Using Excel construct a scatter plot. Discuss the output of the scatter plot. Give (or calculate) the correlation coefficient. Give (or calculate) the coefficient of determination.
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.
#6 pt 1
Consider the following data:
A women’s clothing department wants to find out if there is a relationship (and what kind of relationship) between the price of an item and the time that it takes to a customer to decide in buying that item.
|
Item Price (x) |
Decision Time (in minutes) (Y) |
|
$30 |
12 |
|
$20 |
8 |
|
$300 |
37 |
|
$80 |
20 |
|
$78 |
15 |
|
$25 |
10 |
|
$17 |
9 |
|
$63 |
14 |
|
$150 |
20 |
|
$250 |
30 |
|
$10 |
4 |
|
$8 |
5 |
|
$180 |
27 |
|
$260 |
28 |
NOTE: For the following questions you can use excel analysis or a calculator, it is your choice. The
- Using Excel construct a scatter plot. Discuss the output of the scatter plot.
- Give (or calculate) the
correlation coefficient . - Give (or calculate) the coefficient of determination.
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