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The z distribution and statistics test scores: Imagine that your statistics professor lost all records of students' raw scores on a recent test. However, she did record students' z scores for the test, as well as the class average of 41 out of 50 points and the standard deviation of 3 points (treat these as population parameters). She informs you that your z score was 1.10.
a. What was your percentile score on this test?
b. Using what you know about z scores and percentiles, how did you do on this test?
c. What was your original test score?
If 1 millimeter equals 100 insulin units, how many milliliters should the patient have been given if she had been prescribed 36 units? show your work
The average score on the stat midterm was 75 points with a standard deviation of 5 points, and Gregor's z-score was -2. How many points did he score.
The lottery commissioner's office in a state wanted to find if the percentages of men and women who play the lottery often are different.
a group of 5 statistics students receive the following grades on a test 81 74 62 92 and 76. an intervention plan is
Given the following hypotheses: the true mean equals 100 (the null) and the true mean does not equal 100 (the alternate), a random sample of six resulted in the following values:
In a study of a proposed treatment for diabetes prevention, 339 people under the age of 20 who were thought to be at high risk
The standard for this material requires that impact strength must be greater than 1.0ft-lb/in. The sample average and standard deviation obtained were 1.25 and 0.25 respectively.
Find the probability that the number of who consider themselves basketball fans is :
For a political science class, students gathered data for a supporters profile of the two candidates for senator, Hill and Dale.
A group of researchers is interested in determining if a relationship exists between geographic area (i.e., rural, suburban, urban) and SAT math scores.
Know someone who is prone to anger? Nature has a way to calm such people: they get heart disease more often. Several observational studies have discovered.
A survey of 100 persons of voting age reveals that 60 are male, 30 of whom do not identify with a political party; 50 are members of a political party.
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