seems these days that students have to work more and more each week to be able to afford the costs of college. For a recent labor survey conducted by the government, there were 77 respondents who were working while attending college. The frequency distribution below summarizes the number of hours worked per week as reported by the respondents.
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.
seems these days that students have to work more and more each week to be able to afford the costs of college. For a recent labor survey conducted by the government, there were
| Number of hours worked per week (hours per week) |
Frequency |
|---|---|
|
26
30
|
8
|
|
31
35
|
24
|
|
36
40
|
19
|
|
41
45
|
14
|
|
46
50
|
9
|
|
51
55
|
3
|
Based on the frequency distribution, using the midpoint of each data class, estimate the mean number of hours worked per week by the respondents. For your intermediate computations, use four or more decimal places, and round your answer to one decimal place.
|
hours per week
|
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