation sections. Each section has 18 students. The question is whether or not the average test score is significantly different for any of the sections. Group-1 Group-2 Group-3 Group-4 Group-5 86 56.8 78 65 41.8 62.5 52.2 83.5 70.3 60.3 75.2 61.1 88.8 75.3 53.2 44.6 51.3 70 87.3 86 42.2 62.1 49.9 76.6 49.7 65.8 75.1 65.7 44.4 49.8 81.3 49.7 57.8 78.8 62.9 84.9 60.1 58.3 57.1 55.8 55.5 66.5 57.5 64.8 73.7 75.9 64.2 61.4 75 75 59 80.9 64.5 84.9 63.2 69.9 60.2 77.1 71.8 69.9 59.3 51 76.2 81.6 62 48 71.7 69.3 66.5 50.8 66 56.9 88.1 75.3 58.4 70.3 63.7 73.9 67.5 46.2 62.2 44.3 60.1 90.2 61.8 67.5 40.5 68.2 54.9 71.7 Conduct a test to determine if the group means are equal using α=0.02α=0.02. Summary statistics:F-ratio (F-test statistics) = p-value = (report accurate to at least 4 decimal places)What is the measure of effect size ω2ω2 ? This is on the Excel sheet and is also a measure of the…
The investigator of a market reports the following data. Of 1000persons questioned, 811 liked chocolates, 752 liked bonbons and 418 liked lollipops, 570 chocolates and bonbons, 356 chocolates and lollipops, 348 bonbons and lollipops, and 297 all three types of sweets. Show that this information contains an error.
In politics, marketing, etc. we often want to estimate a percentage or proportion p. One calculation in statistical polling is the margin of error - the largest (reasonble) error that the poll could have. For example, a poll result of 72% with a margin of error of 4% indicates that p is most likely to be between 68% and 76% (72% minus 4% to 72% plus 4%). In a (made-up) poll, the proportion of people who like dark chocolate more than milk chocolate was 37% with a margin of error of 2.5%. Describe the conclusion about p using an absolute value inequality. . That lets you type in a vertical bar | to represent absolute values. Also, when you type in < and then =, the symbolic entry option will automatically convert that to ≤ . In the same way, if you type in > and then =, the symbolic entry option will automatically convert that to ≥. Be sure to use decimal numbers in your answer (such as using 0.40 for 40%).
A student who believes that his or her performance on tests is influenced by wearing a lucky hat is using the method of? A. Empiricism B. Faith C. Tenacity D. Authority
In a college of 100 students, a financial aid survey was done. The three financial aids were Government grants, Private Scholarships and College aids. 49 received government grants 55 received private scholarships 43 received college aid 8 received funds from all three 23 received government grants and private scholarships 18 received government grants and college aid 28 received private scholarship and college aid i. Represent the data in a Venn Diagram. ii. Find out the number of students who didn’t receive any of the scholarships.

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