For a population that has a normal distribution, the sampling distribution of the mean is:

Select one:

a.Unknown

b.Always normal for only small samples

c.Sometimes normal for sufficiently large sample sizes

d.Always normal

For the normal distribution, what is the probability of obtaining a value higher than the median?

Select one:

a.It depends on the value of the population variance

b.0.50

c.25%

d.Cannot be determined given the information

Which of the following is true?

Select one:

a.A confidence level of 90% implies that 90% of the data points fall within one standard deviation

b.The confidence level indicates the probability of obtaining a value between the lower and upper limit

c.A negative probability implies that the random variable is located on the far-left limit

d.A 95% confidence level means that 95% of all possible samples include the true population parameter