would it be unusual to see 10 students pass all their classes? 14. the probability that a certain machine will produce a defective item is 1/4. if a random sample of 6 items is taken from the output of this machine, what is the probability that there will be 5 or more defectives in the sample? 15. t/f a. we use the t distribution with (n-1) degrees of freedom when sigma, the population standard deviation is stated. x p(x) -3 .2 -1 .1 0 .1 1 .1 2 missing 15 b. t/f symmetric confidence intervals are used to draw conclusions about two-sided hypothesis tests.
