If a hypothesis test leads to the rejection of the null hypothesis, a O Type I error has not been committed O Type I error must have been committed O Type Il error may have been committed O Type I error may have been committed

If z is a standard normal variable and the area between -z and +z is 49%. Approximately how many std deviations from the mean is represented by z? The Survey of Study Habits and Attitudes (SSHA) is a psychological test that measures the motivation, attitude, and study habits of college students. Scores range from 0 to 200 and follow (approximately) a normal distribution with mean y and standard deviation o = 26. A simple random sample of 22 college students is taken and each is given the SSHA. The mean of the 22 scores is = 114.32. Based on these data, a 71% confidence interval for u is 114.32