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A survey from Teenage Research Unlimited found that 30% of teenage consumers receive their spending money from part-time jobs. If five teenagers are selected at random, find the probability that at least three of them will have part-time jobs.
Scores of an aptitude test are normally distributed with a mean of 280 and a standard deviation of 30. Determine the percentage of samples of size 4 that have a mean score within 21 points of the population mean score of 280.
The Speedy Oil Change Company advertised a 15-minute wait for an oil change. A sample of 23 oil changes showed a mean time of 16.5 minutes and a standard deviation of 4.3 minutes.
Do you think this detection bias would strengthen or attenuate the association between vegetarian diet and learning disabilities? Defend your choice briefly.
If garage is robbed, determine the probability doors were left open?
What is the p-value? Use a .05 level ofsignificance. What is your conclusion?
q1. consider the following stem and leaf plotstemnbspnbspnbspnbspnbspnbsp leaf1 nbsp nbsp nbsp nbsp 0 2 5 72 nbsp nbsp
At the .01 level of significance, do these data support the conclusion that the ferritin distribution in elderly men has a smaller variance than in younger men?
the average hourly wage of workers at a fast food restaurant is 6.50hr with a standard deviation of 0.45. assume that
the following eight observations were randomly selected from two populations that were not necessarily normally
A sample of 16 consumers is taken. The average age in the sample was 22.5 years with a standard deviation of 5 years. Construct a 95% confidence level.
A company is interested in knowing which are the potential sales next year if you use $ 20,000 in advertising expenses. The company uses the information from previous years to make its sales forecast.
If you draw a ball, record the color then draw a second without replacing the first ball, what is the probability of choosing two green balls?
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