NumberStylesH.KMThe South African government is concerned about the high illiteracy rates amongst adults in South Africa.They wish to estimate the true proportion of adults (over 18 years of age) in South Africawho are illiterate (that is, that cannot read or write in at least one language).A random sample of 10 000 adults were interviewed, and 1 107 of them were found to be illiterate.Using information from the given scenario above determine the following:(1.1) Type of data(1.2) Population size(1.3) Literate adults(1.4) Sample size(1.5) Iliterate rate(1.6) Variable

The type of data used in the problem is Interval type as there is no absolute zero in the data but…

Answered: The South African government is…

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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If you were to draw 15 random samples of 100 residents in a city you may get 15 different mean values simply by chance. These expected differences across samples may be defined as: a. a statistical effect b. sampling error c. random error d. probability
3) A Chi-square test can be done to test all of the following EXCEPT which of the following? If the mathematical model accurately predicts the pattern of data values observed. If the mathematical model accurately predicts the total number of values observed. If traits exhibit independence with regards to the probability of seeing their combinations in individuals in a population. If individuals from different populations have the same probability of possessing various traits. If the mathematical model accurately predicts the proportions of data values observed.
5.
9. An article in the Philippine Daily Inquirer discusses the dangers of obesity. The article claims that in the middle managerial positions, obese people get (on average) smaller paychecks than non-obese people. Suppose that you want to test this claim, and you have obtained the following two random samples of employees (data are in thousands of pesos per month): Obese: 45 54 39 67 33 62 39 50 48 51 37 61 70 35 42 40 Non-obese: 54 69 36 77 56 30 72 80 44 73 55 60 49 Test the hypothesis using the 0.05 level of significance.
1. A researcher uses a one-sample t-test to test a sample mean based on 27 scores against a hypothesized population mean. What is the degrees of freedom for this t-test? A. 26 B. 28 C. 29 D. 27 2. If a researcher takes a large enough sample, he/she will almost always obtain: A. consequentially significant results B. virtually significant results C. practically significant results D. statistically significant results
2. Jim Miller works in the personnel department for a car company. He is told by his supervisor to investigate the difference in the average number of sick days between blue collar workers and whitecollar workers. So he obtained a random sample of 9 blue collar workers and a random sample of 9 white collar workers. He records the results below.At 10% level of significance, is there sufficient evidence to indicate a difference in mean sick days between blue collar workers and white collar workers.
Suppose the manager of a shoe store wants to determine the current percentage of customers who are males. How many customers should the manager survey in order to be 92% confident that the estimated (sample) proportion is within 8 percentage points of the true population proportion of customers who are males? z0.10 z0.05 z0.04 z0.025 z0.01 z0.005 1.282 1.645 1.751 1.960 2.326 2.576 Use the table of values above.
Consider a researcher who is exploring new potential treatments for specific forms of cancer. This researcher is extremely focused on avoiding mistakes in concluding that treatments that may very well be effective are ineffective when conducting their research. What should this researcher do? a. set a higher alpha level b. set a higher sample mean c. set a lower alpha level d. set a lower sample mean
A governmental agency computed the proportion of violent crimes in the United States in a particular year falling into each of four categories. A simple random sample of 500 violent crimes committed in California during that year were categorized in the same way. The following table presents the results. Category U.S.Proportion CaliforniaFrequency Murder 0.018 4 Forcible Rape 0.07 35 Robbery 0.390 218 Aggravated Assault 0.522 243 Can you conclude that the proportions of crimes in the various categories in California differ from those in the United States as a whole? Use the 0.05 level of significance and the P-value method with the TI-84 Plus calculator. (b) Find the P-value. Round the answer to at least four decimal places.
1. A dog groomer is often asked if small dogs bark more than larger dogs. To test this, he logs the number of separate barking episodes per day for three size dogs: small, medium, and large. In a separate file you will find the number of barking episodes for 12 dogs. On average, small dogs barked the most Mean: 7.25 On average, medium sized dogs barked the least Mean: 2.75 A. Do the different size dogs bark a significantly different number of times? Test with an α = 0.05. B. If appropriate, use Tukey’s HSD post hoc test and report where the differences are. If inappropriate, state why. C. Calculate and interpret the effect size.
1. Americans consume an average of 70 hot dogs per year. A researcher is skeptical of that value and randomly samples 600 people and computes a sample mean of 68.3 hot dogs. a. Which value above is a parameter and which is a statistic? b. If tomorrow you were going to sample 60 people, around what value do you think the sample mean will be? Do you think it will be exactly that value?
Administrators are certain about the effectiveness of the Clearwater Preschool spelling program. The average spelling score is 28 for children of comparative age. The data below are spelling scores from a sample of children from Clearwater Preschool. Scores range from 0 - 40 with higher scores indicating better spelling. What can be concluded with an α of 0.05? A)What is the population? B)What is the sample?

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