00 w per user from Bome. 11e users yielded a sample mean of 42.1 visits with a standard deviation of 5.3. At the 0.01 level of significance, can it be concluded that this differs from the national average? Source: 20. Aver Source: New York Times Almanac. repor partic sizes 15. Cell Phone Bills The average monthly cell phone bill was reported to be $50.07 by the U.S. Wireless Industry. Random sampling of a large cell phone company found the following monthly cell phone charges (in dollars): 6 55.83 49.88 62.98 70.42 60.47 52.45 49.20 50.02 At o 58.60 51.29 the r At the 0.05 level of significance, can it be concluded that the average phone bill has increased? Sourc Source: World Almanac. 21. Doc aver 16. Teaching Assistants' Stipends A random sample of stipends of teaching assistants in economics is listed. Is there sufficient evidence at the a 0.05 level to con- clude that the average stipend differs from $15,000? The stipends listed (in dollars) are for the academic year. A re thes 14,000 18,000 12.000

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Unitary Method

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. 

Speed, Time, and Distance

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 miles away.

Profit and Loss

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

Units and Measurements

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 experiments to set up the devices.