Recall that the cigarette industry requires that models in cigarette ads must appear to be at least 25 years old. Also recall that a sample of 50 people is randomly selected at a shopping mall. Each person in the sample is shown a "typical cigarette ad" and is asked to estimate the age of the model in the ad. The sample gives a mean of 23.663 years and a standard deviation of 3.596 years. Let µ be the mean perceived age estimate for all viewers of the ad, and suppose we consider the claim that u is at least 25. Please test the claim at a=0.01. Assume population o=3.596. Please set up the hypothesis testing

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Confidence Intervals

When we calculate intervals in probability and statistics, it can be simply termed as finding out a confidence interval. The confidence interval is usually calculated from the data set which is observed. The value of the parameter that needs to be calculated is present here only.