Confidence Intervals and Statistical Analysis

The video tutorial explains how to calculate confidence intervals for mean service times of two restaurants, X and Y, using StatCrunch. It guides through the process of selecting data, computing T statistics, and determining the lower and upper bounds of the confidence intervals. The tutorial also covers comparing the results to assess any significant differences between the two restaurants' service times.

What is the main task described in the problem involving two restaurant samples?

• Calculating the average service time

• Constructing a confidence interval

• Comparing the number of customers

• Finding the median service time

Which software tool is suggested for calculating T statistics in the video?

• StatCrunch

• Excel

• Python

• R

What type of statistics is used for one sample with data in StatCrunch?

• Z statistics

• Chi-square statistics

• T statistics

• F statistics

What confidence level is initially used for calculating the interval for Restaurant X?

• 0.90

• 0.80

• 0.95

• 0.99

What is the lower limit of the confidence interval for Restaurant X after rounding?

• 160.7

• 150.5

• 180.3

• 170.2

What is the upper limit of the confidence interval for Restaurant X after rounding?

• 185.4

• 190.5

• 196.2

• 200.1

What confidence level is used for calculating the interval for Restaurant Y?

• 0.95

• 0.99

• 0.80

• 0.90

What is the lower limit of the confidence interval for Restaurant Y after rounding?

• 160.3

• 150.2

• 140.0

• 130.5

What is the upper limit of the confidence interval for Restaurant Y after rounding?

• 180.4

• 170.1

• 167.9

• 160.5

What is the purpose of comparing the confidence intervals of the two restaurants?

• To calculate the total number of customers

• To check for a significant difference in mean times

• To find the median service time

• To determine the average service time