13. Test Scores Which is a better relative position, a score of 83 on a geography test that has a mean of 72 and a standard deviation of 6, or a score of 61 on an accounting test that has a mean of 55 and a standard deviation of 3.5?

rue or False? Assume a researcher recruits 150 African American and Caucasian individuals taking warfarin to determine if there is a difference in the mean dosage of the medication needed to cause a decrease in their INR blood test. If the mean dosage for 75 Caucasian individuals required to get their INR blood test in range is 6.1 mg with a standard deviation of 1.7 mg and the mean dosage for 75 African American individuals required to get their INR blood test in range is 4.3 mg with a standard deviation of 0.9 mg, the z value obtained while calculating the test statistic is approximately 9.60.  True  False

The first statistics exam had a mean of 73 and a standard deviation of 15 ​points; the second had a mean of 83 and a standard deviation of 5 points. Anna scored a 82 on both tests. Megan scored 92 on the first exam and 7272 on the second. They both totaled 164 points on the two​ exams, but AnnaAnna claims that her total is better. Explain.       Question content area bottom Part 1 The total of Anna's ​z-scores is enter your response here​, which is greater than Megan's total of enter your response here. ​(Round to one decimal place as​ needed.)

Ali scores 70 on Calculus-1 course with a class mean of 68 and a standard deviation of 2, and he scores 68 on Introduction to Operating with a class average of 60 and a standard deviation of 2. In which test did he perform well? Explain

I need help solving this statistics problem.

How does a nonzero constant number c change a standard deviation problem?

True or false. If the standard deviation of a dataset is 0, the mean must also be 0.

Suppose a researcher wants to test if the average diastolic blood pressure in African-Americans is different than the average diastolic blood pressure in the general population. Note that the average diastolic blood pressure in the general population is 70 mmHG. The researcher retains the null hypothesis, so she therefore concludes... Group of answer choices The mean diastolic blood pressure in African-Americans is equal to that of the general population The mean diastolic blood pressure in African-Americans is different than that of the general population

Suppose the scores of students on a Statistics course are Normally distributed with a mean of 400 and a standard deviation of 42. What percentage of the students scored between 316 and 400 on the exam? (Give your answer to 3 significant figures.) percent.

1) After 5 pts were added to every score in a sample the mean is found to be 62 and the standard deviation is 12. What were the values for the mean and SD before the change? Explain