1. A relative frequency histogram having a longer tail to the right than to the left is said to be ________. a. skewed to the left b. normal c. a scatter plot d. skewed to the right 2.A plot that allows us to visualize the relationship between two variables is a(n) ________ plot. a. frequency b. scatter c. dot d. ogive 3.If a population distribution is skewed to the right, then, given a random sample from that population, one would expect that the ________. a. median would be greater than the mean b. mode would be equal to the mean c. median would be less than the mean d. median would be equal to the mean 4. In the calculation of a mean for grouped data, ________ are used. a. total sample size and sum of the midpoints of each class b. total sample size and sum of the weighted midpoints c. sum of the frequency of each class and the sum of the midpoints of each class d. sum of the frequency of each class and the sample midpoint 5. Which of the following is not an example of unethical statistical practices? a. inappropriate interpretation of statistical results b. using graphs to make statistical inferences c. improper sampling d. descriptive measures that mislead the user
Inverse Normal Distribution
The method used for finding the corresponding z-critical value in a normal distribution using the known probability is said to be an inverse normal distribution. The inverse normal distribution is a continuous probability distribution with a family of two parameters.
Mean, Median, Mode
It is a descriptive summary of a data set. It can be defined by using some of the measures. The central tendencies do not provide information regarding individual data from the dataset. However, they give a summary of the data set. The central tendency or measure of central tendency is a central or typical value for a probability distribution.
Z-Scores
A z-score is a unit of measurement used in statistics to describe the position of a raw score in terms of its distance from the mean, measured with reference to standard deviation from the mean. Z-scores are useful in statistics because they allow comparison between two scores that belong to different normal distributions.
1. A relative frequency histogram having a longer tail to the right than to the left is said to be ________.
a. skewed to the left
b. normal
c. a
d. skewed to the right
2.A plot that allows us to visualize the relationship between two variables is a(n) ________ plot.
a. frequency
b. scatter
c. dot
d. ogive
3.If a population distribution is skewed to the right, then, given a random sample from that population, one would expect that the ________.
a.
b.
c. median would be less than the mean
d. median would be equal to the mean
4. In the calculation of a mean for grouped data, ________ are used.
a. total sample size and sum of the midpoints of each class
b. total sample size and sum of the weighted midpoints
c. sum of the frequency of each class and the sum of the midpoints of each class
d. sum of the frequency of each class and the sample midpoint
5. Which of the following is not an example of unethical statistical practices?
a. inappropriate interpretation of statistical results
b. using graphs to make statistical inferences
c. improper sampling
d. descriptive measures that mislead the user
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