Question

Question 17 (1 point) It is reported in USA Today that the average flight cost nationwide is $472.49. You have never paid close to that amount and you want to perform a hypothesis test that the true average is actually less than $472.49. The hypotheses for this situation are as follows: Null Hypothesis: u 2 472.49, Alternative Hypothesis: u < 472.49. If the true average flight cost nationwide is $589.77 and the null hypothesis is rejected, did a type I, type II, or no error occur? O 1) Type 1 Error has occurred. 2) No error has occurred. 3) Type II Error has occurred 4) We do not know the degrees of freedom, so we cannot determine if an error has occurred. 5) We do not know the p-value, so we cannot determine if an error has occurred.

Answer 1

(17) Option 1): Type I Error has occurred.

>> When we reject a true null hypothesis, we commit a type I error and we fail to reject a false null hypothesis, we commit a type II error. Since, The null hypothesis is true here and we reject this true null hypothesis, we commit a type I error.

(3) mean, u = 53470.11 , sample size, n= 67 Standard deviation, o = 5531.93 For a p-value of 0.59 (from left), the corresponding z-value is equal to -0.2275 Let, x be the required value that 59% of the lifetime is greater than X miles for 67 samplen. Now, z = xu han → X= 4+ z = 53470.11 – 0.2275 5531.93 - = 53316.35 ~ 53316.33) ► option (1)