**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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5. A certain calculator circuit board is manufactured in lots of 200. If 1% of the the boards are defective, what are the mean and standard deviation of the number of defects in each lot?
2. In studying the effect of a drug for treating patients with respiratory problems, a researcher obtained a sample of 12 consenting patients, who, after discussion with their doctor, chose a respiratory drug they would receive. Patients' respiratory tests were assessed twice over a two-month period after initiating the treatment. Research question: The researcher wants to know if there is a significant difference between the group in their second test and those that didn't take the drug in their overall mean of 3.35 in average respiratory scores with a standard deviation of .08. Is there a difference between the two means - does the drug work? Carry out 9 steps of hypothesis testing. Respiratory Test 2 3.4 3.4 3.3 3.4 3.3 3.3 3.3 3.2 3.2 3.2 3.2 3.3 Σ-39.5
d) One of the primary end points/outcomes the study listed was the number of days that it took to reach a 50% reduction in symptoms as reported on a 12-Symptom scale. In Table 2, you can see that the statistical test they used to evaluate differences between groups for this end point produced a p-value of 0.97. Please provide an interpretation of this p-value, explaining what it means in terms of whether significant differences exist between the groups in the number of days it took to achieve a 50% reduction in symptoms on the 12-Symptom scale.
18. "38% of adults in the United states regularly visit a doctor" This conclusion was reached by a college student after she had questioned 520 randomly selected members of her college. What is wrong with her survey?
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
10. The Carolina Tobacco Company advertised that its best-selling nonfiltered cigarettes contain at most 40 mg of nicotine, but Consumer Advocate magazine ran tests of 10 randomly selected cigarettes and found the amounts (in mg) shown in the accompanying list. It's a serious matter to charge that the company advertising is wrong, so the magazine editor chooses a significance level of a = 0.01 in testing her belief that the mean nicotine content is greater than 40 mg. Using a 0.01 significance level, test the editor's belief that the mean is greater than 40 mg. 47.3 39.3 40.3 38.3 46.3 43.3 42.3 49.3 40.3 46.3
5. Student use of cell phones during class is perceived by many faculty to be an annoying but perhaps harmless distraction. However, the use of phone to text during an exam is a serious breach of conduct. The article “The Use and Abuse of Cell Phones and Text Messaging During Class: A Survey of College Students" (College Teaching, 2012: 1-9) reported that 27 of the 267 students in a sample admitted to doing this. Using the appropriate statistical method, it is estimated that 6.5% to 13.7% of college students had texted during an exam. (a) Which part of this example gives a descriptive summary of the data? (b) Which part of this example draws an inference about a population?
17
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.

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