b. For each of the four items listed, indicate whether the variable is categorical or numerical.…
1. Suppose a researcher wants to design a new study with a power of 0.8 and a significance of 0.05 to test whether the caffeine content for a brand of coffee is really 100mg. A previous study gave a mean caffeine level for this brand of 110 mg and a standard deviation of 7 mg. Use PROC POWER to determine how many cups of coffee need testing.…
X is a data frame as derived from the program R shown above in Figure 1. There are 274 observations of 11 variables. The number of observations is obtained from the number of rows while the number of variables is obtained from the number of columns.…
3) Data Description For each of the variables, at least 30 observations of cross-sectional data must be obtained. Thus for the final research paper, a data matrix that is at least 30 rows by numbers of variables must be presented.In one paragraph, identify the data sources and describe the data (i.e., which government agencies supply the data, which methods are used to compile them, when they were collected, etc.).…
a. Enter the stock symbol. On the page for that stock, click “Historical Prices” on the left side of the page.…
Investments. Who – 48 China/India/Chindia funds listed at globeinvestor.com. What – 1 month, 1 year, and 5 year returns for each fund. When – The most recent periods of time. Where – globeinvestor.com website. Why – To compare investment returns for future investment decisions. How – globeinvestor.com uses reports from the fund companies. Variables – There are three variables, all of which are quantitative. 1 month return; 1 year return; 5 year…
2-The average time it takes a four person - crew to build the frame of a certain type of house is two 40-weeks, or (4 workers) (2 weeks) (40 hoýrs per week) = 320 labor hours. The standard deviation is 50 labor - hours. If framing time is normally distributed, what is the probability that the time to frame a house is a) more than 320 labor - hours? b) from 280 to 360 labor hours? c) more than 260 labor hours? d)from 260 to 300 labor hours? e) less than 250 labor hours? f) from 300 to 350 labor hours?…
Pie charts and bar graphs are two ways of representing data in a visual format and they both have their strengths and weaknesses with regards to how data and information is displayed. I do not think either one is best. It just depends on what you want the data to depict.…
StDev for Private group (1.336) is larger than for Business group (0.941), i.e. there is more variation or less consistency in Private group.…
An ordinal scale classifies data into distinct categories in which ranking is implied. Ordinal scaling is a stronger form of measurement than nominal scaling because an observed value classified into one category possesses more of a property than does an observed value classified into another category.…
How well have stocks done over the past generation? The Standard & Poor’s 500 stock index describes the average performance of the stocks of 500 leading companies. Because each return is weighted by the total market value of each companys stock, the index emphasizes larger companies. The file ex01 57.txt contains the real (that is, adjusted for the changing buying power of the dollar) returns on the S&P 500 for the years from 1971 to 2003.…
Please note: 7th edition is available, however, we will NOT be using the 7th edition – please purchase the 6th edition…
1. A radio station that plays classical music has a “By Request” program each Saturday night. The percentage of requests for composers on a particular night are listed below:…
An alpha level of 0.05 is arbitrary and was set as a standard by scientists. One of the key concepts in hypothesis testing is that of significance level or, the alpha level, which specifies the probability level for the evidence to be an unreasonable estimate. Unreasonable means that the estimate should not have taken its particular value unless some non-chance factor(s) had operated to alter the nature of the sample such that it was no longer representative of the population of interest…
In previous sections of this chapter, we’ve discussed studying the issue, deciding on a research design, and creating an observational system for gathering information for your evaluation. Now it’s time to collect your data and analyze it – figuring out what it means – so that you can use it to draw some conclusions about your work. In this section, we’ll examine how to do just that.…