General Course Revision Flashcards
(23 cards)
How can you calculate the number of classes in a histogram?
Equation= SQRT(Count)
Is the data distribution skewed when the mean, mode and median are equal?
No, this is false. If the mean, mode and median are equal the data follows a normal distribution
What does the F-test measure?
The difference of means
What does it mean if the mean, mode and median are all the same?
The data is distributed symmetrically
What does the small n represent?
A sample from the main population
Describe qualitative data?
Categorical and non numerical in nature
How do you calculate the IQR?
Q3-Q1
In a negatively skewed dataset, how does the mean compare to the median?
The mean is less than the median
How many tails are involved in an F-test?
One tail, it is a one tailed test.
How if the f-stat calculated?
Dividing the larger variance by the smaller
What does the t-test do?
Compares the means of two groups.
What is in the Upper Confidence and Lower Confidence levels?
-Is a range that is likely to contain an unknown population parameter
When do you use the confidence. t function in excel?
When the data does not follow a normal distribution and if the data set is small.
What is skewness?
Distortion or asymmetry in a normal distribution
What does a z-score of -1.0 indicate?
The value is two standard deviations below the mean.
What can be an indicator that the data does not follow a normal distribution?
If the mean is much smaller than the median.
What type of data has a true zero?
Ratio
What t-test would you use to compare a single population before and after an experiment?
Paired t-test
What does the count function calculate?
Number of data points/ observations
How to preform a 95% confidence function in excel?
=confidence.t(0.05, ST.DEV, COUNT)
What z-score does the mean have?
0
What scale is probability measured on?
0-1
What denotes an absolute reference?
$B4$
