In order to increase employment, France mandated that all companies with 20 or more employees reduce the workweek to 35 hours. The economic impact of this shortened workweek policy was analyzed. In the year prior to the 35-hour-workweek law, unemployment rate in France was at 12%. Suppose that in a random sample of 500 French citizens (eligible workers) taken several years after the law was enacted, 53 were unemployed. a. Please find a 90% confidence interval for French unemployment rate after the enactment of the 35-hour-workweek law.  b. Conduct a test of hypothesis to determine if the French unemployment rate dropped after the enactment of the 35-hour-workweek law. Please test with 0.05 level of significance.

A statistical program is recommended. Jensen Tire & Auto is in the process of deciding whether to purchase a maintenance contract for its new computer wheel alignment and balancing machine. Managers feel that maintenance expense should be related to usage, and they collected the following information on weekly usage (hours) and annual maintenance expense (in hundreds of dollars). Weekly Usage (hours) Annual Maintenance Expense 13 17.0 10 22.0 20 30.0 28 37.0 32 47.0 17 30.5 24 32.5 31 39.0 40 51.5 38 40.0 (a) Develop the estimated regression equation that could be used to predict the annual maintenance expense (in hundreds of dollars) given the weekly usage (in hours). (Round your numerical values to two decimal places.)

Consider a researcher who is exploring new potential treatments for specific forms of cancer. This researcher is extremely focused on avoiding mistakes in concluding that treatments that may very well be effective are ineffective when conducting their research. What should this researcher do?     a. set a higher alpha level   b. set a higher sample mean   c. set a lower alpha level   d. set a lower sample mean

8.2  Question 3).  According to the February 2008 Federal Trade Commission report on consumer fraud and identity theft, Arkansas had 1,601 complaints of identity theft out of 3,482 consumer complaints ("Consumer fraud and," 2008). Calculate a 90% confidence interval for the proportion of identity theft in Arkansas.

The picture is attached. If it is not clear, the shaded region of the graph represents 5%. Thanks in advance.

A statistical program is recommended. Jensen Tire & Auto is in the process of deciding whether to purchase a maintenance contract for its new computer wheel alignment and balancing machine. Managers feel that maintenance expense should be related to usage, and they collected the following information on weekly usage (hours) and annual maintenance expense (in hundreds of dollars). Weekly Usage(hours) AnnualMaintenanceExpense 13 17.0 10 22.0 20 30.0 28 37.0 32 47.0 17 30.5 24 32.5 31 39.0 40 51.5 38 40.0   #1) Develop the estimated regression equation that could be used to predict the annual maintenance expense (in hundreds of dollars) given the weekly usage (in hours). (Round your numerical values to two decimal places.) #2) The expected expense of a machine being used 34 hours per week is $ hundred.

Estimating income tax based on dividends is also not​ straightforward, due in part to​ Australia’s franking credit scheme.​ Mike is looking to simplify total annual tax projections for a share portfolio based simply on the share​ portfolio's current value. To do​ this, he wishes to determine if there is any statistically significant linear relationship between the two.   Mike has randomly sampled 30 individuals with share portfolios over​ AUD$100,000 and mapped the assessed value of the portfolio​ (in AUD​ $1000) to the total taxes paid on that amount​ (in AUD$1). ​ Mike's data is in the table below.   Assessed Value Taxes 426.1 5014 368.8 3698 309.8 3691 373.9 5189 445.7 4455 505.1 5189 342.3 3416 343.6 3931 432.3 4393 329.2 3267 291.2 2871 399.3 4013 392.7 4728 482.2 4885 480.6 4888 390.8 3917 371.6 3738 311.9 3098 343.7 3633 304.7 3538 274.6 3427 457.1 4633 231.5 4009 450.5 4565 510.1 5946 308.4 3045 348.8 3504 410.4 3375…