unit 1 review questions Flashcards
Wealth disparity: Which line represents the median
B
Mean, median and mode
The data must be… Interval level, ratio level or either
Either
The labeling of the chart consistent with the chart’s graphing?
False
Count suggests discrete data s it should be a bar or pie chart not a line chart
The dataset to the left is bi-modal?
True
Two highest points on the graph - 2 modes
What is the range for the displayed dataset?
Largest - smallest = 22-6 = 16 (unit not frequency)
What is counted by measure - left column
What value should be used to describe the dispersion within the data set
2.79 which is the sample standard deviation
Two tables of the same data are inconsistent regarding..
N vs. frequency total
Answers ranged from 1-7. The table on the left treats data as _ and the right treats data as a _
Interval - calculating sd, mean (interval ratio calculations)
Ordinal - ranked order
Which would slightly improve the graph?
Include 1 on x-axis
What is wrong with the graph. 1-7
No x or y labels
“Number of” in the title
1-7 scale doesn’t need number of
B and C
The table accurately captures and displays the responses. Chart is what is your gpa and from 1-7 is attending sdsu a big deal
No. False
Took two questions and combined it into one table
What measure of central tendency is always determine without using a formula
mode
Which of the above measures is not affected by outliers
mode and median
Responses for qualitative data are _ and responses for quantitative data are _
descriptive/categorical
Numerical
Qualitative data is tallied by _ and quantitative data is tallied by _
Counting
Measuring or counting
Dynamic, statistical analysis can be performed on _?
Quantitative data
Which of the following distributions variable of interest is number of trials before first success
geometric
Will we never calculate a cumulative probability that is x or more OR more than x
Geometric
When you get your first success you’re done
The binomial distribution has a fixed number of trials, geometric has a fixed number of success
both are true
Caller calls randomly picked ballers that has a letter and number… If we want to calculate the probability of player winning after 14 balls have been called we should use the
hypergeometric
The binomial distribution has an indefinite number of trials and the geometric distribution has a fixed number of trials
false
Which of the following distributions has dependent trials
hypergeometric
For the binomial distribution which of the following is true
p + q = 1
For any distribution as the random variable x gets further awaythe probability of that X happening..
Decreases
Less likely to happen
Visualize normal distribution (tails less likely to happen)
_ of the cases fall between +/- 3 sigma in a standard normal distribution
99.73
What variables define the standard normal distribution
mean and sd
What is the probability for: x = 100?
0%
this one had a piece missing so :/
Corporate randomly selects 4 cities and surveys all holders in selected cities. This is an example of..
cluster sampling
After submitting my quiz I should..
Log out, sign out with instructor by showing my ID, leave quietly
mean median and mode
Mean always pulled by outlier
Median always in middle
Mode is always the highest point
If mean > median then…
The shape of the distribution is skewed to the right
