MATH 302 QUIZ 1 – QUESTION AND ANSWERS – SET 1 ( LATEST UPDATE )

MATH 302 QUIZ 1 – QUESTION AND ANSWERS – SET 1 Question 1 of 20 1.0 / 1.0 Points An advertisement for a car states that it is 10% more powerful than its competitor. This is an example of • A. detached statistics • B. suspect samples • C. changing the subject • D. ambiguous averages Answer Key: A Question 2 of 20 0.0 / 1.0 Points A scatterplot allows one to see: • A. whether there is any relationship between two variables • B. what type of relationship there is between two variables • C. Both (a) and (b) are correct • D. Neither (a) nor (b) is correct Answer Key: C Question 3 of 20 1.0 / 1.0 Points Which of the following are the two most commonly used measures of variability? • A. Variance and standard deviation • B. Variance and median • C. Mean and variance • D. Range and interquartile range Answer Key: A Question 4 of 20 1.0 / 1.0 Points A histogram that has a single peak and looks approximately the same to the left and right of the peak is called: • A. balanced • B. bimodal • C. symmetric • D. proportional Answer Key: C Question 5 of 20 1.0 / 1.0 Points What kind of relationship between x and y is demonstrated by the scatter plot below? A. This is not a scatter plot B. A positive linear relationship C. A negative linear relationship D. No linear relationship Answer Key: C Question 6 of 20 1.0 / 1.0 Points Which of the following statements is true regarding the data set 10, 10, 10, 10, and 10? • A. The range is zero • B. The standard deviation equals zero • C. The interquartile range equals zero • D. all of the above Answer Key: D Question 7 of 20 1.0 / 1.0 Points Which of the following statements is true for the following data values: 7, 5, 6, 4, 7, 8, and 12? A. The mean, median and mode are all equal • B. Only the mean and mode are equal • C. Only the mean and median are equal • D. Only the median and mode are equal Answer Key: A Question 8 of 20 1.0 / 1.0 Points Researchers may gain insight into the characteristics of a population by examining a • A. description of the population B. mathematical model describing the population • C. sample of the population • D. replica Answer Key: C Question 9 of 20 1.0/ 1.0 Points Suppose that a histogram of a data set is approximately symmetric and "bell shaped". Approximately what percent of the observations are within two standard deviations of the mean? • A. 99.7% • B. 95% C. 68% • D. 50% Answer Key: B Question 10 of 20 1.0 / 1.0 Points What is the term for a characteristic or attribute that can assume different values? • A. datum • B. sample • C. exponent • D. variable Answer Key: D Question 11 of 20 1.0 / 1.0 Points Which measure of central location is meaningful when the data are categorical? • A. The mode • B. The mean • C. The range • D. The median Answer Key: A Question 12 of 20 1.0 / 1.0 Points Which of the following are the three most common measures of central location? • A. Mean, median, and standard deviation • B. Mean, median, and mode • C. Mean, median, and variance • D. Mean, variance, and standard deviation Answer Key: B Question 13 of 20 1.0/ 1.0 Points Click to see additional instructions The following data represent the number of children in a sample of 10 families from Chicago: 4, 2, 1, 1, 5, 3, 0, 1, 0, and 2. Compute the median number of children. Place your answer, rounded to two decimal places, in the blank. For example, 3.45 would be a legitimate entry. 1.50 Answer Key: 1.50 Question 14 of 20 1.0/ 1.0 Points Click to see additional instructions The following data represent the number of children in a sample of 10 families from Chicago: 4, 2, 1, 1, 5, 3, 0, 1, 0, and 2. Compute the variance of the data. Place your answer, rounded to two decimal places, in the blank. For example, 3.45 would be a legitimate entry. 2.77 Answer Key: 2.77 Question 15 of 20 1.0/ 1.0 Points Click to see additional instructions The following data are the base salaries, in thousands of dollars, of 50 chief executive officers for a sample of companies doing business with the state of Connecticut. That is, the first entry in the table below corresponds to a salary of $125,000. A copy of this data set can be found in the Excel Workbook called CEOS. 125 157 113 127 201 165 145 119 148 158 148 168 117 105 136 136 125 148 108 178 179 191 225 204 104 205 197 119 209 157 209 205 221 178 247 235 217 222 224 187 265 148 165 228 239 245 152 148 115 150 Find the median of the CEO salaries, in thousands of dollars, rounded to 2 decimal places. Do not use a dollar sign. Note: $177,760 should be recorded as 177.76. 165 CEOS Answer Key: 160.00|170.00 Question 16 of 20 0.0/ 1.0 Points Click to see additional instructions A sample of 150 students at a State University was taken after the final business statistics exam to ask them whether they went partying the weekend before the final or spent the weekend studying, and whether they did well or poorly on the final. The following table contains the result. Did Well on Exam Did Poorly on Exam Studying for Exam 60 15 Went Partying 22 53 If the sample is a good representation of the population, what percentage of those who did poorly on the final exam should we expect to have spent the weekend studying? Place your answer in the blank, rounded to 2 decimal places. Do not use a percentage sign (%). For example, 44.44 would be a legitmate answer. 77.94 Answer Key: 22.06 Question 17 of 20 1.0/ 1.0 Points Click to see additional instructions The histogram below represents scores achieved by 250 job applicants on a personality profile. Sixty percent of the job applicants scored below what value? Place your answer in the blank. Do not use any stray symbols. For example, 123 would be a legitimate answer. 40 Answer Key: 40 Question 18 of 20 1.0/ 1.0 Points Click to see additional instructions The following data are the base salaries, in thousands of dollars, of 50 chief executive officers for a sample of companies doing business with the state of Connecticut. That is, the first entry in the table below corresponds to a salary of $125,000. A copy of this data set can be found in the Excel Workbook called CEOS. 125 157 113 127 201 165 145 119 148 158 148 168 117 105 136 136 125 148 108 178 179 191 225 204 104 205 197 119 209 157 209 205 221 178 247 235 217 222 224 187 265 148 165 228 239 245 152 148 115 150 Find the mean of the CEO salaries, in thousands of dollars, rounded to 2 decimal places. Do not use a dollar sign. Note: $177,760 should be recorded as 177.76. 172.34 CEOS Answer Key: 171.25|173.50 Question 19 of 20 1.0/ 1.0 Points The number of car insurance policy holders is an example of a discrete random variable True False Answer Key: True Question 20 of 20 1.0/ 1.0 Points Individual observations within each category may be found in a frequency table. True False Answer Key: False