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"How do Americans feel about ads on websites? A survey of 1,000 adult Internet users found that 670 opposed ads on websites. (Data extracted from S. Clifford, "Tacked for Ads? Many Americans say "No Thanks," The New York Times, September 30, 2009, p.B3). Suppose that a survey of 1,000 Internet users age 12-17 found that 510 opposed ads on websites. At the 0.05 level of significance, is there evidence of a difference between adult Internet users and Internet users age 12-17 in the proportion who opposes ads? Solve manually and then by mega stat. Indicate your decision rule, your hypotheses and your statistical and management conclusions."
There are 4 samples of 40 individuals each interviewed to find out how often they visit a fast food restaurant in the week.
A normal population has a mean of 75 and a standard deviation of 5. You select a sample of 40. Compute the probability the sample mean is
Correlation based on Scatter Plot - Draw the scatter plot for the variables.
Recent crime reports indicate that 5.2 motor vehicle thefts occur each minute in the United States. Assume that the distribution of thefts per minute can be approximated by the Poisson probability distribution.
Do these results suggest that the racial makeup of the faculty members is different from that of the students? (Use the .05 significance level.)
For monthly volume of 300 tables, find out total cost, total revenue and profit.
Obtain a test statistic and p -value. Interpret the results at α = .01.
Let independent variable x represent years since 1950. Determine quadratic regression model for per capita cigarette consumption.
Test the mean cholesterol content in the egg is greater than 2.5 percent
Did you find any outliers on the dependent variables that were due to errors of coding? If so, what and why? How would you correct an error of coding?
Estimate with 90% confidence the difference in the level of satisfaction with service between the two branches.
Discuss the strengths and weaknesses of correlational and regression studies; discuss concepts such as positive and negative correlations, correlation coefficients, confounding, and causality.
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