PLZ help 1.When we have data on every element, that is called: A.Census B.Sample

Question

PLZ help

1.When we have data on every element, that is called: A.Census B.Sample C.Population

2.When we don’t have data on every element of our population, we take a sample:
A.True
B.False

3.Which of these is not a branch of statistics:
A.Descriptive statistics
B.Inferential statistics
C.Probability

4.Which of these is not an example of descriptive statistics:
A.Stem and leaf
B.Sampling
C.Histogram
D.Measures of location
E.Measures of spread

5.Which of these is not a measure of location:
A.Mean
B.Median
C.Percentile
D.Fourth spread
E.Trimmed means

6.Which of these is not a measure of variability:
A.Range
B.Variance
C.Standard deviation
D.Fourth spread
E.All are measures of variability

7.Is this the correct interpretation of probability?
Probability of 10% means 1 out of 10
A.Yes
B.No

8.Is this the correct interpretation of probability?
As n gets arbitrarily large, n(A)/n approaches a limiting value referred to as the limiting (or long-run) relative frequency of the event A
A.Yes
B.No

9.A subset of size k from n where order matters is
A.Combination
B.Permutation

10.A random variable is a rule of association that associates a numerical value to a few of the outcomes of an experiment
A.True
B.False

Explanation / Answer

All answers, with explanations as below:

1. This is a population, as we have data on every element. Answer is C.

2. False. We take a sample because getting every data points of elements in population is a non-practical, time consuming and costly process. Answer is B.

3. Probability Theory is branch of mathematics. Answer is C

4. C is correct. All others are descriptive statistics

5. Fourth spread is a measure of variability/spread. And hence is not the right answer here. D. is correct

6. A. Range is not the measure of variability

7. A. Yes is correct

8. A. Yes is correct. This is what happens when sample size increases, Any relative frequency will stabilize as no. of replications n increases

9. Where order matters, use Permutation. B. is correct

10.A. True is correct, this how we define a random variable

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