For questions 15-17, refer to the following information: ...

For questions 15-17, refer to the following information: Thyroid-stimulating hormone (TSH) is a hormone produced by the pituitary gland in your brain. This gland tells the thyroid to produce thyroxine (T4) and then triiodothyronine (T3) which stimulates the metabolism of almost every tissue in the human body. Using a simple blood draw, information on how the thyroid is functioning can be elucidated.

TSH level 

<0.4 mU/L = Hyperthyroidism

0.4 - 4.0 mU/L = Normal

4.1 - 8.0 mU/L = Hypothyroidism

>9.0 mU/L = Extreme hypothyroidism

According to the American Thyroid Association, plasma TSH levels are normally distributed with a mean value of 3.0 mU/L and a standard deviation of 0.5 mU/L. 

Q 15

Question 15

In order to calculate the population mean, the American Thyroid Association conducted a large population based study among 10,000 people. The study includes 15 individuals who have extremely high TSH levels. Which of the following summary measures is most likely to be affected by these extreme values? (1 points)

Select one:

a. Mode

b. Median

c. Mean

d. Variance

e. Cannot be determined from the given information

Q 16

Question 16

Approximately, how many of the 10,000 people in the study are expected to have hypothyroidism (TSH level >4.0 mU/L)? (Hint: without using the z-table, recall how observations are distributed within 1, 2, and 3 standard deviations) (3 points)

Select one:

a. 100

b. 250

c. 500

d. 1000

e. 2500

Q 17

Question 17

The American Thyroid Association is considering to establish new criteria for hyperthyroidism which will constitute the bottom 2%. What is the cutoff TSH level for the proposed hyperthyroidism level? (3 points)

Select one:

a. 1.64

b. 1.98

c. 2.05

d. 3.25

e. 4.03