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21?% of college students say they use credit cards because of the rewards program. You randomly select 10 college students and ask each to name the reason he or she uses credit cards. Find the probability that the number of college students who say they use credit cards because of the rewards program is? (a) exactly? two, (b) more than?two, and? (c) between two and five inclusive. If? convenient, use technology to find the probabilities.
Find the sample size n, and hence the sample mean ¯X . Use this information to calculate a 95% confidence interval for the average number of credit cards carried by students.
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Draw the graph of the regression line on the same plot as the scatter diagram above.
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