Part II: Multiple Choices (9 points).
1. The outliers mostly affect:
a) Mode
b) Median
c) IQR
d) Mean
e) All four
2. For hypothesis testing of correlation significance we use:
a) Z test
b) T test with df=n-1
c) T test with df=n-2
d) T test with df=(r-1)(c-1)
e) None of the provided answers
3. Histogram of Binomial distribution with p=0.89 and n=10 would be:
a) Skewed to the right
b) Skewed to the left
c) Symmetric
d) We cannot determine if we do not have actual data.
4. Which one is not true about standard deviation
a) Standard deviation is always greater than or equal to 0
b) Standard deviation is square root of variance
c) Standard deviation is always smaller than variance
d) Standard deviation is 1 for standard normal distribution
e) None of the provided answers
5. Given that the distribution of the STA 202 scores in a given year is right skewed with mean 65 and a standard deviation of 10.Find an interval that contains at least 89% of the scores.
a) (35,95)
b) (50,80)
c) (55,75)
d) (45,85)
e) None of above