You may need to use the appropriate table in the Appendix of Tables to answer this question. A certain forum reported that in a survey of 2003 American adults, 25% said they believed in astrology. (a) Calculate a confidence interval at the 99% confidence level for the proportion of all adult Americans who believe in astrology. (Enter your answer as an interval in the form (lower bound, upper bound). There two answer blanks. For each answer, enter a number. Round your answers to three decimal places.) ( Interpret the resulting interval. O we are 99% confident that this interval contains the true population mean. O We are 99% confident that the true population mean lies below this interval. O We are 99% confident that the true population mean lies above this interval. O We are 99% confident that this interval does not contain the true population mean. (b) What sample size would be required for the width of a 99% CI to be at most 0.05 irrespective of the value of p ? (Round your answer up to the nearest integer.)

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Equations and Inequations

Equations and inequalities describe the relationship between two mathematical expressions.

Linear Functions

A linear function can just be a constant, or it can be the constant multiplied with the variable like x or y. If the variables are of the form, x2, x1/2 or y2 it is not linear. The exponent over the variables should always be 1.