MATH 302 QUIZ 1 – QUESTION AND ANSWERS – SET 4

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 calle