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Let's look at Europe. Refer to the previous exercise. Figure 4.10 gives a scatterplot for the same data for the 48 European countries in the data set. Compare this figure with Figure 4.9, which plots the data for all 181 countries in the data set. Write a paragraph summarizing the relationship between life expectancy and Internet use for European countries with an emphasis on how the European countries compare with the entire set of 181 countries.
(a) Describe the relationship between these two variables.(b) A friend looks at this plot and concludes that using the Internet will increase the length of your life. Write a short paragraph explaining why the association seen in the scatterplot does not provide a reason to draw this conclusion.
The total losses, say X, divided by the total premiums, say T. The bonus equals (0.5 - L)(T/30) if L
A department store has determined that 25% of all their sales are credit sales. A random sample of 60 sales is selected. (Please show full steps and excel formulas) a) What is the sampling distribution of?
A sample of 93 IQ scores was randomly selected from a certain population. At the 0.03 level of significance, test the hypothesis that the population has a mean IQ of 105.
The number of hours per week American adults spend on home computers is normally distributed with a mean of 4 hours and a standard deviation of 1.5 hour. An American adult is randomly selected.
Recent actual and forecasted data for product XYZ is given in the following table.
Review Magnusson's web blog found in the Learning Resources to further your visualization and understanding of statistical power and significance testing. Review the American Statistical Association's press release and consider the misconceptions ..
Microwaves on sale. The prices of new gadgets often start high and then fall rapidly. The first home microwave oven cost $1300 in 1955.
Suppose a random sample of 20 tax returns from small business is examined. What is the binomial probability that at least one tax return involves fraud?
From an inventory of 48 cars being shipped to local automobile makers, 12 have defective radios installed. What is the probability that one particular dealership receiving 8 cars will find 2 radios being defective? Make assumptions if necessary.
does the order in which wine is presented make a difference? subjects were asked to taste two different win samples in
what is the probability that the next subgroup average will fall outside the control limits? On average, how many subgroups will have to be looked at in order to detect this shift?
Is there any evidence to suggest that the proportion of Americans affected by the sequester changed? Use a = 0.05.- Find the p value associated with this hypothesis test.
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