Question

13 points Previous Answers using techniques from an earlier section, we can find a confidence interval for He Consider a random confidence interval for pa is as follows 12 84 022 Notes Ask in a matched data pair. Compute the samgle mean d ot the dfferences and the sample standard deviation s hasnomal distribution er is mound-shaped, or tn 30, he or if n 2 30, then Ed E where E - c- confidence level (0 e1) te critical value for confidence level c and d.-- B: Percent increase 26 10 14 186 for company A: Percent increase 20 25 2 14-419 1S 3 (a) Using the data above, nnd a 95% certdence interval nor the mean dmerence between percentage increase in company revenue and percentage roease n ao saley. (Round pour two decimal places lower imt upper limit te (b) Use the confidence interval method of hypothesi' of signficarce ing to test the hypothesis that pepdation-perenage-erease onpany revene i' anerert 60m m"-cro wry Us. 5% we ncreases between company revenue and CEO salaries ncreases between cempany revenue and CEO salares between company revenue and CEO salanes ncreaves between cempany revenue and CEO salaries 。Snce涧d "Ofrom the mal hypothesis es not mthe 95% cedderen interval, repect MD at ehe 5%︼ofsin cene, me dat" ndeate a dnmre in pomamn mean penentage nomes _Since μσ Ofrom the mull hypothesis as the 9s% corthdence mervat, repect Mo at the 5% level of siVincance. The data do not nkate a erce in ponulaton mean penentage

Answer 1

B	A	d
26	20	6
10	25	-15
14	28	-14
18	14	4
6	-4	10
4	19	-15
21	15	6
37	30	7
	Average	-1.375
	Stdev	11.135