Title: Quiz

Choose appropriate answers:

1. Please review the time series shown in the figure below and determine the period and frequency of the time series

Time series plot of sin function with four cycles over 400 days
This time series has period 50 days and frequency 0.02 cycles /day (1/50)
This time series has period 200 days and frequency 0.005 cycles/day (1/200)
This time series has period 100 days and frequency 0.01 cycles/day (1/100)

 

2. Figure below shows a histogram of a time series. The time series statistics are mean= 16.15, median=15.3, mode=16.2, standard deviation=5.2, skewness=0.645 , kurtosis=1.258. Choose which answer is true.

Histogram of a normally distributed variable
Probability that the variable will be within range (10.95 : 21.35) is about 33%
Probability that the variable will be within range (10.95 : 21.35) is about 67%
Probability that the variable will be within range (10.95 : 21.35) is about 99%

 

3. Climatological tercile limits of a time series shown in Table below are 5.5 and 9. What is the distribution between below, near and above normal classes for the 15 years of the time series data?

year
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
value
3
12
10
7
7.5
0
8
2
2.6
5
10
10.7
15
3.2
5
Below normal class is 5; Near normal classis 5; Above normal class is 5
Below normal class is 5; Near normal classis 7; Above normal class is 3
Below normal class is 7; Near normal classis 3; Above normal class is 5