Question 11 Which of the following statements are true about random sampling: O four tosses of an unbiased coin is an example of random sampling from a Binomial random variable with probability of success -0.5 and a sample size of 4 O random sampling selects every piece of data in the entire population at least once O none of the other answers are correct O four tosses of an unbiased coin is an example of random sampling from a Bernoulli random variable with probability of success -0.5 Question 12 1 pts 1 pts Which of the following is true about the probability density function (pdf) of a continuous random variable? The area underneath it must be positive and strictly less than one cdf(y)-cdf(x) represents the probability the random variable is less than y but greater than or equal to x. You may assume y>x and cdf stands for the cumulative density function, O You have to be careful to note the '=' part of any inequalities when working out probabilities O It can never be higher than one, because probabilities are never higher than one