ST 311 NCSU Exam #1 Multiple Choice. Exam Questions and answers, 100% Accurate, VERIFIED.

ST 311 NCSU Exam #1 Multiple Choice. Exam Questions and answers, 100% Accurate, VERIFIED. A normal distribution is... - -symmetric In a simple random sample, the problem of non-response bias occurs when... - -Some individuals that are randomly selected refuse to participate A certain firm has 500 employees. An auditor wishes to estimate the average number of days of sick leave taken per employee over the past quarter. The firm has eight divisions, with varying numbers of employees per division. The auditor decides to randomly sample 3 divisions and finds the number of sick days each employee within these divisions take. This sample is best described as: - -A cluster sample using the divisions as clusters. Suppose a random sample of size n = 35 is taken from population A and a random sample of size n = 20 is taken from population B. In which case would it be valid to use the standard normal distribution to make probability calculations concerning these sample means? - -Both samples. A local corporation was interested in the purchasing habits of Wake County residents. One of the things they were interested in was the proportion of residents that did a major home improvement project in the last year. The corporation used a list of all households in the county to take a simple random sample. The researcher then visited each of the sampled homes and found that 21 of 100 homes had completed a major home improvement project. A.What is the population of interest in this situation? B. What is the parameter of interest in this situation? C. What is the sampling frame in this situation? - -A. All Wake County residents. B. The proportion of all Wake County residents who did a major home improvement. project in the last year. C. The list of all households in the county Adult Great Basin rattlesnakes have a mean length of 36 inches and a standard deviation of 5 inches; the length of adult Southern Pacific rattlesnakes is also 36 inches on average, but with a standard deviation of 7 inches. Suppose you take a random sample of 35 Great Basin rattlesnakes and a random sample of 100 Southern Pacific rattlesnakes. A. Which sample mean is more likely to be larger than 37 inches? B. You randomly select one Great Basin rattlesnake and one Southern Pacific rattlesnake. Which is more likely be longer than 37 inches? Assume it is known that the length of both subspecies obeys a normal distribution. - -A. The sample mean length of the 35 Great Basin rattlesnakes.