Question

In general, how do we describe the sample standard deviation?
The sample standard deviation is a measure of spread around the midpoint.

If the mean, median and mode of a distribution are 9, 10,12 respectively, then the distribution is:
skewed negatively

A distribution of 90 student grades has a median of 68.4%. If the highest grade given to only one student was increased by 4%, the mode ________.
will not change

A researcher has collected data at the nominal level of measurement, which measure of central tendency would be best used for these data?
mode

As part of a study of the Otonabee River, groups of students collected the following data:
temperature (in °C)
rate of flow (m/s)
phosphorus concentrations (μg/L)
particle size of bank sediments (finer than 0.0098mm =clay, 0.0625mm to 0.0098mm=silt,
1.0mm to 0.0624mm=sand, 64mm to 0.9mm=gravel)
amount of suspended sediment (clear, somewhat cloudy, very cloudy)
interval, ratio, ratio, nominal, ordinal

Before conducting any statistical tests on her data, a hydrologist wanted to determine whether the data were skewed. She determined that the mean of the data was 38.75 m/s, the median was 40.42 m/s and the standard deviation was 2.75 m/s. Using Pearson's index of skewness, he concluded:
the data were significantly skewed in the negative direction

Students in BEG 2080H calculated sample variance and obtained the answer in their calculator window was: 495.6190476. The data used to calculate this value was accurate to three decimal points (e.g. 14.543). What would be the appropriate way to report the sample variance on the answer sheet?
495.6190

A Trent Biology student wanted to compare the variation between two types of adult flies, Leaf-miner flies (Lrriomyza sp) and Long-legged flies (Dolichopus finitus). He determined the smaller Leaf-miner fly had a mean mass of 154.1 mg and a standard deviation of 28.7mg, and the larger Long-legged fly had a mean mass of 185.6mg and a standard deviation of 28.5mg. Based on the coefficient of variation, which data set appeared to have greater variation?
the Leaf-miner fly exhibited greater variation

In each of the scenarios below the researcher is interested in comparing the variability of two data sets. For which scenario would the coefficient of variation be the best statistic to use?
A biologist studying Antarctic penguins wishes to compare variation in body fat (% of total weight) against height of the penguins (cm). He thinks that body fat is much more variable.

.
Which of the following would represent continuous variables and which would represent discrete variables?
The number of metals that exceed water quality health guidelines from wells sampled in Ontario.
Timespentperdayonsocialmediabystudentsduringexamweek.
People's hair colour defined by names.
The concentration of cortisol measured in blood samples.
People's hair colour defined by the concentrations of two pigments (eumelanin and pheomelanin).
2, 4, 5 continuous; 1, 3 discrete

Answer 1

Answer:

what is this yar itna bda kya he ye

Answer 2

Oh god itna lengthy