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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?
Select a US citizen and a citizen of China at random, independently of one another. Determine the probability that both have type O blood?
A researcher looks at the effect of 3 different drugs on 3 different groups of 10 people. Numbers refer to stress levels, with lower numbers being lower stress.
Develop a 90 percent confidence interval for the proportion opposing health care changes. (Round your answers to 4 decimal places.)
Be certain to mention the direction of the relationship, the strength of the relationship, and whether our findings are statistically significant
Using Analysis of Variance (ANOVA) test at 5% level if there are important differences in mean sales calls made across the three branches.
What critical value should the company officials use to determine the rejection region?
A random sample of students is selected, and each one is asked to try first brand A and then brand B, or vice versa with the order determined at random.
What percentage of the averages or medians of the sample will be greater than 140 seconds?
The first and third quartiles were 17.95 and 35.45 miles per gallon, respectively, Develop a box plot and comment on the distribution. Is it a Symmetric distribution?
Prepare a frequency distribution from data given below that describes how long it took a person to drive to work in work week.
It is estimated that 2% of the athletes competing in a large tournament are users of an illegal drug to enhance performance. The test for this drug is 95% accurate. What is the probability that an athlete who tests positive is actually a user?
A popular snack is packed by machine into 9-ounce boxes. The distribution of box weights is normally distributed with a mean of 9 ounces and a variance of 0.01 ounces. What is the probability of randomly selecting a box containing less than 8.9 ou..
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