SOLVED:b. Define the random variable X in words. c. Define the random variable X̅ in words. d. Which distribution should you use for this problem? Explain your choice. e. Construct a 99 % confidence interval for the population mean length of time using training wheels. i. State the confidence interval. ii. Sketch the graph. f. Why would the error bound change if the confidence level were lowered to 90 % ?
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