What kind of statistics test to use for each question? How to use in excel?

A. Can we conclude at the 1% significance level that the mean number of door openings and closings with hinges made from Alloy 1 is greater than 1.25 million?

B. Do the data provide enough evidence to allow us to infer at the 5% significance level that hinges made with Alloy1 last longer than hinges made with Alloy 2?

C. Estimate with 90% confidence the variance of the number of openings and closings of the hinges made from Alloy 2. Interpret the interval.

D. The quality control manager is not only concerned about the openings and closings of the hinges but is also concerned about the proportion of hinges that fail. Can we infer at the 10% significance level that the proportion of hinges made with Alloy 2 that fail exceeds 18%?