In: Statistics and Probability
According to the University of Nevada Center for Logistics Management, 6% of all merchandise sold in the United States gets returned. A Houston department store sampled 80 items sold in January and found that 10 of the items were returned.
a. Construct a point estimate of the proportion of items returned for the population of sales transactions at the Houston store.
10/80 = .125
b. Construct a 90% confidence interval for the proportion of returns at the Houston store.
????,???? (to 4 decimals)
c. Is the proportion of returns at the Houston store significantly different from the returns for the nation as a whole? Provide statistical support for your answer.
H0: p0 = 0.06
Ha: P0? 0.06
Z- Value = ?????
P-Value = ?????