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"A metropolitan school system consists of three school districts-norths, south, central. The north district contains 25% of all students, the south district contains 40%, and the central district contains 35%. A minimum-competency test was given to all students; 10 % of the north district students failed, 15% of the south district students failed, and 5% of the central district students failed.
a) Develop a probability tree showing all marginal, conditional, and joint probabilities.
b) Develop a joint probability table.
c) What is the probability that a student selected at random failed the test?
Gerald takes the ACT mathematics test and scores 23. ACT math scores are Normally distributed with mean 22.4 and standard deviation 4.2. Find the standardized scores for both students.
Compute the value of t. What is your decision regarding the null hypothesis? Briefly summarize your results.
What is the probability that a simple random sample of 40 male graduates will provide a sample mean within $10,000 of the population mean, $168,000 (to 4 decimals)?
When using SPSS to perform a 2 independent sample t-test, the P-Value was .136...with alpha set to .05. I have to decide to accept or reject the null hypothesis.
Suppose that a quarter is randomly selected, what is the probability that this quarter has high productivity growth and has a large pay increase?
Gigi has rolled a natural on four straight tosses of the dice. This excites the gamblers standing around the table.
Create a 99% confidence interval for mean overall duration of symptoms in population of individuals who used zinc lozenges.
What are the advantages and disadvantages of the surveying methods you did not used and what type of score did you use why?
Joe thinks that no more than 20% of students in his Statistics class will get an A in the final examination. To prove his claim, he takes a random sample of 35 students and finds to his surprise that 30% of students got an A.
Mothers did not take the drug DES during pregnancy , what is the estimate of the number of women out of 1000 who would be expected to have tissue abnormalities?
In other words, both variables have the same mean but different standard deviations. Draw rough sketches of the two normal curves on the same graph.
determine if the improvement is of practical significance one should. Crop researchers plant 100 plots with a new variety of corn. The average yield for these plots is x' = 130 bushels per acre
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