A fishing company claims that the average number of crabs caught per trap is 4, modeled by a Poisson distribution. To test , the researcher rejects if .
Loading subject…
A fishing company claims that the average number of crabs caught per trap is 4, modeled by a Poisson distribution. To test , the researcher rejects if .
A supermarket claims that of customers use a loyalty card. A survey of 150 customers finds that 36 use the card. Use a significance level of .
A factory produces batteries with a claimed mean lifespan of 200 hours and a standard deviation of 20 hours. A sample of 50 batteries is tested at the significance level to determine whether the mean lifespan is less than 200 hours.
A factory seals tea in foil sachets. The mass of tea in a sachet has population mean g and variance . Independent random samples of size are taken.
The quality team suspects underfilling and tests against at a significance level of using a sample of 64 sachets.
Each of 8 microchips selected from a batch either passes a stress test or fails it independently. A supplier claims that the probability a microchip passes is 0.75. An engineer suspects this probability is lower and rejects the claim if fewer than five microchips pass.
Practice IB Mathematics Applications & Interpretation (AI) Topic AHL 4.18—T and Z Test, Type I and II Errors with authentic exam-style questions for both SL and HL students. This question bank focuses on the exact syllabus content for AHL 4.18—T and Z Test, Type I and II Errors and mirrors Paper 1, 2, 3 style where relevant.
Get instant solutions, detailed explanations, and build confidence with questions aligned to IB examiner expectations.
the p-value for the test.
If the true proportion is , find the probability of a Type II error.
If the true mean is 190 hours, find the probability of a Type II error.
the Central Limit Theorem for the sample mean of a random sample of size drawn from a population with mean and variance .
Suppose the true probability that a microchip passes the stress test is 0.5. the probability of committing a Type II error.