Shopping on Black Friday. Refer to the International Journal of Retail and Distribution Management (Vol. 39, 2011) sur- vey of Black Friday shoppers, Exercise 7.22 (p. 353). One question was How many hours do you usually spend shop- ping on Black Friday? a. a. How many Black Friday shoppers should be included in a sample designed to estimate (with 95% confi- dence) the average number of hours spent shopping on Black Friday if you want the estimate to deviate no more than .5 hour from the true mean? b. Devise a sampling plan for collecting the data that will likely result in a representative sample. Shopping on Black Friday. Refer to the International Journal of Retail and Distribution Management (Vol. 39, 2011) sur- vey of Black Friday shoppers, Exercise 7.22 (p. 353). One question was How many hours do you usually spend shop- ping on Black Friday? a. a. How many Black Friday shoppers should be included in a sample designed to estimate (with 95% confi- dence) the average number of hours spent shopping on Black Friday if you want the estimate to deviate no more than .5 hour from the true mean? b. Devise a sampling plan for collecting the data that will likely result in a representative sample