In a survey of 1000 adults, 34% found they prefer charcoal to gas grills. The 34% would be considered a:
In a survey of 1000 adults, 34% found they prefer charcoal to gas grills. The 34% would be considered a:
Statistic
Population
Parameter
Sample
Question 2The chances of winning the Maryland lottery are one chance in twenty-two million. The probability would be considered an example of:
Inferential statistics
Experiment design
Descriptive statistics
A sample
Question 3 The milligrams of tar in 30 cigarettes would be considered:
Ordinal data
Nominal data
Interval data
Ratio data
Question 4The ratings of 50 movies would be considered:
Ordinal data
Interval data
Ratio data
Quantitative data
Question 5A researcher randomly selects and interviews fifty male and fifty female teachers. This sampling technique is called:
Cluster
Random
Convenience
Stratified
Question 6Cameras are set up to watch an intersection and determine how many cars are let through with each green light interval. This study design would be considered:
Survey
Simulation
Experimental
Observational
Question 7Which of the following would be the mean of this data set: 5, 7, 12, 36, 14, 12, 33, 21
13.00
11.6
17.5
11.4
Question 8Which of the following would be the variance of this population data set: 3, 6, 8, 9, 4, 5, 7, 1, 9, 7, 5, 4, 3, 1
2.66
6.55
7.05
2.56
Question 9If a data set is right skewed, where would the mean be in relation to the mode?
Right skewed distributions don’t have a mean nor mode
At a higher value
At the same value
At a lower value
Question 10In a normally distributed data set with a mean of 24 and a standard deviation of 4.2, what percentage of the data would be between 19.8 and 28.2 and why?
68% based on the Empirical Rule
68% based on the histogram
95% based on the Empirical Rule
95% based on the histogram
Question 11Which data outcome of the speed of cars would best support installing a speed bump?
High mean with small standard deviation
Low mean with small standard deviation
High mean with high standard deviation
Low mean with high standard deviation
Question 12In manufacturing, stratified sampling could be used to determine if the machines are operating correctly. Which of the following best describes this type of sampling?
Every 10th product in the line is selected
Samples are randomly selected throughout the day
Products are put into groups and some are randomly selected from each group
Products are put into groups and all are included from several randomly selected groups
Question 13A graph shows the ten’s digit on the left and the one’s digits on the right. This graphic is most likely to be:
A frequency polygon
A dot plot
A frequency histogram
A stem-leaf plot
Question 14Match the terms and their definitions
Vertical bar chart that shows frequency on the y-axis
A sample where the population is divided into groups and several groups are randomly selected from all from those selected groups are sampled
Collection of all counts that are of interest
A subset or part of a population
A sample where the population is divided into groups and several are randomly sampled form each group
Consists of attributes, labels, or nonnumerical entries
Question 15Match the terms and their definitions
The most frequent number appearing in a dataset
The average
The percentage of data that falls within 1, 2, or 3 standard deviations of the mean in a symmetrical, bell-shaped distribution
The square root of the variance
Show how far a particular data point is from the mean in terms of the number of standard deviations
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