5. With complete solutions please. 5. Each year, Mary & Belo, Ltd., sets up a gift- wrapping station to assist its customers withholiday shopping. Preliminary observations of one worker at the station produced thefollowing sample time (in minutes per package): 3.5, 3.2, 4.1, 3.6, 3.9. Based on this smallsample, what number of observations would be necessary to determine the true cycle timewith a 95% confidence level and an accuracy of 5%?

Sample Size is given by the formula n = (z*s/h*x)^2 Where z = confidence level s = standard…

Answered: 5. Each year, Mary & Belo, Ltd., sets…

Advanced Engineering Mathematics

10th Edition

ISBN:9780470458365

Author:Erwin Kreyszig

Publisher:Erwin Kreyszig

Chapter2: Second-order Linear Odes

Section: Chapter Questions

Problem 1RQ

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Suppose the price per share of stock for a sample of 25 companies was recorded at the beginning of the first financial quarter and then again at the end of the first financial quarter. How stocks perform during the first financial quarter is an indicator of what is ahead for the stock market and the economy. Company End of 1st quarter Beginning of 1st quarter Company 1 54.69 55.32 Company 2 56.20 78.52 Company 3 103.07 110.50 Company 4 80.45 85.08 Company 5 126.51 140.73 Company 6 133.23 137.28 Company 7 32.56 42.57 Company 8 51.41 54.54 Company 9 35.90 37.94 Company 10 14.55 19.48 Company 11 33.04 40.04 Company 12 45.33 40.36 Company 13 185.13 189.53 Company 14 109.28 109.45 Company 15 72.46 92.15 Company 16 49.32 55.03 Company 17 36.70 43.73 Company 18 79.57 86.18 Company 19 95.50 87.45 Company 20 43.09 47.09 Company 21 51.32 66.70 Company 22 77.45 86.53 Company 23 46.77 45.99 Company 24 46.45 48.13 Company 25 130.36 129.08 (a)…
1)In a cross-tabulation or contingency table examining the relationship between breed of dog and whether the dog passed certification to become a service animal, it is found that, overrall, 62 percent of the dogs were certified. The data looked at this for 6 breeds of dogs. If breed and being certified are independent of each other, about what percentage of each breed would pass the test? 2)Which of the following features must be present in a research design if the researchers want their data to demonstrate a causal relationship? The cause must take place before the effect. To the extent possible, another variable that explains the relationship needs to be ruled out or accounted for. The two variables need to covary. These three features must all be present. O A and B A correlation coefficient r provides two pieces of information about a relationship between two variables. These are Strength; direction of relationship Direction, proportions
In a Denver community, 50 cases of diabetes were reported among 15-19 years old out of a total population of 46,000 between September 1 to December 31, 2016. Ten percent (4,600) of the population were between 15-19 years old on April 1, 2016 and the size and age distribution of the population has remained constant. An investigation of the cases in the 15-19-year age group revealed that 22 of the reported cases were contracted prior to September 1. In addition, another 18 cases developed in April and May but were clinically resolved before September 1. What was the cumulative incidence rate of disease in 15-19 year olds per 1,000 population in this Denver community during the period September 1 to December 31, 2016?
A mining company finds that daily lost-work injuries averages to 1.2. If the local union contract has a clause requiring that the mine be shut down as soon as three workers incur lost-work injuries, on what percentage of the days will the mine be operational throughout the day?
A Bloomberg Businessweek North American subscriber study collected data from asample of 2861 subscribers. Fifty-nine percent of the respondents indicated an annualincome of $75,000 or more, and 50% reported having an American Express credit card.a. What is the population of interest in this study?b. Is annual income a categorical or quantitative variable?c. Is ownership of an American Express card a categorical or quantitative variable?d. Does this study involve cross-sectional or time series data?e. Describe any statistical inferences Bloomberg Businessweek might make on the basisof the survey
The following diagram shows a boxplot for the lifetimes (in months) of a sample of 30 light- bulbs.

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