0 Question 30 v > El' 1 pt '0 1 Food inspectors inspect samples of food products to see if they are safe. This can be thought of as a hypothesis test with the following hypotheses. H0: the food is safe Ha: the food is not safe The following is an example of what type of error? The sample suggests that the food is safe, but it actually is not safe. 0 type | 0 type II O not an error 0 Question 28 v > B 1 pt '0 1 8 99 G Details A political candidate has asked you to conduct a poll to determine what percentage of people support her. If the candidate only wants a 10% margin of error at a 99% confidence level, what size of sample is needed? When finding the z-value, round it to four decimal places. Hint: Video L7' [+] Submit Question 0 Question 20 v ' > B 4 pts '0 1 Z 99 (D Details On a planet far far away from Earth, IQ of the ruling species is normally distributed with a mean of 100 and a standard deviation of 18. Suppose one individual is randomly chosen. Let X = IQ of an individual. a. What is the distribution of X? X - N(:],[:]) b. Find the probability that a randomly selected person's IQ is over 112. C] Round your answer to 4 decimal places. c. A school offers special services for all children in the bottom 5% for IQ scores. What is the highest IQ score a child can have and still receive special services? SRound your answer to 2 decimal places. d. Find the Inter Quartile Range (IQR) for IQ scores. Round your answers to 2 decimal places. Q1: C] I:] IQR: Hint: Helpful videos: - Find a Probability @ [+] - Finding a Value Given a Probability @ [+] Hint ' Submit Question 0 Question 19 v > Please show your answer to 2 decimal places. About E96 of the area under the curve of the standard normal distribution (1; = 0 and a = 1) is outside the interval Z = (-1.4,1.4) (or beyond 1.4 standard deviations of the mean}. Submit