Statistics - quiz 3
8
A researcher has collected the following sample data 5, 12, 6, 8, 5, 6, 7, 5, 12, 4 The 75th percentile is
7
A researcher has collected the following sample data 5, 12, 6, 8, 5, 6, 7, 5, 12, 4 The mean is
6
A researcher has collected the following sample data 5, 12, 6, 8, 5, 6, 7, 5, 12, 4 The median is
5
A researcher has collected the following sample data 5, 12, 6, 8, 5, 6, 7, 5, 12, 4 The mode is
2
A researcher has collected the following sample data. 3, 5, 12, 3, 2 The mean of the sample is 5. The interquartile range is
10
A researcher has collected the following sample data. 3, 5, 12, 3, 2 The mean of the sample is 5. The range is
4.062
A researcher has collected the following sample data. 3, 5, 12, 3, 2 The mean of the sample is 5. The standard deviation is
16.50
A researcher has collected the following sample data. 3, 5, 12, 3, 2 The mean of the sample is 5. The variance is
median
The value which has half of the observations above it and half the observations below it is called the
negative
The variance can never be
24
The variance of a sample of 169 observations equals 576. The standard deviation of the sample equals
8
The variance of a sample of 81 observations equals 64. The standard deviation of the sample equals
can never be negative
The variance of the sample
22
A group of students had dinner at a local restaurant. The total bill for the dinner was $414.70. Each student paid his/her equal share of the bill, which was $18.85. How many students were at the dinner?
correlation coefficient
A numerical measure of linear association between two variables is the
covariance
A numerical measure of linear association between two variables is the
sample statistic
A numerical value used as a summary measure for a sample, such as sample mean, is known as a
12.5
Given the following information: Standard deviation = 8 Coefficient of variation = 64% The mean would then be
is the average value of the two middle items when all items are arranged in ascending order
If a data set has an even number of observations, the median
784
If the coefficient of variation is 40% and the mean is 70, then the variance is
positive relation between the independent and the dependent variables
Positive values of covariance indicate
median
The 50th percentile is the
third quartile
The 75th percentile is referred to as the
the standard deviation divided by the mean times 100
The coefficient of variation is
cannot be larger than 1
The correlation coefficient
-1 and +1
The correlation coefficient ranges between
range
The difference between the largest and the smallest data values is the
is the same as the 25th percentile
The first quartile
40%
The heights (in inches) of 25 individuals were recorded and the following statistics were calculated mean = 70 mode = 73 median = 74 range = 20 variance = 784 The coefficient of variation equals
30.00%
The hourly wages of a sample of 130 system analysts are given below. mean = 60 mode = 73 median = 74 range = 20 variance = 324 The coefficient of variation equals
the difference between the third quartile and the first quartile
The interquartile range is
the range
The measure of dispersion that is influenced most by extreme values is
central location
The median is a measure of
50th percentile
The median of a sample will always equal the
mode
The most frequently occurring value of a data set is called the
dividing the frequency of the class by the sample size
The relative frequency of a class is computed by
4096
The standard deviation of a sample of 100 observations equals 64. The variance of the sample equals
11.25%
The weights (in pounds) of a sample of 36 individuals were recorded and the following statistics were calculated. mean = 160 mode = 165 median = 170 range = 60 variance = 324 The coefficient of variation equals
Positive
When the data are skewed to the right, the measure of Skewness will be
the trimmed mean
When the smallest and largest percentage of items are removed from a data set and the mean is computed, the mean of the remaining data is
