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An accounting professor claims that no more than one-quarter of undergraduate business students will major in accounting. What is the probabillity that in a random sample of 1,200 undergraduate business students, 336 or more will major in accounting?
The Stroop task is when color words are printed in the wrong color; for example, the word red might be printed in the color blue.
Consumer Review posts reviews and ratings of a variety of products on internet. The following is a sample of 20 speaker systems and their ratings (www.audioreviews.com).
You want to show an increase in buying and selling of single-family homes this year when compared with last year's rate.
A survey of 120 high school students shows that 39 of them work over 20 hours per week during the school year. Does it demonstrate the conjecture that more than 25% of the high school students work over 20 hours per week during the school year?
In Dallas, some fire trucks were painted yellow (instead of red) to heighten their visibility. During a test period, the fleet of red fire trucks made 153,348 runs and had 20 accidents
If he calls on four potential clients, what is the probability that he makes exactly 3 sales? What is the probability that he makes exactly 4 sales?
Do the data indicate a significant difference? Test with ∝ = .05.
How would you use the "margin of error" in estimating the percentage of all adults who think that Venetian blinds are the hardest to clean?
Use a 0.01 significance level to test the claim that the selection process is biased against Americans of Mexican ancestry. Does the jury selection system appear to be fair?
What is the 95% confidence interval estimate of the mean television viewing time per week during the 8:00 p.m. to 11:00 p.m. time period?
The Food King Chain employs more than 3,000 people. The worker's ages are approximately normally distributed, with a mean of 31 years and a standard deviation of 4.3 years.
What are differences between dependent and independent samples? Provide examples. What are the implications for determining the tests used to analyze data?
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