1. I want to understand the impact of two activities, reading a book and exercising, on stress ratings. I have twenty undergraduate students read their favorite book for an hour, then rate their stress. Then, the same group of undergraduates exercises for an hour, then rates their stress. What test would I use to determine if activity type changes stress ratings? A. One-Sample T-Test B. Independent Groups t-test C. One-Sample Z-Test D. Correlated Groups t-test 2. A high school gifted teacher wants to know if his gifted and talented students have higher IQ scores than the population average. The population average is an IQ of 100 (σ = 15). The teacher’s class has an average IQ score of 110. What test would he use to determine if his students have significantly higher IQ’s than the population? A. One-Sample T-Test B. One-Sample Z-Test C. Correlated Groups t-test D. Independent Groups t-test 3. I want to know how drink type changes ratings of energy. I randomly assign 30 participants to three drink groups. Ten drink Sleepytime Tea, ten drink water, and ten drink a Five Hour Energy. What test would I use to determine if there are differences between drink types on ratings of energy? A. Two-Way Between Subjects ANOVA B. One-Way Between-Subjects ANOVA C. Correlated Groups t-test D. One-Way Repeated Measures ANOVA
Addition Rule of Probability
It simply refers to the likelihood of an event taking place whenever the occurrence of an event is uncertain. The probability of a single event can be calculated by dividing the number of successful trials of that event by the total number of trials.
Expected Value
When a large number of trials are performed for any random variable ‘X’, the predicted result is most likely the mean of all the outcomes for the random variable and it is known as expected value also known as expectation. The expected value, also known as the expectation, is denoted by: E(X).
Probability Distributions
Understanding probability is necessary to know the probability distributions. In statistics, probability is how the uncertainty of an event is measured. This event can be anything. The most common examples include tossing a coin, rolling a die, or choosing a card. Each of these events has multiple possibilities. Every such possibility is measured with the help of probability. To be more precise, the probability is used for calculating the occurrence of events that may or may not happen. Probability does not give sure results. Unless the probability of any event is 1, the different outcomes may or may not happen in real life, regardless of how less or how more their probability is.
Basic Probability
The simple definition of probability it is a chance of the occurrence of an event. It is defined in numerical form and the probability value is between 0 to 1. The probability value 0 indicates that there is no chance of that event occurring and the probability value 1 indicates that the event will occur. Sum of the probability value must be 1. The probability value is never a negative number. If it happens, then recheck the calculation.
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