The data in the accompanying table gives the food segment (burger, chicken, pizza, or sandwich) and average sales per unit ($ thousands) for each of 28 quick-service brands. Complete (a) through (d) below. Click here to view the data table. a. At the 0.05 level of significance, is there evidence of a difference in the mean U.S. average sales per unit (S thousands) among the food segments? Determine the hypotheses. Choose the correct answer below. O B. Ho: H, = H2 =... H28 O A. Ho: H1= H2 = H4 H;: Not all H are equal (where j= 1,2,.4) H: Not all p, are equal (where j= 1,2,.,28) O D. Ho H = H2= 28 OC. Ho: H1 = H2 =.. =H4 H;i H, # Hz# • • • H4 b. Find the test statistic. ESTAT=O (Round to two decimal places as needed.) c. Determine the critical value. F« = (Round to two decimal places as needed.) d. Reach a decision. Ho. There is evidence of a difference in the mean U.S. average sales per unit among the food segments.
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.
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