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Bottles of popular cola drinks are supposed to contain 300ml of cola.
There is some variation from bottle to bottle because the filling
mackinery is not perfectly precise. the distribution fo the contents is
normal with SD=3ml. The result of the average is 299.03. Is this
convincing evidence that the mean contents of cola bottles is less than
the advertised 300ml?(Find the z)
A coin is tossed 10 times. What is the chance of observing 6
heads?
Find the area under the x^2 curve with 10 degrees of freedom
from the right of 4.86.
A die is rolled 1296 times and lands on heads 650 times. Find the
Z-value if it was expected to land on heads 600 times.
A sample of 1,000 from a university says that 59% of students live on
campus while 41% live off campus. Range from _____ to _____ is a 95%
confidence interval for the students who live off campus.
Scientist found orange juice helps reduce heart disease. People don't
drink orange juice have 80% chance of heart disease. People who drink
orange juice have 65% in a sample of 100 and SD = 4.1
Null hypothesis says orange juice doesn't help.
The ave test score of students is 60. A sample of five students has
ave test score of 75 with help of tutors. SD = 3.2
Null hypothesis : tutor doesn't help, ave score is still 60
In a sample of 40, ave age in 12th grade of school A = 17 SD =
0.2
In a sample of 20, ave age in 12 th grade of school B = 19 SD =
0.5
What is the SE for difference?
What is the SE for a box with 60 red marbles, and 90 blue ones
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