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Which Of The Following Confidence Intervals Will Be Wider

Submitted by • November 30, 2018

Part A: Theoretical Questions (25 points) 1. Toys RUs wants to construct a confidence interval for the life of its toys. Which of the following confidence intervals will be wider: one based on a Z-distribution or one based on a t-distribution? 2. A confidence interval of 90% was used to estimate the proportion of customers who buy at least two items during their shopping mall experience. A random sample of 150 customers produced the following confidence interval: 30% +/- 4%. What is the best way to explain the results? 3. When the population standard deviation is unknown and the sample size is less than 30, what table value should be used in computing a confidence interval for a mean? a. z b. t c. Chi-square d. None of the above 4. When you should use a z test? What are the properties of a t-distribution? 5. True or false a) Rejecting the null hypothesis when it is true is called a(n) Type I error. b) An error is committed when the null hypothesis is rejected when it is false. c) When

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Voted by Simon Brooke

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