A Statistics professor has observed that for several years students score an average of 105 points out of 150 on the semester exam. A salesman suggests that he try a statistics software package that gets students more involved with computers, predicting that it will increase students' scores. The software is expensive, and the salesman offers to let the professor use it for a semester to see if the scores on the final exam increase significantly. The professor will have to pay for the software only if he chooses to continue using it. In the trial course that used this software, 213 students scored an average of 108 points on the final with a standard deviation of 8.8 points. Complete parts a) and b) below. t. rail to reject Hp. TTme change iS TIOI staisucalny signiicant. The soiLware uoes not appear iO improve exam scores. OD. Reject Ho. The change is not statistically significant. The software does not appear to improve exam scores. b) Does this improvement seem to be practically significant? Choose the correct answer below and fill in any answer boxes within your choice. (Round to one decimal place as needed.) O A. Yes. A 95% confidence interval for the mean score using the software is Students' scores improved by at least 5 points on the exam. These improvements may be worth the cost of the software. O B. No. A 95% confidence interval for the mean score using the software is Students' scores improved by no more than 5 points on the exam. This might not be enough to justify the cost. OC. No. A 95% confidence interval for the mean score using the software is The change is not statistically significant. Students' scores may not improve at all in the long run. The software is not worth the cost. Click to select and enter vour answeris)

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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.