A recent study asked college students in class how much they spent on the last pair of shoes they purchased. A sample of 55 students found they spent an average $74.52 with a standard deviation of $37.78 a. Predict the population mean shoe cost using a 95% confidence interval. b. How large a sample would we need to estimate the average amount spent by students on the last pair of shoes they bought to within $5 of the true population mean with 95% confidence?
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.
A recent study asked college students in class how much they spent on the last pair of shoes they purchased. A sample of 55 students found they spent an average $74.52 with a standard deviation of $37.78
a. Predict the population mean shoe cost using a 95% confidence interval.
b. How large a sample would we need to estimate the average amount spent by students on the last pair of shoes they bought to within $5 of the true population mean with 95% confidence?
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