Statistics: Regression Analysis and Individual Assignment Submission

·  How were measures of central tendency used in the study? Did the study use the most appropriate measure of central tendency for the given data? Why or why not?

(2) Give that a sample of 25 had x = 75, and (x-x)² = 48 the mean and standard

Hypothesis is typically used in quantitative research only. Moreover, when a question poses an inquiry on the relationship between two variables, a hypothesis is a statement declarative in nature of the relationship between different variables (Pajares 2007). A researcher chooses whether to use a question or a hypothesis depending on the purpose of the research, its objectives, the methodology for the research and the preference of the audience to receive the research. A researcher must be able to interpret the final outcome with reference to the research questions or the hypothesis used (Pajares 2007). A research requires a minimum of two hypotheses namely a null and an alternative hypothesis.

Select one (1) project from your working or educational environment that you would use the hypothesis test technique. Next, propose the hypothesis structure (e.g., the null hypothesis, data collection process, confidence interval, test statistics, reject or not reject the decision, etc.) for the business process of the selected project. Provide a rationale for your response.

a. Determine the critical value(s) of a 91.5% confidence interval for the mean time it take for all workers who are employed in downtown Toronto to get to work

Is this estimate centered about the parameter of interest (the parameter of interest is the answer for the mean in question 2)?

3. Sample Population: Who exactly was used in the study? How many? (Be as specific as possible.)

Be sure to show the data from your sample and the data to support your estimate.

What is the value of the population mean? What is the best estimate of this value?

The customers in this case study have complained that the bottling company provides less than the advertised sixteen ounces of product. They need to determine if there is enough evidence to conclude the soda bottles do not contain sixteen ounces. The sample size of sodas is 30 and has a mean of 14.9. The standard deviation is found to be 0.55. With these calculations and a confidence level of 95%, the confidence interval would be 0.2. There is a 95% certainty that the true population mean falls within the range of 14.7 to 15.1.

Fry Brothers heating and Air Conditioning, Inc. employs Larry Clark and George Murnen to make service calls to repair furnaces and air conditioning units in homes. Tom Fry, the owner, would like to know whether there is a difference in the mean number of service calls they make per day. Assume the population standard deviation for Larry Clark is 1.05 calls per day and 1.23 calls per day for George Murnen. A random sample of 40 days last year showed that Larry Clark made an average of

b. The investigators, of the secondary data which I will be using, operationalized their variables by surveying 80,237 individuals across the United States and documenting their contact with the police. The data was collected between July 1, 2005, through July 31, 2005, using a stratified multistage cluster sample. A weight was used in order to obtain national estimates. In addition, the mode of data collection was

3. In testing the difference between the means of two independent populations, if neither population is normally distributed, then the sampling distribution of the

d. What was the cost for the 10 percent of employees who incurred the highest dental expense?

This assignment requires a considerable amount of computer work and written comment. You may need to seek guidance from your tutor along the way. Do not leave things until too late. Each question carefully describes what you are required to do, so please follow these carefully.