An online retailer claims that 90% of all orders are shipped within 12 hours of being received. A consumer group placed 121 orders of different sizes and at different times of days; 102 a. Compute the...

An online retailer claims that 90% of all orders are shipped within 12 hours of
being received. A consumer group placed 121 orders of different sizes and at
different times of days; 102 orders were shipped within 12 hours.
a. Compute the sample proportion of items shipped within 12 hours.
b. Confirm that the sample is large enough to assume that the sample proportion
is normally distributed. Use p = 0.90, corresponding to the assumption that the
retailer’s claim is valid.

Extracted text: An online retailer claims that 90% of all orders are shipped within 12 hours of being received. A consumer group placed 121 orders of different sizes and at different times of days; 102 a. Compute the sample proportion of items shipped b. Confirm that the sample is large enough to assume that the sample proportion is normally distributed. Use p = 0.90, corresponding to the assumption that the retailer's claim is valid. orders were shipped within 12 hours. within 12 hours.