Sex and violence II In the study described in Exercise27, the researchers also contacted the subjects again,24 hours later, and asked them to recall the brandsadvertised. Results are summarized below.a) Is there a significant difference in viewers’ abilities toremember brands advertised in shows with violent vs.neutral content?b) Find a 95% confidence interval for the difference inmean number of brand names remembered betweenthe groups watching shows with sexual content andthose watching neutral shows. Interpret your intervalin this context. Program TypeViolent Sexual NeutralNo. of subjects 101 106 103Brands recalledMean 3.02 2.72 4.65SD 1.61 1.85 1.62
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.
Sex and violence II In the study described in Exercise
27, the researchers also contacted the subjects again,
24 hours later, and asked them to recall the brands
advertised. Results are summarized below.a) Is there a significant difference in viewers’ abilities to
remember brands advertised in shows with violent vs.
neutral content?
b) Find a 95% confidence interval for the difference in
mean number of brand names remembered betweenthe groups watching shows with sexual content and
those watching neutral shows. Interpret your interval
in this context.
Program Type
Violent Sexual Neutral
No. of subjects 101 106 103
Brands recalled
Mean 3.02 2.72 4.65
SD 1.61 1.85 1.62
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