Sunday
May 19, 2013

# Homework Help: Statistics

Posted by Kasey on Wednesday, August 1, 2007 at 4:51pm.

I need help on this one too. Any one willing to get me started? THANKS!

Potassium is a mineral that helps the kidneys function normally. It also plays a key role in cardiac, skeletal, and smooth muscle contraction, making it an important nutrient for normal heart, digestive, and muscular function. A test for the level of potassium in the blood is not perfectly precise. Moreover, the actual level of potassium in a person’s blood varies slightly from day to day. Normal levels of potassium range from 3.7 mEq/L to 5.2 mEq/L.

(Note mEq/L represents milliequivalents per liter – which is just a type of concentration measurement.)

a) What does the phrase “statistically significant” mean? Explain.

b) If nine measurements for Jason were taken on different days with levels (mEq/L) given by 3.6, 3.7, 5.1, 5.6, 5.4, 4.7, 4.6, 3.8, and 5.2 respectively what is a 95% confidence level for his mean potassium level?

c) Do you think his potassium levels are normal? Explain.

I'll give you some hints to get started, then let you take it from there.

For part a:
Statistically significant is meant to reflect the results of a statistical test when the null hypothesis is rejected.

For parts b & c:
Find the mean and standard deviation of the measurements given. You can then use a formula to calculate the 95% confidence interval using the mean, standard deviation, and sample size.

Thanks again....it helps me sort things out. K

No one has answered this question yet.

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