7 multiple choice questions on normal distribution, confidence interval, critical values, F test, statistical significance, linear regression

1. Only two doctors would make a diagnosis on patients coming into the same STD clinic for gonorrhea. The probability of the two doctors making a diagnosis of gonorrhea is (independent, dependent, synergistic, cannot tell).

2. Assume that birth weights are normally distributed with a mean of 3400g and a standard deviation of 700 g. If you want to find the probability that a birth weight will be less than or equal to 2000 g you would first normalize and set up the equation as:

3. Which confidence interval has the most variability?

a. (.0039, .0058)
b. (.009, .0058)
c. (1.20, 3.00)
d. they all have the same variability

4. A test statistic was calculated to be -1.6/ You need to determine critical values c1= t99,.025, c2=t99,975. Referring to a t table you see that 99 degrees of freedom is not in the table, but c2=t120,.975 = 1.980. You would _____ the Ho.

5. Determination of statistical significance can only be determined by calculating the exact p value and declaring results as significant. True or false?

6. You use an F test to test for unequal variances in two groups. You determine that the p value for the F test equals 0.70. You there conclude:

a. One sample has unequal variances
b. Two samples have unequal means
c. Two samples have equal variances
d. Cannot determine from information given

7. Suppose you fit a linear regression line to describe the variability of forced expiratory lung volume depending on a person's height. What statistical significance test would you use?

a. F test
b. X-Y test
c. Chi-square
d. None of the above

Attached file(s):

stats1.doc  View File