With double-digit annual percentage increases in the cost of health insurance, more and more workers are likely tolack health insurance coverage (USA Today, January 23, 2004). The following sample data provide a comparison ofworkers with and without health insurance coverage for small, medium, and large companies. For the purposes ofthis study, small companies are companies that have fewer than 100 employees. Medium companies have 100 to999 employees, and large companies have 1000 or more employees. Sample data are reported for 50 employees ofsmall companies, 75 employees of medium companies, and 100 employees of large companies.Health InsuranceSize of CompanyYesNoTotalSmall381250Medium611475Large9010100a. Conduct a test of independence to determine whether employee health insurance coverage is independent of thesize of the company. Use a = .05. Use Table 12.4.Compute the value of the X2test statistic (to 2 decimals).The p value is between .05 and .10What is your conclusion?Cannot reject the assumption that health insurance coverage and size of the company are independent Vb. The USA Today article indicated employees of small companies are more likely to lack health insurance coverage.Calculate the percentages of employees without health insurance based on company size (to the nearest wholenumber).Small%Medium%Large%Based on the percentages calculated above, what can you conclude?Small companies have a higher percentage of no coverage than large and medium companies V

a. Null hypothesis: The employee health insurance coverage is independent of the size of the…

Answered: With double-digit annual percentage…

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 Ms. Lisa Monnin is the budget director for Nexus Media Inc. She would like to compare the daily travel expenses for the sales staff and the audit staff. She collected the following sample information. Sales ($) Audit ($) 125 137 147 162 136 142 128 107 130 141 141 108 140 At the 0.01 significance level, can she conclude that the mean daily expenses are greater for the sales staff than the audit staff? Click here for the Excel Data File 1. State the decision rule. (Round your answer to 3 decimal places.) Reject Ho if t> 2. Compute the pooled estimate of the population variance. (Round your answer to 2 decimal places.) Pooled variance 3. Compute the test statistic. (Round your answer to 3 decimal places.) Value of the test statistic 4. State your decision about the null hypothesis. (Click to select) Ho: H₂ Ha 5. Estimate the p-value. (Round your answers to 3 decimal places.) p-value (Click to select) Sales 125 137 147 162 136 142 Audit 128 107 130 141 141 108 140
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The owner of Maumee Ford-Volvo wants to study the relationship between the age of a car and its selling price. Listed below is a random sample of 12 used cars sold at the dealership during the last year. Car Age (years) Selling Price ($000) 1 11 12.1 2 8 10.5 3 14 5.7 4 17 4.9 5 9 5.0 6 8 13.4 7 10 10.5 8 14 9.0 9 13 9.0 10 17 4.5 11 6 12.5 12 6 11.5 Click here for the Excel Data Filea. Determine the regression equation. (Negative amounts should be indicated by a minus sign. Round your answers to 3 decimal places.) a= b= Estimate the selling price of an 7-year-old car (in $000). (Round your answer to 3 decimal places.) Interpret the regression equation (in dollars). (Round your answer to the nearest dollar amount.)
In this same passage on Flying Home Holidays on Time, answer the questions carefully to get the correct answers.
Cite a statistical experiment and its sample space.
When an audit must be conducted that involves a tedious examination of a large inventory, the audit may be very costly and time consuming if each item in the inventory must be examined. In such situations, the auditor frequently obtains a random sample of items from the complete inventory and uses the results of an audit of the sampled items to check the validity of the company's financial statement. A large company’s financial statement claims an inventory that averages $600 per item. The following data are the auditor’s assessment of a random sample of 75 items from the company’s inventory. The values resulting from the audit are rounded to the nearest dollar. Estimate the mean value of an item in the inventory using a 95% confidence interval. Is there substantial evidence (a 5 .01) that the mean value of an item in the inventory is less than $600? What is the target population for the above inferences? Would normal distribution–based procedures be appropriate for answering the…
