Quiz #1 ISDS 361A (Ch.1-4)
The number of sick days due to cold and flu last year was recorded by a sample of six adults. 8 5 3 7 9 2 The 30th percentile (P30) is:
a. 3.2
Which of the following statements is true regarding the data set 8, 8, 8, 8, and 8?
a. The range equals 0 b. The coefficient of variation equals 0, c. The standard deviation equals 0 *d. All of these choices are true
In a positively skewed distribution
a. the median is less than the mean
Which of these measures of central location is not sensitive to extreme values?
b. The Median
Which of the following statements is true for the following observations: 9, 8, 7, 9, 6, 11, and 13?
b. The mean, median and mode are all equal
Compare the two histograms below. Which statement is true? Look in Drop Box
b. The spread of histogram A is the same as the spread of histogram B
A researcher at Florida International University (FIU) wants to estimate the average number of credits earned by students last semester at FIU. She randomly selects 750 students from last semester and finds that they averaged 13.75 credits per student. The population of interest to the researcher is:
b. all FIU students enrolled last semester
Suppose you measure the number of minutes it takes an employee to complete a task, where the maximum allowed time is 5 minutes, and each time is rounded to the nearest minute. Data from 130 employees is summarized below. How long did it take most employees to complete the task? Time ] 1 2 3 4 5 Frequency ] 25 40 50 35 30
c. 3 minutes
A random sample of 100 students is taken at LearnAll University and it's found that their average GPA is 3.1. If this information is used to help estimate the average GPA for all students at LearnAll University, which branch of statistics was applied?
c. Inferential statistics
A company has developed a new power cell and wants to estimate its average lifetime. A random sample of 650 power cells is tested and the average lifetime of this sample is found to be 315 hours. The 315 hours is the value of a:
d. statistic
