A First Course in Probability (10th Edition)
10th Edition
ISBN: 9780134753119
Author: Sheldon Ross
Publisher: PEARSON
expand_more
expand_more
format_list_bulleted
Question
According to the us census bureau, the number of peopel in a household has
Expert Solution
This question has been solved!
Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.
Step by stepSolved in 4 steps with 1 images
Knowledge Booster
Similar questions
- Lydia Hayward is an external research consultant hired by FirstCard, a major credit card company, to find evidence that the population mean total credit card balance for adults ages 25 to 34 with a college degree in the region is greater than for adults ages 25 to 34 without a college degree. Due to research already conducted by FirstCard, Lydia assumes that the population standard deviation is $2,047.24 for adults ages 25 to 34 with a college degree and $1,749.65 for those without a college degree. She conducts a survey at a local shopping center and selects every tenth adult ages 25 to 34 with a college degree and every tenth adult ages 25 to 34 without a college degree to ask for the total credit card balance. The results of the samples are shown in the table below. Explain whether a hypothesis test for the difference between two means of independent samples is appropriate, and if so, determine the null and alternative hypotheses for this hypothesis test. Let μ1be the population…arrow_forwardAccording to the us census bureau the number of people in a household has mean of 2.6 and a standard deviation of 1.5. Suppose the census Bureau instead had estimated this mean using a random sample of 25 homes and that sample had a mean of 2.4 and standard deviation of 1.4. describe the center and spread of the sample distribution of the sample means for 225 homes. What does that distribution describe?arrow_forwardImagine that every elementary school in California is measured on several characteristics and then given an overall Quality Score. In Los Angeles Unified School District, the schools have an average (mean) quality score of 101.8 with a standard deviation of 7.2. One school in Los Angeles, Carver Elementary, gets a quality score of 104.5. In San Francisco Unified School District, the schools have an average (mean) quality score of 102.3 with a standard deviation of 9.4. One school in San Francisco, Bryant Elementary, gets a quality score of 99.5. Find the Z-scores for both of these two schools (Carver Elementary in Los Angeles, and Bryant Elementary in San Francisco)arrow_forward
- The Virginia Cooperative Extension reports that the mean weight of yearling Angus steers is 1152 pounds and the standard deviation is 84 pounds. In order to validate this claim, an investigative organization took a random sample of 30 yearlings and measured their weight. The data are displayed in the histogram What is the shape of this distribution? Visually estimate the center of this Visually estimate the number of yearlings in this sample that weigh less than 1100 Do you agree with the Virginia Cooperative Extension’s assertion that the mean weight of steers is 1152 pounds? Explain your response.arrow_forwardIn a certain country the heights of adult men are normally distributed with a mean of 68.8 inches and a standard deviation of 2.4 inches. The country's military requires that men have heights between 65 inches and 77 inches. Determine what percentage of this country's men are eligible for the military based on height.arrow_forwardA manufacturer of bolts has a quality-control policy that requires it to destroy any bolts that are more than 2 standard deviations from the mean. The quality-control engineer knows that the bolts coming off the assembly line have mean length of 10 cm with a standard deviation of 0.05 cm. For what lengths will a bolt be destroyed?arrow_forward
- A manufacturer of bolts has a quality control policy that requires it to destroy any bolts that are more than 2 standard deviations from the mean. The quality control engineer knows that the bolts coming off the assembly line have mean length of 12 cm with a standard devation of 0.10cm. For what lengths will a bolt be destroyed?arrow_forwardA company produces ceramic floor tiles that are supposed to have a surface area of 16 square inches. Due to variability in the manufacturing process, the actual surface area has a normal distribution with a mean of 16.1 square inches and a standard deviation of 0.2 square inches. The proportion of tiles produced by the process with a surface area less then 16 square inches is?arrow_forwardA study was being done at our District to see who takes more units per semester, students at Cypress College or students at number of units they took per semester was 13.1 units with a standard deviation of 2.4 units. They randomly selected a sample of 65 Cypress College students and found that the mean number of units they took per semester was 11.6 units with a standard Fullerton College. To test this, the researchers randomly selected 60 Fullerton College students and found that the mean deviation of 3.7 units. Test the claim that the mean number of units is more for Fullerton College students than Cypress College students at the a=0.05 level of significance. Calculator Function [ Select ] [ Select ] X^2-Test T-Test 2-SampFTest 2-PropZTest ANOVA 2-SampT Test [ Select ] sufficient evidence that the mean number of units is (Select] for Fullerton College students than Cypress College students.arrow_forward
- Suppose that the quarterly sales levels among health care information systems companies are approximately normally distributed with a mean of 12 million dollars and a standard deviation of 1.3 million dollars. One health care information systems company considers a quarter a "failure" if its sales level that quarter is in the bottom 20% of all quarterly sales levels. Determine the sales level (in millions of dollars) that is the cutoff between quarters that are considered "failures" by that company and quarters that are not. Carry your intermediate computations to at least four decimal places. Round your answer to one decimal place. million dollars X Sarrow_forwardA phormaceubcal testing company wants to test a new cholesterol drug. The mean cholesterol level of the target population is 245 mg and a standard deviation of 35 mg. The company wishes to test people who have a cholesterol level that is at least 1.5 standard deviations above the mean. What is the minimum cholesterol level needed in order for a person to be included in the study?arrow_forwardA survey found that women's heights are normally distributed with mean 62.3 inches and standard deviation 2.2 inches. Most of the live characters employed at an amusement park have height requirements of at least 54 inches Find the percentage of women meeting the height requirement?arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
- A First Course in Probability (10th Edition)ProbabilityISBN:9780134753119Author:Sheldon RossPublisher:PEARSON
A First Course in Probability (10th Edition)
Probability
ISBN:9780134753119
Author:Sheldon Ross
Publisher:PEARSON