In a random sample of 80 teenagers, the average number of texts handled in a day is 50. The 96% confidence interval for the mean number of texts handled by teens daily is given as 46 to 54. a) Find the value of standard deviation that was used to calculate this CI. b) If the number of participants per sample were doubled, by what factor would the confidence interval change (that is, keeping the same confidence level)

Match the vocabulary to the proper definition. in probability, two events in which 1. conditional probability the outcome of one event is independent of the outcome of a second event. 2. dependent events in probability, two events in which the outcome of one event is dependent on the outcome of a second event. the probability of an event in which the outcome of the event is conditional on the outcome of one or more different events. 3. independent events