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In a survey of undergraduate library usage, it was found that 76% of seniors, 59% of juniors, 50% of sophomores, and 28% of freshmen use the library frequently. Suppose that 17% of the undergraduates are seniors while the corresponding percentages for juniors, sophomores, and freshmen are 18%, 19%, and 46% respectively. What percent of the students use the library frequently? Suppose you see a student use the library everyday. What is the probability that this student is a freshman?
for University Y, M = 4, S2 = 1.5; and for University Z, M = 6, S2 = 2.5. What should you conclude? Use the .05 level. (a) Use the steps of hypothesis testing, (b) figure the effect size for the study.
Five test vehicles of each kind were crashed, with results given below. Research question: Are mean crash damages the same for these 3 vehicles?
21st Century Insurance Company claims that telephone calls for policy holder information are answered in at most 3 minutes. A random survey of 36 phone calls results in the mean 3.3311 and standard deviation 2.1788.
How would you respond if someone told you that the correlation between education level and salary was 1.27?
jim is in the 23rd percentile rank and jessica is in the 59th percentile rank. the variable is age and not at all
the average hourly wage of workers at a fast food restaurant is 6.50hr with a standard deviation of 0.45. assume that
Based on long term experience, the standard deviation can be taken to be $2.92. Find a 90% confidence interval for the average amount left by all groups.
a) Do a test to see if workers attitudes on this matter have changed using a 90% alpha. b) Explain to management what your findings are and what this suggests about future decisions vs work options.
Derive the formula for the expected value Y, derive the formula for the moment generating function of Y
Does knowing high school seniors' IQ scores indicate anything about their high school graduation grade point averages and Is there a relationship between a person's sociability and cheerfulness
consider writing onto a computer disk and then sending it through a certifier that counts the number of missing pulses.
Among 500 freshmen pursuing a business degree at a university, 347 are enrolled in an economics course, 247 are enrolled in a mathematics course, and 120 are enrolled in both an economics and a mathematics course. What is the probability that a..
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