Activity 1: Matched pairs or independent/separate samples?
For each of the prompts below, decide whether the parameter of
interest is a mean difference (matched pairs, ) or a difference in
means (independent samples, ).
Students want to know if it matters where they have their cell
phone screen repaired. A sample of eight cell phones with broken
screens was obtained. For each phone, an estimate for the screen
repair in U.S. dollars ($) was obtained from a local store, where
the phone would be dropped off and picked up, and from an on-line
merchant, where the phone needs to be shipped to a national chain
and shipped back. Your goal is determining if, on average, the
estimate in dollars for the total repair from the on-line merchant
is more (possibly because of the added cost of shipping) than the
estimate from a local store.
Identify the: unit/case: parameter:
A study wants to determine how free Wi-Fi affects data usage on a
long-distance bus ride. A group of nine busses traveling from State
College to New York City were randomly assigned to give free Wi-Fi
to passengers and another nine busses traveling the same route were
randomly assigned to offer Wi-Fi for a one-time charge for its
passengers. The study measured the amount of data used, in
gigabytes, on each bus for the one trip to find out the average
difference in the amount of data used based on if Wi-Fi is free or
a paid service.
Identify the: unit/case parameter:
A family with two siblings, an older brother and a younger sister,
goes to Six Flags to enjoy a day of rides. After each ride, the
grandfather asks the older brother and younger sister to rate the
ride on a scale of 1 (hated it) to 5 (loved it). The grandfather, a
retired statistics professor, wants to know if the rating from the
brother is lower, on average, than the younger sister.
Identify the: unit/case parameter:
1. The parameter is the cell phone screen repaired cost.
The case is Matched pairs.
2. The parameter is the amount of data used.
The case is independent/separate samples.
3. The parameter is the rate the ride on a scale of 1 (hated it) to 5 (loved it).
The case is independent/separate samples.
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Activity 1: Matched pairs or independent/separate samples? For each of the prompts below, decide whether the...