 # Practice Exam 1 – ISA 225

Put simply: there's three categories of problems that you need to be ready to face on your exam. Within each of those three categories, you need to be ready to apply different techniques to solve.

Each of the questions below cover all three categories & techniques! Click any of the questions below to get started!

### Category #1: Probability (p-value) of event occurring

Question #1 - Using z-score with population distribution Question #2 - Using z-score with sampling distribution Question #3 - Using t-score ### Category #2: Confidence intervals

Question #4 - One-proportion z-test Question #5 - One-mean z-test Question #6 - Two-mean t-test ## Questions

Question #1: What percentage of the population has an IQ score less than 105?

Finding p-value of z-score with population distribution

Answer: p-value = 0.6293

Question #2: What's the probability of finding a sample of 30 people will a mean IQ score of less than 105?

Finding p-value of z-score with sampling distribution

Answer: p-value = 0.9664 PAID CONTENT This is the end of the preview. To unlock the rest, get the .