Mathematics, 10.09.2019 19:30, Gabby2581
It is well-known that lack of sleep impairs concentration and alertness, and this might be due partly to late night food consumption. a 2015 study1 took 44 people aged 21 to 50 and gave them unlimited access to food and drink during the day, but allowed them only 4 hours of sleep per night for three consecutive nights. on the fourth night, all participants again had to stay up until 4 am, but this time participants were randomized into two groups; one group was only given access to water from 10 pm until their bedtime at 4 am while the other group still had unlimited access to food and drink for all hours. the group forced to fast from 10 pm on performed significantly better on tests of reaction time and had fewer attention lapses than the group with access to late night food.
(a) is the explanatory variable categorical or quantitative?
categorical
quantitative
(b) are the response variables categorical or quantitative?
categorical
quantitative
(c) is this an observational study or a randomized experiment?
observational study
experiment
(d) can we conclude that eating late at night worsens some of the typical effects of sleep deprivation (reaction time and attention lapses)?
(e) are there likely to be confounding variables?
Answers: 1
Mathematics, 21.06.2019 20:00, oopsorry
James is playing his favorite game at the arcade. after playing the game 3 times, he has 8 tokens remaining. he initially had 20 tokens, and the game costs the same number of tokens each time. the number t of tokens james has is a function of g, the number of games he plays. write the functionβs formula? t=
Answers: 1
Mathematics, 21.06.2019 21:30, cocoj3205
Amir wants to proportionally increase the size of a photo to create a poster for his room. the size of the original photo is shown. complete the statement and then answer the question to represent ways that amir can increase the size of his photo.
Answers: 2
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