Answer :

Choicehotels.com, Marriott.com, and Hilton.com are individual hotel chain sites for booking and information, while Trivago.com is a travel search engine for price comparison. These platforms can be used for conducting statistical analyses of hotel prices across different cities or for making informed travel bookings. Therefore, option A. Choicehotels.com is the correct answer.

When it comes to booking hotel rooms, there are several platforms one can utilize. Sites like Choicehotels.com, Marriott.com, and Hilton.com are official websites for their respective hotel chains, providing the ability to book rooms, read about hotel amenities, and check room availability directly. In contrast, Trivago.com is a travel search engine that compares prices across various hotels and booking sites, offering a broader comparison of options for travelers.

As a traveler comparing hotel prices in different cities, you would use these websites to gather information on room rates and amenities. For instance, a student assessment of hotel prices' differences across cities can be performed using these platforms, which may be an assignment point as suggested by the reference to 'testing at a 1 percent level of significance' which implies a statistical analysis of price variations.

It is important to explore each site or alternative resources thoroughly to ensure the reliability of the information, especially when conducting an academic study or making travel arrangements. Credible reviews and direct communication with the hotels can supplement the data from these online platforms. Therefore, option A. Choicehotels.com is the correct answer.