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A metropolitan school system consists of two districts-north and south. The north district contains 60% of all students, and the south district contains 40% of all students. A minimum competency test was given to all students. 10% of the north district students failed, and 15% of the south district students failed. What is the probability that a student from the entire school system, chosen at random, has passed?
a) 0.80
b) 0.85
c) 0.88
d) 0.90
Consider the experiment of rolling a pair of dice. Suppose that we are interested in the sum of the face values showing on the dice.
Explain why we need to use the t distribution. What assumption do you need to make?
A probability value of .25 means that an event will occur:
Illustrate the regression model and predict it. The following table shows the yearly maintenance costs for several cars, as well as their age.
Florida State University administers a test of mathematics placement to students when they first enter the university.
To give 98% confidence interval for population mean μ, you would use critical value.
The registrar of a college with a population of N=4,000 full-time students is asked by the president to conduct a survey to measure satisfaction with the quality of life on campus.
Take a confidence interval for the difference in the average of renting between the first andthird hotel.
We are establishing a quality control program for a process and need to establish the mean and standard deviation for the process. The first 10 batches had samples of size 5 taken.
The simple coefficient of determination is the proportion of total variation explained by the regression line.
Create a scatter diagram and consider the correlation for the given data. Create a scatter diagram and sketch the line you think best fits the data.
Identify the sampling distribution to be used: the standard normal distribution or the Student's t distribution. Find the critical value(s).
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