Mathematics, 01.10.2019 09:00, slaybyely
Alma wants to prove to her parents that listening to music while she studies for her tests will her get better grades. she decides to ask 15 of her friends if they listen to music while they study for tests and what their grades are. she finds that her friends who have high grades also listen to music while they study for tests. she tells her parents that she has proven that listening to music while studying for tests will cause her grades to improve. what mistake has alma made?
a) she did not separate her friends into different groups, and she didn't apply a treatment.
b) she did not separate her friends into different groups, and she used a survey to collect data.
c) she did not use a random sample, and she tried to show cause and effect with an experiment.
d) she did not use a random sample, and she tried to show cause and effect with an observational study.
Answers: 1
Mathematics, 21.06.2019 15:00, ejcastilllo
Let the mean of the population be 38 instances of from 6" - 9" hatchings per nest, and let the standard deviation of the mean be 3. what sample mean would have a confidence level of 95% or a 2.5% margin of error?
Answers: 1
Mathematics, 21.06.2019 17:00, Damani14
According to modern science, earth is about 4.5 billion years old and written human history extends back about 10,000 years. suppose the entire history of earth is represented with a 10-meter-long timeline, with the birth of earth on one end and today at the other end.
Answers: 2
Mathematics, 21.06.2019 22:00, kiiya33
Select the correct answer from each drop-down menu. consider the following polynomials equations. 3x^2(x-1) and -3x^3+ 4x^2-2x+1 perform each operation and determine if the result is a polynomial. is the result of a + b a polynomial? yes or no is the result of a - b a polynomial? yes or no is the result of a · b a polynomial? yes or no
Answers: 1
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