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2. In order to determine the average amount spent in November on Amazon.com a random sample of 144 Amazon accounts were selected. The sample mean amount spent in November was $250 with a standard deviation of $25. Assuming that the population standard deviation is unknown, what is a 95% confidence interval for the population mean amount spent on Amazon.com in November?

a. The time (in years) it takes a sample of students to graduate college (Mean)

* It is a global coffee brand built upon a reputation for fine products and services. It has almost 16,000 cafes in almost 40 countries.

For the first time since the Industrial Revolution, less than _____ percent of the American workforce was employed by manufacturing.

4. Calculate the following measures of central tendency for the set of cube measurement data. Show your work or explain your procedure for each.

Select an existing production organization. Analyze the organization’s current vision, mission, business strategy, operation strategy, supply chain, total quality management, just-in-time philosophy, forecasting method, statistical technique, facility location, work design, project life cycle, and project management. Note: You will need this information in order to complete this and subsequent assignments.

Find the area under the standard normal curve to the left of z = -1.25.

3. Write the answer to the following problems in the correct number of significant figures.

11. The frequency histogram below describes the distribution of the lifetimes of 220 light bulbs.

(c) The mean of the sample and the value of Z with an area of 5% in the left tail.

10. Identify whether these distributions are negatively skewed, positively skewed, or not skewed at all, and why.

2. For the following set of scores, fill in the cells. The mean is 74.13 and the standard deviation is 9.98.

2. _C____ Divide your subjects in half. One group receives one treatment of the independent variable and the other group receives a different treatment of the independent variable. Subjects were all told they were going to see a video of a therapist's session after which they would rate the quality of the session. The groups differed in that the subjects in one group were told that prior evaluations indicated that the therapist was effective whereas subjects in the other group were told that the evaluations indicated the therapist was not effective. These different subjects were used for the two levels of the independent variable: subjects were in either the "effective therapist" or the "ineffective therapist" condition.

2) Compute the standard deviation for each of the four samples. Does the assumption of .21 for the population standard deviation appear reasonable?

For problems requiring computations, please ensure that your Excel file includes the associated cell computations and/or statistics output; this information is needed in order to receive full credit on these problems.