QBA EXAM 1
A summary measure that is computed to describe a characteristic from an entire population is called?
A parameter
The universe or "totality of items or things" under consideration to reach conclusions is called?
A population.
In a positively-skewed distribution:
the median is less than the mean
Which measure of central tendency is most vulnerable to outliers?
A mean
A population consists of:
All items of interest in a statistical problem
According to the empirical rule, if the data from a "bell-shaped" normal distribution what percent is within -1 and +1?
about 68
According to the empirical rule, if the data from a "bell-shaped" normal distribution what percent is within -2 and +2?
about 95
According to the empirical rule, if the data from a "bell-shaped" normal distribution what percent is within -3 and +3
about 99
T/F: The possible responses to the question "How many times in the past three months have you visited a city park?" are values from a discrete variable.
TRUE.
Which of the following statements about variance is most accurate? a. is the average of the squared deviations from the mean b. is the square root of the standard deviation c. can be a positive number or a negative number d. is denominated in the same units as the original data
A. is the average of the squared deviations from the mean
Which of the following is most likely a parameter as opposed to a statistic? a. the average score of students completing a test b. females registered to vote in a country c. average height of randomly selected people d. trucks cited for bad braked yesterday
B. The females registered to vote in a country
Which of the following is appropriate for displaying data collected on the different brands of cars students at a major university drive? a. bar chart b. pie chart c. histogram
Bar chart and pie chart
Which of the following is appropriate for displaying data collected on the salary of the current NBA players? a. bar chart b. pie chart c. histogram
A histogram????????????????
A summary measure that is computed to describe a characteristic from only a sample of the population is called?
A statistic.
Which of the following is a discrete quantitative(numerical) variable? a. number of employees of an insurance company b. volume of water released from a dam c. distance you drove yesterday d. Dow Jones Industrial average
A. the number of employees of an insurance company
Which of the following statements about the median is NOT true? a. divides the distribution into two halves b. it is a measure of central tendency c. it is equal to the mode in bell-shaped "normal" distribution d. it is more affected by extreme values than the mean
D. it is more affected by extreme values than the mean
Which of the following is a continuous quantitative(numerical) variable? a. the color of a students eyes b. number of employees of an insurance company c. number of gallons of milk sold in a store yesterday d. amount of milk in a carton(liter)
D. the amount of milk in a carton(liter)
Which scales of data measurement are associated with quantitative data?
Interval and ratio.
T/F: The possible response to the question "how long have you been living at your current residence?" are values from a continuous variable.
TRUE.
