1. At Pflugerville High School, the vending machines offer four chip choices. The representative from Mars, Inc., the company that restocks the machines, thinks that students enjoy all the
chips equally. The data in the table is from the month of April. Test an appropriate hypothesis
to decide if Mars, Inc. is correct. Give statistical evidence to support your conclusion.
Chips
Frequency
Cheetos
125
Takis
203
Goldfish
112
Ruffles
116
2. Cathy wants to buy a new dishwasher for her apartment. Cathy does some research online,
She finds that the mean repair cost of 20 Whirlpool machines is $211 with a standard deviation
of $23. She finds that the mean repair cost of 29 Samsung machines is $239 with a standard
deviation of $22. Construct and interpret a 98 percent confidence interval for the difference in
mean repair costs between the Whirlpool and Samsung dishwashers,