Explanation:(a) Was this an observational study or an experiment? Explain your reasoning. Experiment, because certain variables were controlled (he sets the screen brightness to low and then starts a movie) to determine if iPhones last longer if the screen brightness is set to low, and it proves the cause and effect relationship.
(b) What is the explanatory variable and the response variable? Response Variable- To determine if iPhones last longer if the screen brightness is set to low Explanatory variable- he sets the screen brightness of 10 of the iPhones to high and starts a movie, then the other 10 to low and starts a movie.
(c) Was a random sample used to collect the data? Yes- “he selects a random sample of 20 brand new iPhones”
Answer:
Peasants were allowed some freedom in hopes of
securing other feudal obligations.
number of different pairs the teacher can choose= nCr (18+14, 2)=496
no. of opposite gender pairs possible= 14 (since there are only 14 boys)
probability = 14/496= 7/248
Drive me home to the airport for the morning I can wait till tomorrow I’m not going anywhere else I’ll be back at work and I’ll get back with my
Stress and trauma. There are many reason why children eyewitness testimonies may not be completely accurate, one of which could be stress and trauma. When children experience a traumatic and stressful event, their ability to accurately recall the event becomes impaired.
