4: A researcher is testing how effective a new drug is at improving cognitive skills. A sample of n= 16 participants is obtained, and they are administered the drug. They are then tested on a cognitive task. For the general population (with no drug) the average score on this task is u = 50 with o = normal, and they predict that the drug will increase scores on the cognitive task in the population and set their alpha at a = .05. 10. The distribution is Draw the distribution of sample means where Ho is true and indicate where the critical value is, and whethe it is a z-score or a t-statistic:
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.
Number 4
Here, population standard deviation σ is known. Hence it is appropriate to use z-score.
Using Excel formula “=NORM.S.INV(1-(0.05/2))”, the critical value for α = 0.05 is obtained as 1.96.
The distribution of sample means is
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