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2. According to an article in the American Heart Association’s publication Circulation, 24% of patients who had been hospitalized for an acute myocardial infarction did not fill their cardiac medication by the seventh day of being discharged (Ho, Bryson &
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Question 8 pts Suppose the random variables X1 to X4 have the following means and standard deviations: H1 = 0.64, H2 = 3400 kN/m, H3 = 1 and 04 = 5.461 m 01 = 0.096,02 = 170 kN/m; 03 = 0.2, 04 = 1.081 m where U1 is the mean value for X1, 01 the standard d
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Mrs DNJ,the owner of a retail store is thinking of opening another store.she plans to base her
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what are parameters and how to identify
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The Ritz-Carlton Hotel used a customer opinion questionnaire to obtain performance data about its dining and entertainment services (The Ritz-Carlton Hotel, Naples, Florida, February 2006 ). Customers were asked to rate six factors: Welcome, Service, Food, Menu Appeal, Atmosphere, and Overall Experience. Data were recorded for each factor, with I for Fair, 2 for Average, 3 for Good, and 4 for Excellent.
a. The customer responses provided data for six variables. Are the variables categonical or quantitative?
b. What measurement scale is used?
The following data show the number of rental cars in service for three rental car companies:
Hert. Avis, and Dollar. The data are for the years $2007-2010$ and are in thousands of
vehicles (Auto Rental News website, May $15,2011 )$ .
a. Construct a time series graph for the years 2007 to 2010 showing the number of rental
cars in service for each company. Show the time series for all three companies on the
b. Comment on who appears to be the market share leader and how the market shares are
changing over time.
c. Construct a bar chart showing rental cars in service for $2010 .$ Is this chart based on
cross-sectional or time series data?
The Financial Times/Harris Poll is a monthly online poll of adults from six countries in Europe and the United States. A January poll included 1015 adults in the United States. One of the questions asked was, "How would you rate the Federal Bank in handling the credit problems in the financial markets?" Possible responses were Excellent, Good, Fair, Bad, and Terrible (Harris Interactive website, January $2008 ) .$
a. What was the sample size for this survey?
b. Are the data categorical or quantitative?
c. Would it make more sense to use averages or percentages as a summary of the data for this question?
d. Of the respondents in the United States, 10$\%$ said the Federal Bank is doing a good
job. How many individuals provided this response?
Refer to Table 1.6 .
a. What is the average miles per gallon for city driving?
b. On average, how much higher is the miles per gallon for highway driving as compared
to city driving?
c. What percentage of the cars have four-cylinder engines?
d. What percentage of the cars use regular fuel?
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Picturing Variations With Graphs
Linear Regression and Correlation
Normal, Binomial, and Geometric Models