PHRASE ANSWER Number in the sample A. Za, 11 Matches letter В. 13 Population mean Matches letter С. D. X or bar X 10 Sample mean Matches letter E. F. МАТСH 12 Z score for Matches letter alpha /2
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- Two popular brands of tires for tractor-trailers are the Puma and the Eternal. Christine is a buyer for a major shipping company and wants to determine if there is any difference between the two brands of tire in the mean distance (in thousands of km ) driven on them before they need to be replaced. In the company's testing lab, Christine tests a random sample of 13 Puma tires and a random sample of 15 Eternal tires. (These samples are chosen independently.) For the Puma tires, the sample mean distance (in thousands of km ) until they would need to be replaced is 62.12 with a sample variance of 11.55 . For the Eternal tires, the sample mean distance (in km ) until they would need to be replaced is 55.43 with a sample variance of 75.98 . Assume that the two populations of distances driven are approximately normally distributed. Can Christine conclude, at the 0.05 level of significance, that there is a difference between the population mean of the…A physician is interested to determine if the mean length of waiting time to conceive (in months) of married women in urban and rural areas is the same. She randomly selected 10 married women in each area matched according to age at marriage and party. The length of waiting time to conceive since data of marriage or date of last birth delivery was recorded. What type of sample was used? - independent - objective - related - subjectiveThe manager of Microsoft wants to study the # of hours per week employees spend at their desktop computers by type of industry. The manager randomly selected a sample of 5 executives from each of 3 industries studied. At the 0.05 siginificance level, can she conclude there is a difference in the mean number of hours spent per week by industry? Construction - 12, 10, 10, 12, 10 Energy - 8, 8, 6, 8, 10 Manufacturing - 10, 8, 6, 8, 10 What is the decision rule? (round 2 decimal places) (F 0.05 > ?) Complete the ANOVA Table: Source SS df MS F Treatments Error
- A fire insurance company thought that the mean distance from a home to the nearest fire department in a suburb of Chicago was at least 4.5 miles. It set its fire insurance rates accordingly. Members of the community set out to show that the mean distance was less than 4.5 miles. This, they thought, would convince the insurance company to lower its rates. They randomly indentified 52 homes and measured the distance to the nearest fire department from each. The resulting sample mean was 3.7. If ? = 2.1 miles, does the sample show sufficient evidence to support the community's claim at the ? = .05 level of significance? (a) Find z. (Give your answer correct to two decimal places.)(ii) Find the p-value. (Give your answer correct to four decimal places.)(b) State the appropriate conclusion. Reject the null hypothesis, there is not significant evidence that the mean distance is less than 4.5 miles.Reject the null hypothesis, there is significant evidence that the mean distance is less than…Suppose an instructor wants to know the average height, gender distribution, academic performance (bad, good, very good, excellent), and year of admission of the Students. He divided the students into male and female and took a random sample of 30 male and 30 female students.i) Identify the level of measurement of each identified variableii) Which sampling technique was used to select 60 students?Compute the mean, median, and mode of the data sample. (If every number of the set is a solution, enter EVERY in the answer box.) 3, 1, 7, −4, 0, 5 mean median mode
- Students from TarlacElementarySchool got scores of91, 91, 99, 94, 94, 92, 93, 92, 94, 95, 89, 92,99, 92, 93, 94, 91, 92, 93, 92, 91,94, and 95. Construct a frequency distribution table, find the mean, mode, range, variance, and standarddeviation.100 students was required to estimate the mean achievement in research of graduatestudents. The average graduate students in the city’s universities and colleges is 20students. Thus, 5 universities or colleges were randomly selected and all graduatestudents under graduate program with thesis were assessed. What sampling methodwas used?A landscaping company hypothesizes that the median number of lawns they mow in a weekend is 20. They tabulated the number of lawns mowed in a random sample of 14 weekends. State the test value. 22, 18,19, 20, 25, 20,18, 22, 23, 20, 21, 26, 24, 22
- A cardiologist is interested in the mean recovery time of her patients who have had heart attacks. Suppose the cardiologist has a total of 52 patients and among those, 30 patients have had heart attacks. The study records 10 patients' recovery times, what is the sample size? 10 None of the above 52 3A nationwide job recruiting firm wants to compare the annual incomes for childcare workers in Texas and Indiana. Due to recent trends in the childcare industry, the firm suspects that the mean annual income of childcare workers in Texas is less than the mean annual income of childcare workers in Indiana. To see if this is true, the firm selected a random sample of 20 childcare workers from Texas and an independent random sample of 20 childcare workers from Indiana and asked them to report their mean annual income. The data obtained were as follows. Annual income in dollars Texas 37093 , 33960 , 35692 , 29528 , 30978 , 35504 , 26961 , 28380 , 37537 , 25341 , 34837 , 36489 , 33633 , 41229 , 43577 , 27644 , 43364 , 28415 , 28919 , 34096 Indiana 33672 , 46452 , 35900 , 28486 , 46528 , 34252 , 40952 , 42164 , 36298 , 38828 , 32690 , 29157 , 42770 , 35527 , 40804 ,…John Calipari, head basketball coach for the 2012 national championuniversity of Kentucky Wildcats, is the highest paid coach in collegebasketball with an annual salary of $5.4 million (USA Today, March 29,2012). The sample attached shows the head basketball coach's salary for asample of 10 schools playing NCAA Division I basketball. Salary data arein millions of dollars. a. Use the sample mean for the 10 schools to estimate thepopulation mean annual salary for head basketball coaches atcolleges and universities playing NCAA Division I basketball.b. Use the data to estimate the population standard deviation for the annual salary for head basketball coaches.c. What is the 95% confidence interval for the population variance?d. What is the 95% confidence interval for the population standarddeviation?
