Exam 1 - Practice Exam (Chapter 1,2,3)

Transcription

1 Exam 1 - Practice Exam (Chapter 1,2,3) (Test Bank Odds Ch 1-3) TRUE/FALSE. Write 'T' if the statement is true and 'F' if the statement is false. 1) Statistics is a discipline that involves tools and techniques used to describe data and draw conclusions. 1) 2) A store manager tracks the number of customer complaints each week. The following data reflect a random sample of ten weeks. 2) The standard deviation for these data is approximately ) A recent study involving a sample of 3,000 vehicles in California showed the following statistics related to the number of miles driven per day: Q1 = 12, Q2 = 45, and Q3 = 56. Based on these data, if a box and whisker plot is developed, a value of 110 is an outlier. 3) 4) The owner of a local gasoline station has kept track of the number of gallons of regular unleaded sold at his station every day since he purchased the station. This morning, he computed the mean number of gallons. This value would be considered a statistic. 4) 5) The difference between bar charts and histograms is that bar charts always show percentage while histograms always show frequency. 5) 6) Descriptive statistics allow a decision maker to reach a conclusion about a population based on a subset from the population. 6) MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 7) An Internet service provider has the capability of tracking the time that each of its customers spends connected to the Internet during a month. These data would constitute: A) a simple random sample. B) a convenience sample. C) a population. D) a cluster sample. 7) 8) A value computed from a population is called: 8) A) a point estimate. B) a real number. C) a parameter. D) a statistic. 9) The human resources department at a major high tech company recently conducted an employee satisfaction survey of 100 of its 3,000 employees. Data were collected on such variables as age, gender, marital status, current salary, level of overall satisfaction on a scale from 1 to 5, number of years with the company, and job title. Considering the age variable where employees were asked to list their age at their last birthday, which of the following best describes the level of data measurement for that variable? A) Ratio level B) Cross-sectional data C) Interval level D) Nominal level 10) A college data base includes the number of people who are enrolled in each class the college offers. This is an example of: A) ratio data. B) interval data. C) nominal data. D) ordinal data. 9) 10) 1

2 11) Consider the following chart. Which of the following statements is most correct? 11) A) The values for the dependent variable are determined by the values for the independent variable. B) The variable on the horizontal axis should be the independent variable. C) A scatter plot like this one shows the trend in the data over time. D) The values in a scatter plot should be connected by a straight line. 12) At a manufacturing plant workers are divided into 4 different teams that rotate shifts. The number of units produced by each team is recorded. The best type of chart to display the data is a: A) ogive. B) line chart. C) pie chart. D) histogram. 13) The Maple Grove Hotel manager has collected data on the number of rooms occupied each evening for the past 700 nights. The fewest rooms occupied during that period was 11 and the most was the capacity, 430. Based on this information, which of the following would be reasonable class limits for the first class if the manager wishes to use 8 classes to develop a frequency distribution? A) 0 to B) 10 to < 65 C) 0 to 40 D) 11 to 19 14) Which of the following is an acceptable format for setting up class boundaries for a frequency distribution? A) 200 to B) 20 to 40 C) 20 to under 40 D) All of the above. 15) A study was recently done in which the brand preference for breakfast cereal was analyzed against the gender of the shopper. The study consisted of 200 male shoppers and 300 female shoppers. Three different cereal brands were considered: A, B, and C. A total of 250 female shoppers preferred brand A, 25 female shoppers preferred brand C. A total of 100 shoppers preferred brand B. The number of male shoppers that preferred brand B was: A) 75. B) 100. C) 50. D) ) 13) 14) 15) 2 - DS 23 Ferbrache (08/30/2017)

3 16) Frequency distributions can be formed from which of the following types of data? 16) A) Continuous only B) Both discrete and continuous C) Discrete only D) Only qualitative data 17) Many Walmart stores have automotive departments where customers can buy tires, have their vehicles serviced, and obtain other automotive services. Recently, the manager at an Ohio Walmart collected data on the time customers had to wait to get the desired automotive service. Of the 500 cars in the sample, the shortest time any customer spent waiting was 3 minutes and the longest time was 183 minutes. Assuming that the manager wishes to develop a frequency distribution with 9 classes, which of the following would be an appropriate class width for each class? A) B) C) D) 3 to 23 18) Consider the following sample data: 17) 18) For these data the sample mean is: A) 8 B) 10 C) 12 D) 3 19) If a data set has 1,133 sorted values, what value corresponds to the 3rd quartile? 19) A) The 850th value B) The 250th value C) The 760th value D) The 849th value 20) Which of the following is the most frequently used measure of variation? 20) A) The standard deviation B) The mode C) The range D) The variance 21) In order to compute the mean and standard deviation, the level of data measurement should be: 21) A) ordinal. B) ratio or interval. C) nominal. D) qualitative. 22) The asking price for homes on the real estate market in Baltimore has a mean value of $286,455 and a standard deviation of $11,200. The mean and standard deviation in asking price for homes in Denver are $188,468 and $8,230, respectively. Recently, one home sold in each city where the asking price for each home was $193,000. Assuming that both distributions are bell-shaped, which of the following statements is true? A) The Denver home has a higher standard z-value. B) The coefficient of variation for Denver is less than for Baltimore. C) Both cities have the same coefficient of variation. D) The Baltimore home has the higher standard z-value. 23) Data was collected on the number of television sets in a household, and it was found that the mean was 3.5 and the standard deviation was ) 23) Based on these sample data, what is the standardized value corresponding to 5 televisions? A) B) C) 2.00 D) ) When comparing data measured by substantially different scales, we must use: 24) A) standardized data variations. B) standardized data scores. C) standardized data values. D) standardized data scales. 3 - DS 23 Ferbrache (08/30/2017)

4 25) A professor wishes to develop a numerical method for giving grades. He intends to base the grade on homework, two midterms, a project, and a final examination. He wishes the final exam to have the largest influence on the grade. He wants the project to have 10%, each midterm to have 20%, and the homework to have 10% of the influence of the semester grade. 25) Determine the weights the professor should use to produce a weighted average for grading purposes. A) Weight B) C) D) Weight Weight Weight ) Todd Lindsey & Associates, a commercial real estate company located in Boston, owns six office buildings in the Boston area that it leases to businesses. The lease price per square foot differs by building due to location and building amenities. Currently, all six buildings are fully leased at the prices shown here. 26) Price per Square Foot Number of Square Feet Building 1 $75 125,000 Building 2 $85 37,500 Building 3 $90 77,500 Building 4 $45 35,000 Building 5 $55 60,000 Building 6 $ ,000 Compute the weighted average (mean) price per square foot for these buildings. A) B) C) D) DS 23 Ferbrache (08/30/2017)

5 Answer Key Testname: EXAM1 1) TRUE 2) FALSE 3) FALSE 4) FALSE 5) FALSE 6) FALSE 7) C 8) C 9) A 10) A 11) B 12) C 13) B 14) D 15) A 16) B 17) A 18) B 19) A 20) A 21) B 22) A 23) C 24) C 25) C 26) B 5 - DS 23 Ferbrache (08/30/2017)