Description

Quiz 1 (please show your work!)

1.       (4 pts). ). In an interesting twist combining winter sport interest and fascination with very large people, 5 sumo wrestlers (average weight 350 lbs) are in town to try out for a new reality show “The Biggest Luger”. They have stopped by our class (PY620- avg weight 150 lbs). How will the addition of these 5 men change each of the following for the weight of our class:1) Mean weight, 2) Median weight, 3) Standard deviation, and 4) Skew: (Hint; no calculations are needed to answer this).

2.       (4 pts) Calculate the mean, median, mode, and standard deviation for the following set of numbers: 12,7,6,5,3,1,7.

a.       Mean=

b.      Median=

c.       Mode=

d.      Standard Deviation=

3.       (3 pts) Tom took a math test and got a score of 10. Mary took a math test in a different class and got a score of 9.  If the mean =15 and standard deviation=5 in Tom’s class and the mean =12 and standard deviation =4 in Mary’s class. Which one did better on their exam?

4.       (1 pt) The Law of Large Numbers states that:

a.       As the font of the number increases so does it’s legality.

b.      As the size of the sample increases, the mean of the sample approaches the mean of the population.

c.       The distribution of sample means approximates the normal distribution but only when the original distribution is perfectly normal.

d.      The probability of mutually exclusive events are added together.

5.       (1 pt) When a sample is negatively skewed:

a.       Extreme positive values pull the mean to the right .

b.      The distribution of values is symmetrical.

c.       Extreme negative values pull the mean to the left.

d.      The standard deviation is reduced.

6.       (1 pt) Of the following, which variable uses a nominal level of measurement.

a.       Gender.

b.      Scared questionnaire.

c.        Health (poor, fair, good, excellent).

d.      Height.

7.       (1 pt) Generally speaking, the ___________ variable measures the outcome.

a.       Dependent.

b.      Independent.

c.       Ratio scale

d.      Qualitative.