39. Given two independent random samples with the following results: n1 = 11 X, = 174 S1 = 34 n2 = 8 X2 = = 191 S2 = 22 Use this data to find the 90% confidence interval for the true difference between the population means. Assume that the population variances are equal and that the two populations are normally distributed Step 1. Find the critical value that should be used in constructing the confidence interval. Round your answer to three decimal places. Answer: Step 2. Find the standard error of the sampling distribution to be used in constructing the confidence interval. Round your answer to the nearest whole number. Answer: Step 3. Construct the 90% confidence interval. Round your answers to the nearest whole number. Answer: Lower endpoint: Upper endpoint:

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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.