Applied Business Statistics - Series Of Exams

Dr Barbara Sirotnik - Series Of Exams : 1) Classify all the following facts as nominal, ordinal, interval, or ratio facts.or. The time required to supply every tire at the meeting line a. The variety of liters of milk, an own circle of relatives liquids in a month b. Evaluate the 4 machines for your manufacturing facility in keeping with the rankings of "excellent", "good", "fair" and "poor" c. Customers in the United States with the area code d. Age of every of your employees e. Dollar income on the neighborhood pizzeria in line with month f. Employee identity code h. Response time of the emergency name unit 2) True or False: The highest level of data measurement occurs at the reporting level. 3) True or False: Interval and ratio level data are also called categorical data. 4) A small portion or subset of the population about which data is collected for statistical analysis is called. 5) One of the advantages of taking a sample instead of a census is: The sample is more accurate than the census destructive 6) Choosing the winning numbers is an example of a lottery. Convenience sampling, random sampling, non-random snowball sampling 7) A type of random sampling in which the population is divided into homogeneous, non-overlapping subpopulations is called. stratified random sampling, systematic sampling, snowball random sampling Systematic random sampling Snowball sampling 8) A type of random sampling in which every nth element (where k is a number) of the population is selected to be included in the sample is called. Stratified random sample cluster sample systematic sample regulatory sample 9) An example is the assessment sample. Convenience sampling Random sampling Non-random (non-probability) Fairness of the sample Departmental selection 11) What type of chart would be best for the above frequency distribution? Pie Chart, Bar Chart, Pareto Chart, Histogram 12) For the frequency distribution below, determine the relative frequency, percent frequency, and cumulative frequency. Class interval frequency 20 - less than 25 years 17 25 - less than 30 years 20 30 - less than 35 years 16 35 - less than 40 years 15 40 - less than 45 years 8 45 - less than 50 years 6, Total 82, 13 ) True or False: A frequency distribution is a summary of data presented in the form of frequency classes and intervals. 14) True or False: The range of a data set is defined as the difference between the mean and the median 15) True or False: The sum of the relative frequencies of a grouped data set is always equal to one. 16) The US Department of the Interior publishes mineral production data. Here are the values ??(in billions of dollars) of the 15 states in the United States that produce the most non-fuel minerals in 2008.1,68, 1,81, 1,85, 1,89, 2.05, 2,05, 2,08, 2,74, 3,21, 3.30, 4,00, 4,17, 4,20, 6,48, 7.84, calculate mean, median and mode. Calculate the range, interquartile range, pattern variance, and pattern popular deviation. Calculate the skewness coefficient of this data and interpret it 18) Polk reported that the average age of a car on US. roads last year was 7.5 years. Let's assume that the age distribution of cars is U-shaped. The streets in the south are bell-shaped. Let's further assume that the standard deviation is 1.7 years and the mean is 7.5 years. Between which two values ??does 95% of the vehicle age lie? 19) A large manufacturing company is testing new graduates. The test results are bell-shaped with a) mean of 500 and a standard deviation of 50. What percentage of people achieve scores between 400 and 600? b) What percentage of people scored above 450? c) Management considers placing a new employee in a management position if the person is in the top 0.15% of the distribution. What is the lowest score a graduate can achieve to qualify for this position? 20) According to the Bureau of Labor Statistics, the average annual salary for a worker in Detroit, Michigan is $35,748. Assume that the average annual salary of an employee in this group is $31,369 and his working hours are $29,500. a) Is the wage distribution in this group asymmetrical? If yes, how and why? b) What measure of central tendency would you use to describe this data? For what? 21) True or false: The median is the most common value in a data set. 22) True or False: The disadvantage of using the mean as a measure of central tendency is that it is influenced by extremely large or extremely small values in the data set. 23) True or false: The variance is the average of the squares of the deviations from the arithmetic mean of a set of numbers.24) What is the median of 5 consecutive numbers? 223, 264, 216, 218,229 25) The second quartile of a data set is always equal to its . 25) The sum of the deviations from the mean for the data set is equal. 26) Students' scores on the Advanced Placement test have a symmetrical bell-shaped distribution with a mean of 70 and a standard deviation of 10.What percent of college students scored among 60 and 80? 28) What percentage of students scored less than 50 points in the previous assignment? 29) The following cumulative probability table shows an age and gender distribution of physicians in the United States over the past year, as reported by the American Medical Association. a) What is the probability that a randomly selected doctor is between 35 and 44 years old? b) What is the probability that a randomly selected doctor is a woman between the ages of 45 and 54? c) What is the probability that a randomly selected doctor is male or between 35 and 44 years old? d) What is the probability that a randomly selected doctor is under 35 years old or between 55 and 64 years old? e) What is the probability that a randomly selected doctor is female if she is between 45 and 54 years old? f) What is the probability that a randomly selected doctor is neither female nor between 55 and 64 years old? 30) In a purchasing survey, purchasing professionals were asked which sales characteristics impressed them most in a sales representative. 78% chose "precision". Forty percent answered, "Know your product." Procurement professionals can list several characteristics. Assume that 27% of procurement professionals mention both "accuracy" and "accuracy"; and "Knowledge of their product" were the selling attributes that impressed them the most. The buyer will be randomly selected. a) Create a probability table with the above information. b) What is the probability that the expert chose "precision"? or "Do you know your product"? c) What is the probability that the expert has chosen not to be "accurate"? d) If we know that an expert has chosen "accuracy", what is the probability that the expert has chosen "knowledge of his product"? e) What is the probability that the expert did not choose "precision"? and you selected the "Do you know your product" option? 31) Based on previous midterm elections: The following table presents data from a sample of 200 people on their opinion of Congress's latest plan to eliminate antitrust exemptions for professional baseball (disaggregated by gender). 32) True or False: When two events are independent, the joint probability of the two events is always equal to the product of the marginal probabilities of the two events. 33) True or False: If the conditional probability of event A given another event B is equal to the marginal probability of event A, events A and B are mutually exclusive. 34) If the survival or non-survival of one event has no influence on the survival or nonsurvival of another event, the other two events are 35) List of all primary effects (meaning whatVolume. (Results that cannot be broken down to other events) of an experiment (i.e. a decision situation under conditions of uncertainty) are called . 36) How many different combinations of a 3-person debate team can be formed from a group of 16 qualified students?