**Survey on Underaged Smoking in California**A survey to determine the extent of underaged smoking in California was conducted. A total of 2,699 adults were approached by a group of 558 underaged smokers. The distribution of adults approached across different age groups is presented below. The data explores the belief that underaged smokers are more likely to ask younger adults for tobacco. The question asked is whether the proportion of adults approached is evenly distributed among the age groups listed.| Age | # of Adults Approached ||-----|------------------------|| 18–19 | 2,099 || 20–24 | 1,493 || 25–34 | 724 || 35–54 | 470 || 55+ | 152 |

Chi square test statistic is used to measure whether there is any significant relationship between…

Answered: 3. A survey to determine the Extent of…

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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4. How many determiners are part of the sample underlying the following statistical model? P(adj|det) = 0.2 P(noun adj) = 1 P(noun det) = 0.8 20 nouns 4 adjectives and ? determiners.
17. According to the CDC website, 59% of 18 to 25 year-olds in the United States drink alcohol. From a sample of 149 students, 100 admitted to drinking alcohol. Is the proportion who drink different from national proportion of 0.59? (Use a 0.05 level of significance). (A) Yes (B) No
1. Mr. Anthony, a senior high school teacher, wants to determine whether the length of teachng experience is associated with the performance rating given by the school principal, wteh n based on a scale of 1 to 5, with 1 being the lowest and 5 the highest. He interviewed seveit randomly selected senior high school teachers and the data were tabulated as follows. % Teacher Length of Teaching Experience (Years) Performance Rating 1. 3 4.00 2 4.08 3 10 4.50 4 2. 3.80 25 4.90 16 4.75 6. 20 4.90 a. Compute the correlation coefficient of the two variables. b. Find the coefficient of determination. Interpret the result.
1. A marketing manager for a cell phone company claims that more than 35% of children aged 10 – 11 have cell phones. In a survey of 5000 randomly selected children ages 10 – 11, 1805 of them had cell phones. Based on the sample data, can you conclude that the manager's claim is true? Use a 1% level of significance. A. Compute the p-value. B. Make a decision. C. Interpret the results.
5. A credit score is used by credit agencies (such as mortgage companies and banks) to assess the creditworthiness of individuals. Values range from 300 to 850, with a credit score over 700 considered to be a quality credit risk. According to a survey, the mean credit score is 702.9. A credit analyst wondered whether high-income individuals (incomes in excess of $100,000 per year) had higher credit scores. He obtained a random sample of 32 high-income individuals and found the sample mean credit score to be 719.1 with a standard deviation of 80.6. Conduct the appropriate test to determine if high-income individuals have higher credit scores at the a = 0.05 level of significance. State the null and alternative hypotheses. Ho: H (1) H: μ (2) (Type integers or decimals. Do not round.) Identify the t-statistic. to = (Round to two decimal places as needed.) Identify the P-value. P-value = (Round to three decimal places as needed.) Make a conclusion regarding the hypothesis. (3) the null…
1. The percentage of 12- to 17-year-olds who reported talking at least once in the past year with their parents about the dangers of drug, tobacco, or alcohol is 60% nationally. A state youth council believes this proportion is higher in their state, where there has been an intense media campaign about this issue. A survey of randomly chosen students from across the state shows 1032 of 1642 students reporting they are having these conversations with their parents. Is there evidence that the percent of students using drugs, tobacco or alcohol in this state is above the national rate?
1. A car dealer wants to determine whether there is a difference in gas mileage between six car models. The ANOVA table for the data is given below. [Seorang pengusaha kereta ingin menentukan sama ada terdapat perbezaan perbatuan gas di antara 3 model kereta. Jadual ANOVA bagi data berkenaan seperti di bawah.] Source [Sumber] [Darjah kebebasan] [Jumlah kuasa dua] [Min kuasa dua] Treatment Degress of freedom Sum of squares Mean square F a 74 d f |[Rawatan] Error [Ralat] Total 35 195 Jumlah] (a) Complete the ANOVA table. [Lengkapkan jadual ANOVA tersebut.] (b) Write the hypotheses and determine whether there is a significant difference between mean gas mileage by different car models at a = 0.05. [Tulis hipotesis dan tentukan sama ada terdapat perbezaan yang signifikan antara perbatuan purata gas oleh model kereta yang berbeza pada a = 0.05.] %3D
14. A total of 12 participants were randomly assigned to one of three treatment groups: antidepressant medication ("drug"), weekly psychotherapy ("therapy”), or no treatment ("control"). Depression scores were collected 8 weeks after treatment began. We want to know how effective the depression treatments were (that is, do the mean depression scores differ between groups?). Drug Drug Drug b) Determine what test to use. Drug Therapy Therapy Therapy Therapy Control Control Control Control a) What are the null and alternative hypotheses? 8 9 14 6 12 7 15 8 22 25 18 20 c) Determine alpha, how many tails are there, what are the df and find a critical value.
3. Consider the following set of data, which represents a simple random sample of heights (in inches) of full-grown corn plants in Horseyetown, WI: (78.5, 88.8, 76.2, 73.0, 79.5, 66.9, 72.4, 86.6, 67.6, 73.5, 72.6, 72.6, 80.0, 69.1, 79.1, 73.9, 72.3, 83.3, 64.3, 69.1) Round your answers to 2 decimal places. A. Calculate the range. B. Calculate the sample mean. C. Calculate sample statistics to estimate the population standard deviation and variance of all full-grown corn plants in Horseyetown, WI.
8. a. Five group of students that consist of 10, 8, 11, 13 and 9 individuals. They consumed the mean average time in computer programming were 18, 33, 11, 42 and 53 hours respectively. Find the overall average time consuming the student groups in computer programming. b. Twelve homes in one city were underinsured on the average of $5,000, 24 homes in another city were underinsured on the average of $6,200 and 14 homes in a third city were underinsured on the average of $6,900. Find the overall average amount of the underinsured homes. c. A writer earns a mean average of $15.00 per hour for 4 hours of work, $17.50 per hour for 2 hours of work, $13.33 per hour for 3 hours and $14.00 per hour for 1 hour. What is the overall average earning per hour of the writer?
6. If a student has taken ten exams in five different courses. The scores on the ten exams were 100, 78, 60, 96, 71, 81, 71, 94, 51, 73 then find all measures of central tendency and dispersion for these data
8. Because of the popularity of movies as an entertainment medium for college students, you plan to do a national study of the average cost of a movie ticket. If you assume that o= $0.50, what sample size would you have to take to be 95% confident that your estimate was within $0.25 of the true mean ticket prices? %3D

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