You may need to use the appropriate appendix table or technology to answer this question. In the past, 19% of all homes with a stay-at-home parent, the father is the stay-at-home parent. An independent research firm has been charged with conducting a sample survey to obtain more current information. (a) What sample size is needed if the research firm's goal is to estimate the current proportion of homes with a stay-at-home parent in which the father is the stay-at-home parent with a margin of error of 0.03? Use a 95% confidence level. (Round your answer up to the nearest whole number.) (b) Repeat part (a) using a 99% confidence level. (Round your answer up to the nearest whole number.) Need Help? Read It option esc ! 1 T Q A Z 96 2 W S X 88 command Watch It O #3 E Master It a D C $ 4 R F ~ ♫ % 5 V T G m MA 6 MacBook Pro B Y H & 7 U N D W * 8 J P 1 T M ( K 1 & O **** ) O 1 H L cricut P V command T { x + 11 ? option } រ dele
Identify which statistical test is to be used in the following problems. 1. Is the given sample mean of 74 production units per day equal to the population mean? 2. Would thirty high school graduating students change in their self-concept after knowing they had passed an important test? 3. Is employee’s rank correlated with efficiency rating? 4. Did the method of teaching interact with students’ learning styles? What is the interaction effect of the method of teachings and medium of instruction on the achievement of students in Probability and Statistics? 5. Is IQ level associated with gender? 6. Is there a significant difference between the two sections of Senior High School in terms of academic achievement in Calculus?
II. Statistical Data Analysis: Solve each given problem using the appropriate test statistic. 1. A survey of public opinion about the criminal justice system asked respondents to complete the following statement: "The criminal justice system treats offenders...." The researchers found the following distribution of responses by gender of the respondent: Gender of Respondent Female Male Too Lenient 15 40 About Right 50 35 Too Harsh 35 25 a. Is there a relationship between the gender of the respondent and perceptions of punishment severity? Use a 5% level of significance and outline each of the steps required in a test of statistical significance. b. Would your answer be different if the significance level were 0.01? Show the proof of your answer. c. What can you conclude about the relationship between gender and perceptions of punishment severity?
A statistical program is recommended. Jensen Tire & Auto is in the process of deciding whether to purchase a maintenance contract for its new computer wheel alignment and balancing machine. Managers feel that maintenance expense should be related to usage, and they collected the following information on weekly usage (hours) and annual maintenance expense (in hundreds of dollars). Weekly Usage (hours) Annual Maintenance Expense 13 17.0 10 22.0 20 30.0 28 37.0 32 47.0 17 30.5 24 32.5 31 39.0 40 51.5 38 40.0 (a) Develop the estimated regression equation that could be used to predict the annual maintenance expense (in hundreds of dollars) given the weekly usage (in hours). (Round your numerical values to two decimal places.)
The increasing annual cost (including tuition, room, board, books, and fees) to attend college has been widely discussed (Time.com). The following random samples show the annual cost of attending private and public colleges. Data are in thousands of dollars. Private Colleges 53.8 44.2 44.0 32.3 43.0 31.6 45.8 37.8 51.5 41.0 Public Colleges 20.3 22.0 28.2 15.6 24.1 28.5 22.8 25.8 18.5 25.6 14.4 21.8 (a) Compute the sample mean (in thousand dollars) and sample standard deviation (in thousand dollars) for private colleges. (Round the standard deviation to two decimal places.) sample mean $ thousand sample standard deviation $ thousand Compute the sample mean (in thousand dollars) and sample standard deviation (in thousand dollars) for public colleges. (Round the standard deviation to two decimal places.) sample mean $ thousand sample standard deviation $ thousand (b) What is the point estimate (in thousand dollars) of the difference between the two population…
The owner of Maumee Ford-Volvo wants to study the relationship between the age of a car and its selling price. Listed below is a random sample of 12 used cars sold at the dealership during the last year. Age (years) Selling Price ($000) Car 1 9 12.0 2 8 10.9 3 10 4.6 4 12 4.3 9 5.6 6 8 13.5 7 9 8.9 8 11 9.7 9 10 9.7 10 12 2.7 11 6 10.6 12 6 8.9 %media:excel.png% Click here for the Excel Data File a. Determine the regression equation. (Negative values should be indicated by a minus sign. Round your answers to 3 decimal places.) a = b = b. Estimate the selling price of an 12-year-old car (in $000). (Round your answer to 3 decimal places.) Selling price c. Interpret the regression equation (in dollars). (Round your answer to the nearest dollar amount.) For each additional year, the car price decreases in value.

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