MATH 534 Week 1 Quiz

1. Question: Classify each of the following as nominal, ordinal, interval, or ratio data. 2. Question: The activity or the process of collecting the data on the population is called . 3. Question: A company wants to learn the customers’ purchase habits of buying certain products. This company did a survey about a random 1000 customers, who were asked about the times they purchased the certain products within one month. Then what is the data in this example: 4. Question: Researchers often wish to know the color preference of consumers and might ask consumers to specify their favorite color, such as red, blue, yellow or purple. This is an example of what level of data? 5. Question: What is the level of data corresponding to a military rank (Lieutenant, Captain, Major)? 6. Question: Chemists need to measure the temperature when performing chemistry experiments. What is the level of the data of the heat measured in degrees centigrade? 7. Question: For the following frequency distribution, what is the cumulative frequency for the class “30-under 40”? 8. Question: For the following data, construct a frequency distribution with six classes. 9. Question: Cumulative frequency for an individual class is the . 10. Question: A consumer group surveyed food prices at 87 stores on the East Coast. Among the food prices being measured was that of sugar. From the data collected, the group constructed the frequency distribution of the prices of 4 pounds of Domino’s sugar in the stores surveyed. Compute a histogram, a frequency polygon, and an ogive for the following data. 11. Question: Assuming that the dataset 22, 5, -7, 11, 2, 11 is a sample, what is the sample standard deviation? 12. Question: For a set of data that are distributed in a bell or mound shape, approximately what percentage of values will lie between the mean and two standard deviations? 13. Question: If the z-score of an observation in a set of normally distributed numerical data is bigger than zero, it means that the observation is . 14. Question: Scores obtained by students in an advanced placement test has a symmetric mound shaped (bell shaped) distribution with a mean of 70 and a standard deviation of 10. What is the proportion of students who received between 60 and 80 points. 15. Question: What is the range for the following five numbers? 223, 264, 216, 218, 229 16. Question: A population is normally distributed with a mean of 25 and a standard deviation of 3. What is the z score for 18? 17. Question: According to a Human Resources report, a worker in the industrial countries spends on average 419 minutes a day on the job. Suppose the standard deviation of time spent on the job is 27 minutes?