d. 0.8554
e. 0.1535
Which of the following describe/s the central limit theorem?
I. The mean of the sampling distribution of x– is the same as the mean of the population.
II. The standard deviation of the sampling distribution of x– is the same as the standard deviation
of x – divided by the square root of the sample size.
III. If the sample size is large, the shape of the sampling distribution of x – is approximately normal.
a. I only
b. I & II only
c. II only
d. III only
e. I, II, and III
If three fair coins are flipped, P (0 heads) = 0.125, P (exactly 1 head) = 0.375, P (exactly 2 heads) =
0.375, and P (exactly 3 heads) = 0.125. The following results were obtained when three coins were
flipped 64 times:
What is the value of the X 2 statistic used to test if the coins are behaving as expected, and how many
degrees of freedom does the determination of the P -value depend on?
a. 3.33, 3
b. 3.33, 4
c. 11.09, 3
d. 3.33, 2
e. 11.09, 4For the histogram pictured above, what is the class interval (boundaries) for the class that contains
the median of the data?
a. (5, 7)
b. (9, 11)