The criminal justice training institute of a particular state developed a "new and improved" training course for police officers who were learning safety issues in domestic violence incidents. Sixty trainees were randomly assigned to two groups: 30 took the customary course and 30 took the new course. All 60 trainees were given the same exam to measure their skills. Skills Learned Customary Course New Course Excellent 7 13 Good 15 15 Unsatisfactory 8 2 Calculate the appropriate test statistics and df. Compare the obtained test statistic to the critical value at the .05 alpha level. Do you accept or reject the null hypothesis, explain.
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.
The criminal justice training institute of a particular state developed a "new and improved" training course for police officers who were learning safety issues in domestic violence incidents. Sixty trainees were randomly assigned to two groups: 30 took the customary course and 30 took the new course. All 60 trainees were given the same exam to measure their skills.
Skills Learned Customary Course New Course
Excellent 7 13
Good 15 15
Unsatisfactory 8 2
Calculate the appropriate test statistics and df.
Compare the obtained test statistic to the critical value at the .05 alpha level.
Do you accept or reject the null hypothesis, explain.
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