You have been asked to estimate the proportion of households in Chicago that have two or more vehicles. a) How many households would you need to sample to be within 4 percent of the proportion of all households in Chicago that have two or more vehicles at a 95% level of confidence. b) You conduct a small preliminary sample, and you obtain a sample pr

You have been asked to estimate the proportion of households in Chicago that have two or more vehicles. a) How many households would you need to sample to be within 4 percent of the proportion of all households in Chicago that have two or more vehicles at a 95% level of confidence. b) You conduct a small preliminary sample, and you obtain a sample pr

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Description: You have been asked to estimate the proportion of households in Chicago that have two or more vehicles. a) How many households would you need to sample to be within 4 percent of the proportion of all households in Chicago that have two or more vehic

A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

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Four scenarios of statistical studies are given below. Decide which study uses a population parameter. Answer O Lakeside Family Dentistry reported that 6 of the 15 patients who came in for a regular cleaning one day had at least one cavity. O As part of her senior project, Kaisa asked 84 of her classmates if they voted in the last presidential election. 39 said yes. O of 351 dog owners who were surveyed, 70 reported owning two dogs. The average finish time for the Ironman, Kona was 11:32 for the 1883 finishers, with an average swim time of 1:14, an average bike time time of 4:14.
Matt Gaetz, a health educator, wants to evaluate the effect of a dental film on the frequency with which children brush their teeth. A random selection of 8 children are used for the experiment. First, a baseline of the number of times the children brush their teeth over a month's period is established. Next, the children are shown the dental film and again the number of teeth brushings are recorded for a month. The following data are recorded. Subject 1 2 3 4 5 6 7 8 After Film 28 29 25 30 25 27 28 24 Baseline 25 28 22 30 26 24 25 22 a. What is the null hypothesis? b. What is the alternative hypothesis c. What is your conclusion, using an alpha of 0.05 (2 tailed)?
Four scenarios of statistical studies are given below. Decide which study uses a sample statistic. A) An estimated 15% of Americans don't use the internet. B) Parkland Hospital performs 15,000 births a year. Of 1000 subjects in a study on multiple births, 38 gave birth to twins. ). A poll of the entire student body found that 32% of students at Wilson Abner College voted in the last presidential election. D) In 2001, 78% of children diagnosed with cancer were in remission after five years, and this number is improving.
A survey of Hoosiers found that 47%47% are Pacers fans, 54%54% are Colts fans, and 25%25% are Pacers fans but not Colts fans. What proportion of those surveyed are Colts fans but not Pacers fans?
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The Bureau of Labor Statistics reports that the official unemployment rate for Black people was 10.4% and 4.7% for White people in February 2015. Select all correct answers for this question. O The samples of white and black people are independent. The explanatory variable is the unemployment rate. The response variable is the unemployment rate. The response variable is race.
Kindly assist with creating bar charts, or pie charts for the below results; The results of this study were based on interviews issued and completed by eleven (11) employees at the Hotel. This research study comprised 31.4% of the total workforce across the three departments, with a total of 35 employees who varied in age from 16 years to above 65 years. 63.6% of individuals who participated were female, while 36% were male. The interviews included participation from 30% of employees in the housekeeping department, 33% from Guest Services, and 31% from the Food and Beverage department. There is a higher representation of females across all departments, with a total of 7 females compared to 4 males. There is a range of tenure lengths, with some employees having just started (1 year) and others having been with the hotel for longer periods (up to 14.5 years).
A business sent out a survey to it's customers in two groups; one under 30 years old (group 1) and one over 30 years old (group 2). Customers were asked if they preferred to purchase items online or in store. Out of 300 customers under 30 (group 1), 180 said that they purchased online. Out of 300 customers over 30 (group 2), 170 said that they purchased online. Is there a difference in the population proportion who purchased online? The business wanted to test the hypothesis Ho: P2 P1 O versus Ha: P2 - P₁ does not equal Ö. What is the p-value? Use JMP and round the p-value to two decimal places.
Question Z The recidivism rate for convicted sex offenders is 11%. A warden suspects that this percent is higher if the sex offender is also a drug addict. Of the 332 convicted sex offenders who were also drug addicts, 50 of them became repeat offenders. What can be concluded at the a = 0.01 level of significance? a. For this study, we should use [z-test for a population proportion b. The null and alternative hypotheses would be: Ho: pv = H₁: pv = (please enter a decimal) (Please enter a decimal) (please show your answer to 3 decimal places.) c. The test statistic z = d. The p-value = e. The p-value is va f. Based on this, we should [Select an answer the null hypothesis. g. Thus, the final conclusion is that ... (Please show your answer to 4 decimal places.) O The data suggest the population proportion is not significantly higher than 11% at a = 0.01, so there is statistically significant evidence to conclude that the population proportion of convicted sex offender drug addicts who…
Sample surveys on sensitive issues can give different results depending on how the question is asked. A University of Wisconsin study randomly divided 2400 respondents into three groups. All participants were asked if they had ever used cocaine. One group of 800 was interviewed by phone; 21% said they had used cocaine. Another 800 people were asked the question in a one-on-one personal interview; 25% said “Yes.” The remaining 800 were allowed to make an anonymous written response; 28% said “Yes.”101. Was this an experiment or an observational study? Justify your answer.2. Make a two-way table of responses about cocaine use by how the survey was administered.3. Are the differences between the three groups statistically significant? Give appropriate evidence to support your answer
3) Reynoldsburg surveys their high schoolers. They found 60% of students had cheated on a test and 80% of those who cheated felt guilt about it. What percent of all high schoolers in Reynoldsburg have both cheated and felt guilty about it?
You may need to use the appropriate technology to answer this question. During the first 13 weeks of the television season, the Saturday evening 8:00 p.m. to 9:00 p.m. audience proportions were recorded as ABC 31%, CBS 26%, NBC 27%, and independents 16%. A sample of 300 homes two weeks after a Saturday night schedule revision yielded the following viewing audience data: ABC 97 homes, CBS 68 homes, NBC 91 homes, and independents 44 homes. Test with a = 0.05 to determine whether the viewing audience proportions changed. State the null and alternative hypotheses. 0.31, PCBS = 0.26, PNBC = 0.27, PIND 0.27, PIND = 0.16. Ho: : The proportions are not pPABC Наi РАВС 3 0.31, РсвS 0.26, PNBC 0.16 0.27, 0.16 Но: РАВС 0.31, Рсвs 3D 0.26, Наi РАВС + 0.31, РсвS PNBC + 0.26, PNBC ± 0.27, , PIND + 0.16 Ho: PABC + 0.31, PCBS + 0.26, PNBC + 0.27, PIND + 0.16 0.26, PNBC 0.27, PIND = 0.16 %D На РАВС - 0.31, РсBs 0.26, PNBC 0.27, PIND 0.16 Нo: РАВС - 0.31, РсBS H: The proportions are not PABC 0.16. 0.31,…