Is there a difference in the mean satisfaction level among the four airlines? Use the .05 significance level.
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.
A group of four carriers recently hired Muir Marketing Research Inc. to survey passengers regarding their level of satisfaction with a flight they just took. These responses were totaled, so the total score was an indication of the satisfaction with the flight. The greater the rating, the higher the level of satisfaction with the service. The highest possible rating was 100. Samantha Muir randomly selected and surveyed passengers from the four airlines. Is there a difference in the
|
Obs # |
Air Waves |
Belle Air |
Cirrus Airline |
Debonair |
|---|---|---|---|---|
|
1 |
94 |
75 |
70 |
68 |
|
2 |
90 |
68 |
73 |
70 |
|
3 |
85 |
77 |
76 |
72 |
|
4 |
80 |
83 |
78 |
65 |
|
5 |
88 |
80 |
74 |
|
|
6 |
68 |
65 |
||
|
7 |
65 |
what is the ANOVA?
what is the hypothesis? ( H0, HA)
what is decision criteria? α =?, Graph (2-tailed, right or left), type of distribution ( t, z, x^2 or F) and what are left and right critical value?
what is calculated value? (Z-Calculated, t-Calculated, χ2-Calculated, F-Calculated) = ?
what can we conclude, do we reject null hypothesis?
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