(Shortly explain the answer please) Questions 4 A study was conducted at a local
ID: 3216648 • Letter: #
Question
(Shortly explain the answer please)
Questions 4
A study was conducted at a local school to analyze the average SAT score of students graduated from this school at 2015. 150 students, who graduated from this school in 2015, were randomly selected, and the variance of SAT scores for this group of students was calculated. The result was equal to 50.5. The value of 50.5 is
a)Parameter
b)Statistic
c)Cannot be determined
Questions 5
The restaurants ratings are usually on a scale from 1 to 10 stars. The level of these measurement is
a)Nominal
b)Interval
c)Ratio
d)Ordinal
Explanation / Answer
A parameter is a meaure that describes the entire population whereas a statistic describes a sample of the population. In this case,
Questions 4
A study was conducted at a local school to analyze the average SAT score of students graduated from this school at 2015. 150 students, who graduated from this school in 2015, were randomly selected, and the variance of SAT scores for this group of students was calculated. The result was equal to 50.5. The value of 50.5 is
A parameter is a meaure that describes the entire population whereas a statistic describes a sample of the population.
In the Question , 50.5 is the variance of the sample. This sample is taken from a population : SAT score of students graduated from this scholl in 2015
50.5 sample describes about the sample variance. Hence the value of 50.5 is statisitc.
Ans. b) Statistic
Questions 5
The restaurants ratings are usually on a scale from 1 to 10 stars. The level of these measurement is
a)Nominal
b)Interval
c)Ratio
d)Ordinal
Answer : d)ordinal
The restaurants ratings are usually on a scale from 1 to 10 stars is ordinal becasue For ordinal values the order matters but not the difference between variables.
A rating of 7 stars means better restaurant than that with s rating of 5 star, and that is better than a rating of 3 star. But the difference between the 7 star and the 5 star may not be the same as that between 5star and 3star
A interval variable is a measurement where the difference between two values is meaningful. The difference between a temperature of 100 degrees and 90 degrees is the same difference as between 90 degrees and 80 degrees
A ratio variable, has all the properties of an interval variable, and also has a clear definition of 0.0. When the variable equals 0.0, there is none of that variable. Variables like height, weight, enzyme activity are ratio variables. Temperature, expressed in F or C, is not a ratio variable. A temperature of 0.0 on either of those scales does not mean 'no heat'.
A categorical variable, also called a nominal variable, is for mutual exclusive, but not ordered, categories.
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