Question

ame: Score: MATH 214 Spring 2018 uiz 4 The 2009 holiday retail season, which kicked off on November 27, 2009 (the day after Thanksgiv- ing), had been marked by somewhat lower self-reported consumer spending than was seen during the comparable period in 2008. To get an estimate of consumer spending, 436 randomly sampled American adults were surveyed. A 95% confidence interval based on this sample is ($8031389.11). Determine whether the following statements are true or false, and explain your reasoning. (5 pts each) 50 200 250 300 Spending (a) We are 95% confident that the average spending of these 436 American adults is between $80.31 and $89.11. (b)This confidence interval is not valid since the distribution of spending in the sample is right skewed.

Answer 1

(a)True (b)False Size of the sample is large, by using CLT, it is approximated to normal. (c)False (d)False za(5) Lower Confident Limitx- e)lrue ах = 84.71-4.4 - 80.31