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An e-commerce research company claims that 60% or more graduate students have bought merchandise online. A consumer group is suspicious of the claim and thinks that the proportion is lower than 60%. A random sample of 80 graduate students shows that only 36 have ever done so. Is there enough evidence to show that the true proportion is lower than 60%? Conduct the test at a 10% significance level.
The standard screening test for Down's Syndrome is based on combination of maternal age and the level of serum alpha-fetoprotein. Using this test 80% of Down's syndrome cases can be identified, while 5 % of normals are detected as positive.
A bank with branches in a large metropolitan area is considering opening its offices on Saturday, but it is uncertain whether customers will prefer (1) having walk-in hours onSaturday or (2) having extended branch hours during the week. Listed bel..
Researchers testing a new medication find that 7% of users have side effects. To how many pa- tients would a doctor expect to prescribe the medication before finding the first one who has side effects?
In hypothesis testing, the level of significance is? When would you use a t test and when would you use an f test ? You are interested in the assumption that adult students earn better grades than traditional students.
production engineers at sinotron believe that a modified layout on its assembly lines might increase average worker
Calculate the mean attitude score toward the Springdale Mall shopping area and compute the sample standard deviation. Does this area seem to be well regarded by the respondents?
in a survey of 9000 females. 6431 say they change their nail polish once a week. construct 90 and 95 confidence
In project management, the WBS helps with the calculation of the cost, time and work effort as well as the gathering of requirements from the customer.
a box is to be constructed so that its height is five inches and its base is y inches by y inches where y is a random
question the probability that an individual egg in a carton of eggs is cracked is 0.03. you have picked out a carton
in a large lb department store the average waiting time at the toys checkout counter is 5 minutes with a standard
Is there evidence to suggest a difference in the mean waiting times at the four body shops? Use the .05 significance level.
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