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,f(x)=6sin(x-11))+19 where f(x) represents the temperature in degrees Celsius (°C) and and x is hours since midnight. What is the temperature of your house at 9:00 a.m.?
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Explanation & Answer
Plug in 9 into f(x):
f(9) = 6*sin((9-11))+19
f(9) = 6*sin(-2)+19 = 13.54 degrees Celsius
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0.475
0.058
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0.183
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If you are asked to select a proportionate stratified sample of size 30 from the classroom, stratified by class level (senior, junior, etc.), how many students from each group will there be in the sample?
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About 3 Freshmen, about 7 Sophomores, about 15 Juniors, about 8 Seniors
About 2 Freshmen, about 5 Sophomores, about 14 Juniors, about 8 Seniors
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If you select a disproportionate sample of size 20 from the classroom, with equal numbers of students from each class level in the sample, how many freshmen will be in the sample?
5
7
9
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Smaller by a factor of 2
Larger by a factor of 2
Smaller by a factor of 4
Larger by a factor of 4
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2.5 Points
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Decreases by 1.41
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Decreases by 0.71
Increases by 0.71
Question 7
2.5 Points
When taking a random sample from a very large population, how does the standard error of the mean change when the sample size is multiplied by 4?
Decreases by a factor of 4
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68.45
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