A certain virus infects one in every 200 people. A test used to detect the virus in a person is positive 90% of the time when the person has the virus and 5% of the time when the person does not have the virus. Let A be the person infected and B be the person tests positive.  a- using Bayes Theorem when a person tests positive determine the probabilty the person is infected.  b- using Bayes Theorem when a person tests negative determine the probability the person is not infected.

The degrees of freedom (df) for the One Sample t test and the Independent Sample t test are _________.   a. One Sample t test: N-1 Independent Samples t test: N-1   b. One Sample t test: N Independent Samples t test: N-1   c. One Sample t test: N-1 Independent Samples t test: N-2   d. One Sample t test: N-2 Independent Samples t test: N-1

Employee Absences A store manager wishes to see if the number of absences of her employees is the same for each weekday. She selected a random week and finds the following number of absences. At α=0.10, is there a difference in the number of absences for each day of the week? Use the critical-value method with tables. Day Absences Mon 12 Tues 9 Weds 17 Thurs 22 Fri 20       Identify the claim with the correct hypothesis.   H0: Employee absences are equally distributed over the five-day workweek. ▼(Choose one) H1: Employee absences are not equally distributed over the five-day workweek. ▼(Choose one)       Find the critical value. Round the answer to at least three decimal places.   The critical value is    . Compute the test value. Round the intermediate and final answer to at least three decimal places. χ2 =   Make the decision.   ▼(Choose one) the null…

An experimental design for a paired t test has 28 pairs of identical twins. How many degrees of freedom are there in this t test? There are degrees of freedom. (simplify your answer)