Mathematics, 29.07.2019 18:10 DeathFightervx
Lightbulbs of a certain type are advertised as have an average lifetime of 750 hours. a random sample of 50 bulbs was selected and the lifetime of each bulb was determined. the sample mean lifetime was 738.44 hours with a standard deviation of 38.2 hours. based on this data, can you conclude that the true average lifetime of these bulbs is less than what advertised? test using = .05.
Answers: 3
Mathematics, 21.06.2019 23:30
How do you find the distance of each number from the mean
Answers: 1
Mathematics, 21.06.2019 23:50
Find the interior angle of a regular polygon which has 6 sides
Answers: 1
Mathematics, 22.06.2019 00:00
How many liters of peroxide should be added to 12 liters of an 8% peroxide solution so that the resulting solution contains 16% peroxide? original added new amount of peroxide 0.96 liters x 0.96 + x amount of solution 12 liters x 12 + x 0.18 liter 1.14 liters 1.92 liters 2.10 liters
Answers: 1
Mathematics, 22.06.2019 00:30
Abcd is reflected across the x- axis, then rotated 90 clockwise about the orgin, and finally reflected across the line y= x to form a’ b’ c’ .
Answers: 2
Lightbulbs of a certain type are advertised as have an average lifetime of 750 hours. a random sampl...
Mathematics, 03.12.2020 01:00
Mathematics, 03.12.2020 01:00
Biology, 03.12.2020 01:00
Chemistry, 03.12.2020 01:00
Mathematics, 03.12.2020 01:00
Geography, 03.12.2020 01:00
Mathematics, 03.12.2020 01:00
Spanish, 03.12.2020 01:00
Mathematics, 03.12.2020 01:00
History, 03.12.2020 01:00