You can upgrade lighting at your factory to led bulbs that cost $6.95 each and last an average of 5 years. it costs s3 in labor to change a bulb. over a 10-year period. about how much will it cost per year to install led bulbs in 100 lamps and change the bulbs when they burn out?

Astudy was interested in determining if eating milk chocolate lowered someone's cholesterol levels. ten people's cholesterol was measured. then, each of these individuals were told to eat 100g of milk chocolate every day and to eat as they normally did. after two weeks, their cholesterol levels were measured again. is there evidence to support that their cholesterol levels went down? how should we write the alternative hypothesis? (mud = the population mean difference= before - after)a. ha: mud = 0b. ha: mud > 0c. ha: mud < 0d. ha: mud does not equal 0