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Revenue in a cosmetics company comes mostly from their hair products' sales. The marketing department wants to estimate the proportion of customers who buy shampoo. How many customers do they need to sample to get a confidence interval for the true mean at 98% confidence level, with an error of +/- 0.02?
If none is satisfactory, explain. (e) Make a forecast for 2004 by using a trend model of your choice or a judgment forecast.
1. Describe the situation faced by Kara. 2. What would you do if you were Kara? 3. What are the ethical considerations, if any, in this case?
A Seattle department store sampled 87 items sold in January and found that 5 of the items were returned.
Find the probability that in a sample of six cars: All six will have the transponder, At least three will have the transponder and None will have a transponder.
A survey of undergraduate students in the School of Business at Northern University revealed the following regarding the gender and majors of the students:
White blood cell counts for a group of volunteers before being innoculated, and white blood cell counts for a second group of volunteers after being innoculated.
an online site presented this question would the recent norovirus outbreak deter you from taking a cruise? among the
the average salary of a male full professor at a public four-year institution offering classes at the doctoral level is
the average gasoline price of one of the major oil companies has been 3.00 per gallon. because of shortages in
a. What is the population proportion of people who moved to the suburb in the last five years?
Develop a trend line using the data in the table. Use this to forecast sales for each quarter of year 5. What does the slope of this line indicate?
A new product is tested on a random sample of 90. A total of 63 say they will buy the new product. A point estimate of the population proportion who will buy the product is 63/90 or .7 (70%). What is the standard error of the proportion?
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