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A computer repair shop gets computers on regular basis for repairs. The repair time between two computers is exponentially distributed with mean time between repairs of two computers being 2 hours. Find the conditional probability that a repair of a computer takes at least 10 hours given that duration of the repair exceeds 9 hours. Re-compute the answer if distribution of repair time is assumed to be uniformly distributed between 0 and 20 hours.
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When planning the new baseball stadium for Washington DC, you are asked to find the break-even point for the number of luxury skyboxes built.
if the mean value of a set of data including 6 sample tests is 20 and the standard deviation of the data is 5 what is
The level of satisfaction in a consumer survey would represent what level of measurement?
Can the college conclude that the students in the new program are significantly different from the rest of the freshman class? Use a two-tailed test with α=.05.
You survey a sample of 10 college students to measure their racial prejudice using a scale of 0 (no prejudice) to 100 (extreme prejudice). Here are the scores you obtained.
The college theater department recently staged a production of a modern musical. A researcher recorded the gender of each student entering the theater and found a total of 385 females and 215 males.
The Z score on the comparison distribution for the sample score, and (c) your conclusion. Assume that all populations are normally distributed.
Using the 0.05 level of significance, is there evidence that the population mean is above $300? What is your answer in (a) if s = $90 and the 0.10 level of significance is used?
Patient does not have disease occurs 1% of the time. If a randomly selected individual is positive what is the probability that the individual has the disease?
A gallop poll that was based on telephone interviews conducted April 9-12, 2012, using a random sample of 1016 adults aged 18 and older, living in all 50 US states and the District of Columbia, indicated that 29% of Americans spent more money in rece..
What is the null hypothesis in a chi-squared test of independence? List the assumptions under which the linear regression model is supposed to work.
Find a 95% confidence interval for the population mean concentration of uric acid in this patients blood. What is the margin of error?
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