The U.S. Geological Survey compiled historical data about Old Faithful Geyser (Yellowstone National Park) from 1870 to 1987. Let x1 be a random variable that represents the time interval (in minutes) between Old Faithful eruptions for the years 1948 to 1952. Based on 8820 observations, the sample mean interval was x1 = 62.2 minutes. Let x2 be a random variable that represents the time interval in minutes between Old Faithful eruptions for the years 1983 to 1987. Based on 25,340 observations, the sample mean time interval was x2 = 72.4 minutes. Historical data suggest that o = 9.47 minutes and o2 = 11.71 minutes. Let µ1 be the population mean of x1 and let µ2 be the population mean of x2. (a) Compute a 95% confidence interval for u1 - 42. (Use 2 decimal places.) |-10.04 X -10.279 X lower limit upper limit

The word “unitary” comes from the word “unit”, which means a single and complete entity. In this method, we find the value of a unit product from the given number of products, and then we solve for the other number of products.

Imagine you and 3 of your friends are planning to go to the playground at 6 in the evening. Your house is one mile away from the playground and one of your friends named Jim must start at 5 pm to reach the playground by walk. The other two friends are 3 …

The amount earned or lost on the sale of one or more items is referred to as the profit or loss on that item.

Measurements and comparisons are the foundation of science and engineering. We, therefore, need rules that tell us how things are measured and compared. For these measurements and comparisons, we perform certain experiments, and we will need the experime…