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The XYZ Corporation is interested in possible differences in days worked by salaried employees in three departments in the financial area. A survey of 23 randomly chosen employees reveals the data shown below. Because of the casual sampling methodology in this survey, the sample sizes are unequal. Research question: Are the mean annual attendance rates the same for employees in these three departments? Days Worked
Days Worked Last Year by 23 EmployeesDepartment Days WorkedBudgets(5 workers) 278 260 265 245 258Payables(10 workers) 205 270 220 240 255 217 266 239 240 228Pricing(8 workers) 240 258 233 256 233 242 244 249
Of 900 consumers surveyed, 414 said they were very enthusiastic about a new home decor scheme. What is the 99% confidence interval for the population proportion?
A study was done on the accuracy of advertisements by the five types of electronics stores in a city. On each of the six days, items were randomly selected from the advertisements for each type of store and the actual price was compared to the adv..
Evaluate the area under the standard normal curve that lies to the left of z = - 3.49 and simple random sample of size
Assume men's weights are normally distributed w/ a mean of 172 lb. and a s.d. of 29lb.
Using the 0.99 confidence coefficient, what are the confidence limits for the proportion that plan to vote for the Democratic incumbent.
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Product while 43 out of 80 females preferred it. Compute the test statistic and use technology to find the corresponding p-value based on this test.
Explain the purpose of the critical value in a hypothesis test, how do you find the critical value and what purpose does it play?
What is the value of the population mean? What is the best estimate of this value?
Explain why the polls that are so frequently quoted during early returns on Election Day TV coverage are an example of cluster sampling.
What is the probability of a type 1 error in this situation? What does it mean?
Based on these data, does it seem that strength of relationship between sales and promotions expenditures is enough to permit using linear regression forecasting model? Describe why?
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