In a city with three high schools, all the ninth graders took a Standardized Test, with these results: Number of ninth graders High School Mean score on test Glenwood 77 279 Central City Lincoln High The city's PR manager, who never took statistics, claimed the mean score of all ninth graders in the city was 78.3. Of course, that is incorrect. What is the mean score for all ninth graders in the city? Round to one decimal place. 91 315 67 190
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.
![Get a similar question
You can retry this question below
In a city with three high schools, all the ninth graders took a Standardized Test, with these results:
Number of ninth graders
High School
Mean score on test
Glenwood
77
279
Central City
91
315
Lincoln High
67
190
The city's PR manager, who never took statistics, claimed the mean score of all ninth graders in the city
was 78.3. Of course, that is incorrect. What is the mean score for all ninth graders in the city? Round to
one decimal place.
mean of all ninth grader's scores =
Enter an integer or decimal number [more..]
Submit Question
Question 7
B0/1 pt O5 99
Details
Type here to search
近](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F0b90ef4d-cf97-4ffe-ab37-4fdcb842b513%2Fc1be0cfb-d91e-4dd7-be49-3391ee15103f%2Fs31dmfq_processed.jpeg&w=3840&q=75)
Trending now
This is a popular solution!
Step by step
Solved in 2 steps
