MATH 302 QUIZ 1 – QUESTION AND ANSWERS – SET 4 ( LATEST UPDATE )

MATH 302 QUIZ 1 – QUESTION AND ANSWERS – SET 4 Part 1 of 3 - 7.0/ 12.0 Points Question 1 of 20 1.0/ 1.0 Points What type of sampling is being employed if the population is divided into economic classes and a sample is chosen from each economic class to be surveyed? A. random sampling B. cluster sampling C. stratified sampling D. systematic sampling Answer Key: C Question 2 of 20 0.0/ 1.0 Points Which of the following statistics is not a measure of central location? A. Median B. Mode C. Interquartile range D. Mean Answer Key: C Question 3 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 4 of 20 1.0/ 1.0 Points The total frequency of the data whose ogive is shown below is approximately A.1 8 B.9 0 C.1 2 D.3 4 Answer Key: D Question 5 of 20 1.0/ 1.0 Points The difference between the first and third quartile is called the A.mid range B. interdependent range C. unimodal range D. interquartile range Answer Key: D Question 6 of 20 1.0/ 1.0 Points A histogram that is positively skewed is also called A.balanced B. skewed to the left C. skewed to the right D. symmetric Answer Key: C Question 7 of 20 1.0/ 1.0 Points A time series plot is essentially a: A. figure B. diagram C. histogra m D. Scatterp lot Answer Key: D Question 8 of 20 1.0/ 1.0 Points If a value represents the 95th percentile, this means that A.there is a 5% chance that this value is incorrect B. 5% of the time you will observe this value C. 5% of all values are below this value D. 5% of all values are above this value Answer Key: C Question 9 of 20 0.0/ 1.0 Points For a boxplot, the box itself represents what percent of the observations? A. middle 50% B. lower 25% C. 0% D. upper 75% Answer Key: A Question 10 of 20 0.0/ 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 three standard deviations of the mean? A. 0% B. 8% C. 5% D.99.7 % Answer Key: D Question 11 of 20 0.0/ 1.0 Points If a variable has possible values –2, 6, and 17, then this variable is A.a continuous variable B.a discrete variable C.both a continuous and a discrete variable D.neither a continuous nor a discrete variable Answer Key: B Question 12 of 20 1.0/ 1.0 Points Given the following boxplot where m is the median value, what statement could be made about the distribution of the data? A. The distribution is negatively skewed. B. No statement can be made about the data because no data values are shown on the plot. C. The distribution is positively skewed. D. The distribution is approximately symmetric. Answer Key: D Part 2 of 3 - 3.0/ 6.0 Points Question 13 of 20 0.0/ 1.0 Points Accepted characters: numbers, decimal point markers (period or comma), sign indicators (-), spaces (e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation). NOTE: For scientific notation, a period MUST be used as the decimal point marker. Complex numbers should be in the form (a + bi) where "a" and "b" need to have explicitly stated values. For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not. 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 standard deviation of the data. Place your answer, rounded to two decimal places, in the blank. For example, 3.45 would be a legitimate entry. 1.58 Answer Key: 1.66 Question 14 of 20 0.0/ 1.0 Points Accepted characters: numbers, decimal point markers (period or comma), sign indicators (-), spaces (e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation). NOTE: For scientific notation, a period MUST be used as the decimal point marker. Complex numbers should be in the form (a + bi) where "a" and "b" need to have explicitly stated values. For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not. 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. 2.49 Answer Key: 2.77 Question 15 of 20 1.0/ 1.0 Points Accepted characters: numbers, decimal point markers (period or comma), sign indicators (-), spaces (e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation). NOTE: For scientific notation, a period MUST be used as the decimal point marker. Complex numbers should be in the form (a + bi) where "a" and "b" need to have explicitly stated values. For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not. 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 standard deviation 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. 43.94 CEOS Answer Key: 42.00| 45.00 Question 16 of 20 1.0/ 1.0 Points Accepted characters: numbers, decimal point markers (period or comma), sign indicators (-), spaces (e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation). NOTE: For scientific notation, a period MUST be used as the decimal point marker. Complex numbers should be in the form (a + bi) where "a" and "b" need to have explicitly stated values. For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not. Suppose that an analysis of a set of test scores reveals that: . Compute the interquartile range. Place your answer, rounded to 1 decimal place, in the blank. For example, 32.1 would be a legitimate entry. 60.0 Answer Key: 60.0 Question 17 of 20 0.0/ 1.0 Points Accepted characters: numbers, decimal point markers (period or comma), sign indicators (-), spaces (e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation). NOTE: For scientific notation, a period MUST be used as the decimal point marker. Complex numbers should be in the form (a + bi) where "a" and "b" need to have explicitly stated values. For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not. The histogram below represents scores achieved by 250 job applicants on a personality profile. Seventy percent of the job applicants scored above what value? Place your answer in the blank. Do not use any stray symbols. For example, 123 would be a legitimate answer. 50 Answer Key: 20 Question 18 of 20 1.0/ 1.0 Points Accepted characters: numbers, decimal point markers (period or comma), sign indicators (-), spaces (e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation). NOTE: For scientific notation, a period MUST be used as the decimal point marker. Complex numbers should be in the form (a + bi) where "a" and "b" need to have explicitly stated values. For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not. A statistics professor has just given a final examination in his statistical inference course. He is particularly interested in learning how his class of 40 students performed on this exam. The scores are shown below. 83 84 81 73 75 What is the median score on this exam? Place your answer, rounded to two decimal places in the blank. For example, 65.78 would be a legitimate entry. 79.5 Answer Key: 79.50 Part 3 of 3 - 0.0/ 2.0 Points Question 19 of 20 0.0/ 1.0 Points A histogram is skewed to the right (or positively skewed) if it has a single peak and the values of the distribution extend much further to the left of the peak than to the right of the peak. True Fals e Answer Key: False Question 20 of 20 0.0/ 1.0 Points If two data sets have the same range, the smallest and largest observations in both sets should be the same True Fals e Answer Key: False