1) ADHD or Just Young? Were you one of the youngest or one of the oldest in your class in elementary school? A new study examines whether the youngest children in a school grade are more likely to be diagnosed with attention-deficit/hyperactivity disorder (ADHD) than their older peers in the same grade. The study involved almost a million children between the ages of 6 and 12 in British Columbia, Canada. The cutoff date for entering school in Canada is December 31, so those born in January are the oldest in any given class and those born in December are the youngest. The table below shows the number of boys diagnosed with ADHD based on the quarter of the year in which they were born. The table also shows the proportion of all births during that quarter. Is it possible that younger students are being over-diagnosed with ADHD? Perform the appropriate x? test. State your parameters of interest, show your expected counts, your null and alternative hypotheses, your test statistic x? , and your p-value. Then write an appropriate conclusion. Birth Date Proportion of Births ADHD Diagnoses 6880 7982 Jan - Mar Apr- Jun Jul - Sep Oct - Dec 0.244 0.258 9161 0.257 8945 0.241

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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.