In a Z-test, the number of degrees of freedom is A none of these B 1 C) n-1 D n-2

r items 12-15, refer to the problem below: Mr. Bautista asserts that fewer than 5% of the bulbs that he sells are defective. Suppose 100 bulbs are randomly selected, each are tested, and 2 defective bulbs are found. Does this provide sufficient evidence for Mr. Bautista that the fraction of defective bulbs is less than 0.05. Use a = 0.05. 12. What is the null and alternative hypothesis in the problem? A. Ho: p = 0.05 Ha:p#0.05 B. Ho: p = 0.05 Ha:ps 0.05 C. Ho:p = 0.05 Haip 0.05 %3D %3D 13. Compute the test statistic value. A. - 2.15 B.- 2.14 C. - 1.38 D. - 1.37 14. Determine the critical value. A. - 1.96 B. 1.96 C. - 1.645 D. 1.645 15. Base on the computed test statistic value and the critical value, is Mr. Bautista correct from his assertion that fewer than 5% of the bulbs that he sells are defective? A. Yes B. No C. Undecided D. Cannot be determined

The data represent the results for a test for a certain disease. Assumeone individual from the group is randomly selected.    The individual did have          The individual did not           the disease                      have the diseasePositive     457                                 24Negative     78                                 341a. Find the probability of getting someone who tested positive,given that he or she did not have the disease. Round your answer tofour decimal places. Don’t forget to show your work.b. Find the probability of getting someone who tested negative,given that he or she did have the disease. Round your answer to fourdecimal places. Don’t forget to show your work

A с B AG BG CG DG D AB BB CB DB Blue AR BR CR DR Red A person spins both of the spinners below. (Assume they are equally sp 1. What is the sample space? AB AY BB BY CB CY DB DY 2. What is the size of the sample space? 3. What is the probability of spinning "Blue" or "C"? Yellow 4. What is the probability of spinning "Blue" and "C"? Blue Green dec