A random sample of 36 seventh grade students in Harvard are
given a test on a...
A random sample of 36 seventh grade students in Harvard are
given a test on a reading test. Below are their raw scores.
73, 77, 80, 80, 84, 86, 91, 93, 93, 93, 94, 97, 100, 100, 103,
103, 104, 105, 105, 106, 108, 110, 111, 117. 120, 120, 123, 124,
126, 128, 129, 129, 130, 130, 136
Sample mean = 105.97
Sample standard deviation = 17.18
Nationally 30% of the students score 110 points or higher on
this test....
In a recent year, grade 6 Michigan State public school students
taking a mathematics assessment test...
In a recent year, grade 6 Michigan State public school students
taking a mathematics assessment test had a mean score of 303.1 with
a standard deviation of 36. Possible test scores could range from 0
to 1000. Assume that the scores were normally distributed.
a. Find the probability that a student had a score higher than
295.
b. Find the probability that a student had a score between 230
and 305.
c. What is the highest score that would still...
A researcher is studying the relationship between thyroid
hormone levels and smoking. A sample of 100...
A researcher is studying the relationship between thyroid
hormone levels and smoking. A sample of 100 nonsmokers had a mean
hormone level of 120ng/dl with a standard deviation 40ng/dl, while
a sample of smokers had a mean hormone level of 110ng/dl with a
standard deviation 35ng/dl. A randomly selected individual from the
nonsmoking group had a hormone level of 126, while a randomly
selected individual from the smoking group had a hormone level of
115. Find the corresponding z-scores. Which...