The director of a hospital wishes to estimate the mean number of admissions to the emergency room during a 24-hour period as part of their personnel planning. The director randomly selects 64 different 24-hour periods and determines the number of admissions for each. For this sample, the mean is 19.8 admissions and standard deviation is 25 admissions. Which of the following assumptions is necessary in order for a condence interval to be valid? Select one: Q The mean of the sample equals the mean of the population. 0 None of these assumptions are necessary. 0 The population sampled from has an approximatet distribution. 0 The population sampled from has an approximate normal distribution. Check