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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 who has failed the test came from the South District?
a) 0.15
b) 0.40
c) 0.50
d) 0.75
What is the probability of a fatal accident over a lifetime?
(A) What sums are needed to calculate a correlation coefficient? (B) What are the two ways of testing a correlation coefficient for significance?
Stating assumptions on which your arguments and conclusions are based, sum up the statistical evidence regarding effectiveness of this diet.
Sixty-four students in an introductory college economics class were asked how many credits they had earned in college, and how certain they were about their choice of major.
Z score on comparison distribution for sample score and your conclusion. Suppose that all population are normally distributed.
Formulate the hypotheses to test to see if the mean of the population is at least 12 ounces.
What is an appropriate sample space for this experiment?
A student team examined parked cars in four different suburban shopping malls. One hundred vehicles were examined in each location. Research question: At α = . 05, does vehicle type vary by mall location?
To test whether there is any association between two variables using Chi-Square test for independence.
Book inventory Record information - Ratio, interval, nominal or ordinal.
The distribution of lifetimes for a certain type of light bulb is normally distributed with a mean of 1000 hours and a standard deviation of 100 hours. Find the 33rd percentile of the distribution of lifetimes.
Compute a 95% confidence interval for the mean using the formula and where is the mean of the ten random numbers.
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