Stefan Irwin, Marketing Manager at Classic Merchandise, is investigating response rates to scented and unscented direct mail catalogues. If the response rate for the scented catalogue (population 1) is higher, Mike will adopt the scented version. His staff randomly selects two samples of 200 each from the company’s customer database. One month after the 400 test catalogues were mailed, forty-five orders (twenty-five from the scented and twenty from the unscented) were received from the test catalogues. Assuming a = .01, Mike’s alternate hypothesis is ________________.
举一反三
- Replacing two catalogues with one has meant that A: all the lines from both catalogues are available. B: the catalogue has now become cheaper to produce. C: sales from the stores are already increasin
- Replacing two catalogues with one has meant that A: all the lines from both catalogues are available. B: the catalogue has now become cheaper to produce. C: sales from the stores are already increasing.
- A researcher is interested in testing to determine if the mean of population one is greater than the mean of population two. The null hypothesis is that there is no difference in the population means (i.e. the difference is zero). The alternative hypothesis is that there is a difference (i.e. the difference is not equal to zero). He randomly selects a sample of 9 items from population one resulting in a mean of 14.3 and a standard deviation of 3.4. He randomly selects a sample of 14 items from population two resulting in a mean of 11.8 and a standard deviation 2.9. He is using an alpha value of .10 to conduct this test. Assuming that the populations are normally distributed, the critical t-value from the table is _______.
- Angela knows that Mike worked for Findlay's IT company from ________.
- Most speeches contain __________ main points. A: from two to five B: from one to three C: from two to eight D: from three to five