A researcher thinks that how often someone reports visiting a science museum in a year isdifferent for people with children and people with at least one child. They get the followingoutput:Group StatisticsStd.Std.ErrorRespondent's childrenVisits to No childrenN797MeanDeviationMean0.271.0770.038sciencemuseum1 or morechildren20621.654.9970.969Independent Samples TestLevene's Testfor Equality ofVariancest-test for Equality of MeansFVisits toEqual4.492Sig.0.034 -1.231tdf2857Sig. (2-tailed)0.218sciencemuseumvariancesassumedEqual-1.979 2067.3800.048variances notassumed1.What is the research hypothesis? Is this one-tailed or two-tailed? (note how theproblem is worded to indicate if it is one or two tailed)

The objective of the question is to identify the research hypothesis and determine whether the test…

Answered: A researcher thinks that how often…

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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This question refer to the following data: Sentence Year. 13 10 8 6 4 7 14 9. 7 What is the standard deviation? (Round off to two decimal places if necessary)
Suppose you are asked to toss a coin 16 times and calculate the proportion of the tosses that were heads. a. What shape would you expect this histogram to be and why? b. Where you do expect the histogram to be centered? c. How much variability would you expect among these proportions? d. Explain why a Normal model should not be used here.
If African American students scored at the 50th percentile rank and their white counterparts scored at least one standard deviation (s.d.) ahead of them what is the lowest percentile rank of the white students? a. 84 b. 69 c. 93 d. 98
The college physical education department offered an advanced first aid course last summer. The scores on the comprehensive final exam were normally distributed, and the z-scores for some of the students are shown below. Robert 1.05 Juan 1.51 Haley −1.95 Joel 0.00 Jan −0.67 Linda 1.57 (a) If the mean score was ? = 151 with standard deviation ? = 16, what was the final exam score for each student?
. A university examines the variability in the math scores of students accepted to the business and engineering schools. The table below presents sample data from the most recent incoming class.Engineering BusinessSample Standard Deviation 122.4 106.5Sample Size 16 19Perform a hypothesis test to determine whether the variation in math scores is different if ? = 0.05.
The Human Development Report 2013, published by the United Nations, showed life expectancies by country. Values reported for some countries in Western Europe and values reported for some countries in Africa are available in the accompanying table. a. Which group (Western Europe or Africa) of life expectancies do you think has the larger standard deviation? Why? b. Find the standard deviation for each group. Compare them to illustrate that s is larger for the group that shows more variability from the mean. Click the icon to view the life expectancy data. X Life Expectancy Data a. Which group do you think has the larger standard devia European Country Austria O A. The Africa group should have the larger standard d O B. The Western Europe group should have the larger OC. The Western Europe group should have the larger O D. The Africa group should have the larger standard d Life Expectancy African Country 81 Angola Botswana 80 80 Belgium Denmark Finland France 81 83 81 standard deviation…
Question 3 The number of hours worked per week for a sample of ten students is shown below. Student Hours 1 39 28 10 16 26 34 38 9. 4 10 32 1. Determine the mean, median, and mode. 2. What is the range of the data for the hours worked? 3. What is the standard deviation for the number of hours worked? 2. 3. 4, 7, 8.
MC Qu. 10-64 Sales at a fast-food restaurant average... Sales at a fast-food restaurant average $6,000 per day. The restaurant decided to introduce an advertising campaign to Increase daily sales. In order to determine the effectiveness of the advertising campaign, a sample of 49 day's sales were taken. The sample showed average daily sales of $6,300. From past history, the restaurant knew that its population standard deviation is about $1,000. If the level of significance is 0.01, have sales increased as a result of the advertising campaign? Multiple Choice Fail to reject the null hypothesis. Reject the null hypothesis and conclude the mean is higher than $6,000 per day. Reject the null hypothesis and conclude the mean is lower than $6,000 per day. Reject the null hypothesis and conclude that mean equal to $6,000 per day.
Personnel tests are designed to test a job applicant's cognitive and/or physical abilities. A particular dexterity test is administered nationwide by a private testing service. It is known that for all tests administered last year, the distribution of scores was approximately normal with mean 72 and standard deviation 8.5. a. A particular employer requires job candidates to score at least 76 on the dexterity test. Approximately what percentage of the test scores during the past year exceeded 76? b. The testing service reported to a particular employer that one of its job candidate's scores fell at the 98th percentile of the distribution (i.e., approximately 98% of the scores were lower than the candidate's, and only 2% were higher). What was the candidate's score? a.
3. A researcher collected the wait times at the Department of Motor Vehicles for 5 days. The data are normally distributed with a mean of 73 minutes and a standard deviation of 15.6 minutes. What percentage of patrons had a wait time between 45 and 60 minutes? Standard Normal Table GeoGebra Graphing Calculator A.16.7% B.20.3% C.83.3% D.3.7%
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Which of the following five statistics are commonly used together to determine the shape of a distribution? Five answers correct. All or nothing credit. 1. The minimum 2. Variance 3. The 2nd quartile 4. The maximum 5. Coefficient of variation 6. Interquartile range 7. The 1st quartile 8. The 3rd quartile 9. Range 10. Standard deviation

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